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/**
* To use the HTTP server and client one must `require('node:http')`.
*
* The HTTP interfaces in Node.js are designed to support many features
* of the protocol which have been traditionally difficult to use.
* In particular, large, possibly chunk-encoded, messages. The interface is
* careful to never buffer entire requests or responses, so the
* user is able to stream data.
*
* HTTP message headers are represented by an object like this:
*
* ```json
* { "content-length": "123",
* "content-type": "text/plain",
* "connection": "keep-alive",
* "host": "example.com",
* "accept": "*" }
* ```
*
* Keys are lowercased. Values are not modified.
*
* In order to support the full spectrum of possible HTTP applications, the Node.js
* HTTP API is very low-level. It deals with stream handling and message
* parsing only. It parses a message into headers and body but it does not
* parse the actual headers or the body.
*
* See `message.headers` for details on how duplicate headers are handled.
*
* The raw headers as they were received are retained in the `rawHeaders` property, which is an array of `[key, value, key2, value2, ...]`. For
* example, the previous message header object might have a `rawHeaders` list like the following:
*
* ```js
* [ 'ConTent-Length', '123456',
* 'content-LENGTH', '123',
* 'content-type', 'text/plain',
* 'CONNECTION', 'keep-alive',
* 'Host', 'example.com',
* 'accepT', '*' ]
* ```
* @see [source](https://github.com/nodejs/node/blob/v20.13.1/lib/http.js)
*/
declare module "http" {
import * as stream from "node:stream";
import { URL } from "node:url";
import { LookupOptions } from "node:dns";
import { EventEmitter } from "node:events";
import { LookupFunction, Server as NetServer, Socket, TcpSocketConnectOpts } from "node:net";
// incoming headers will never contain number
interface IncomingHttpHeaders extends NodeJS.Dict<string | string[]> {
accept?: string | undefined;
"accept-language"?: string | undefined;
"accept-patch"?: string | undefined;
"accept-ranges"?: string | undefined;
"access-control-allow-credentials"?: string | undefined;
"access-control-allow-headers"?: string | undefined;
"access-control-allow-methods"?: string | undefined;
"access-control-allow-origin"?: string | undefined;
"access-control-expose-headers"?: string | undefined;
"access-control-max-age"?: string | undefined;
"access-control-request-headers"?: string | undefined;
"access-control-request-method"?: string | undefined;
age?: string | undefined;
allow?: string | undefined;
"alt-svc"?: string | undefined;
authorization?: string | undefined;
"cache-control"?: string | undefined;
connection?: string | undefined;
"content-disposition"?: string | undefined;
"content-encoding"?: string | undefined;
"content-language"?: string | undefined;
"content-length"?: string | undefined;
"content-location"?: string | undefined;
"content-range"?: string | undefined;
"content-type"?: string | undefined;
cookie?: string | undefined;
date?: string | undefined;
etag?: string | undefined;
expect?: string | undefined;
expires?: string | undefined;
forwarded?: string | undefined;
from?: string | undefined;
host?: string | undefined;
"if-match"?: string | undefined;
"if-modified-since"?: string | undefined;
"if-none-match"?: string | undefined;
"if-unmodified-since"?: string | undefined;
"last-modified"?: string | undefined;
location?: string | undefined;
origin?: string | undefined;
pragma?: string | undefined;
"proxy-authenticate"?: string | undefined;
"proxy-authorization"?: string | undefined;
"public-key-pins"?: string | undefined;
range?: string | undefined;
referer?: string | undefined;
"retry-after"?: string | undefined;
"sec-websocket-accept"?: string | undefined;
"sec-websocket-extensions"?: string | undefined;
"sec-websocket-key"?: string | undefined;
"sec-websocket-protocol"?: string | undefined;
"sec-websocket-version"?: string | undefined;
"set-cookie"?: string[] | undefined;
"strict-transport-security"?: string | undefined;
tk?: string | undefined;
trailer?: string | undefined;
"transfer-encoding"?: string | undefined;
upgrade?: string | undefined;
"user-agent"?: string | undefined;
vary?: string | undefined;
via?: string | undefined;
warning?: string | undefined;
"www-authenticate"?: string | undefined;
}
// outgoing headers allows numbers (as they are converted internally to strings)
type OutgoingHttpHeader = number | string | string[];
interface OutgoingHttpHeaders extends NodeJS.Dict<OutgoingHttpHeader> {
accept?: string | string[] | undefined;
"accept-charset"?: string | string[] | undefined;
"accept-encoding"?: string | string[] | undefined;
"accept-language"?: string | string[] | undefined;
"accept-ranges"?: string | undefined;
"access-control-allow-credentials"?: string | undefined;
"access-control-allow-headers"?: string | undefined;
"access-control-allow-methods"?: string | undefined;
"access-control-allow-origin"?: string | undefined;
"access-control-expose-headers"?: string | undefined;
"access-control-max-age"?: string | undefined;
"access-control-request-headers"?: string | undefined;
"access-control-request-method"?: string | undefined;
age?: string | undefined;
allow?: string | undefined;
authorization?: string | undefined;
"cache-control"?: string | undefined;
"cdn-cache-control"?: string | undefined;
connection?: string | string[] | undefined;
"content-disposition"?: string | undefined;
"content-encoding"?: string | undefined;
"content-language"?: string | undefined;
"content-length"?: string | number | undefined;
"content-location"?: string | undefined;
"content-range"?: string | undefined;
"content-security-policy"?: string | undefined;
"content-security-policy-report-only"?: string | undefined;
cookie?: string | string[] | undefined;
dav?: string | string[] | undefined;
dnt?: string | undefined;
date?: string | undefined;
etag?: string | undefined;
expect?: string | undefined;
expires?: string | undefined;
forwarded?: string | undefined;
from?: string | undefined;
host?: string | undefined;
"if-match"?: string | undefined;
"if-modified-since"?: string | undefined;
"if-none-match"?: string | undefined;
"if-range"?: string | undefined;
"if-unmodified-since"?: string | undefined;
"last-modified"?: string | undefined;
link?: string | string[] | undefined;
location?: string | undefined;
"max-forwards"?: string | undefined;
origin?: string | undefined;
prgama?: string | string[] | undefined;
"proxy-authenticate"?: string | string[] | undefined;
"proxy-authorization"?: string | undefined;
"public-key-pins"?: string | undefined;
"public-key-pins-report-only"?: string | undefined;
range?: string | undefined;
referer?: string | undefined;
"referrer-policy"?: string | undefined;
refresh?: string | undefined;
"retry-after"?: string | undefined;
"sec-websocket-accept"?: string | undefined;
"sec-websocket-extensions"?: string | string[] | undefined;
"sec-websocket-key"?: string | undefined;
"sec-websocket-protocol"?: string | string[] | undefined;
"sec-websocket-version"?: string | undefined;
server?: string | undefined;
"set-cookie"?: string | string[] | undefined;
"strict-transport-security"?: string | undefined;
te?: string | undefined;
trailer?: string | undefined;
"transfer-encoding"?: string | undefined;
"user-agent"?: string | undefined;
upgrade?: string | undefined;
"upgrade-insecure-requests"?: string | undefined;
vary?: string | undefined;
via?: string | string[] | undefined;
warning?: string | undefined;
"www-authenticate"?: string | string[] | undefined;
"x-content-type-options"?: string | undefined;
"x-dns-prefetch-control"?: string | undefined;
"x-frame-options"?: string | undefined;
"x-xss-protection"?: string | undefined;
}
interface ClientRequestArgs {
_defaultAgent?: Agent | undefined;
agent?: Agent | boolean | undefined;
auth?: string | null | undefined;
createConnection?:
| ((
options: ClientRequestArgs,
oncreate: (err: Error | null, socket: stream.Duplex) => void,
) => stream.Duplex | null | undefined)
| undefined;
defaultPort?: number | string | undefined;
family?: number | undefined;
headers?: OutgoingHttpHeaders | undefined;
hints?: LookupOptions["hints"];
host?: string | null | undefined;
hostname?: string | null | undefined;
insecureHTTPParser?: boolean | undefined;
localAddress?: string | undefined;
localPort?: number | undefined;
lookup?: LookupFunction | undefined;
/**
* @default 16384
*/
maxHeaderSize?: number | undefined;
method?: string | undefined;
path?: string | null | undefined;
port?: number | string | null | undefined;
protocol?: string | null | undefined;
setHost?: boolean | undefined;
signal?: AbortSignal | undefined;
socketPath?: string | undefined;
timeout?: number | undefined;
uniqueHeaders?: Array<string | string[]> | undefined;
joinDuplicateHeaders?: boolean;
}
interface ServerOptions<
Request extends typeof IncomingMessage = typeof IncomingMessage,
Response extends typeof ServerResponse = typeof ServerResponse,
> {
/**
* Specifies the `IncomingMessage` class to be used. Useful for extending the original `IncomingMessage`.
*/
IncomingMessage?: Request | undefined;
/**
* Specifies the `ServerResponse` class to be used. Useful for extending the original `ServerResponse`.
*/
ServerResponse?: Response | undefined;
/**
* Sets the timeout value in milliseconds for receiving the entire request from the client.
* @see Server.requestTimeout for more information.
* @default 300000
* @since v18.0.0
*/
requestTimeout?: number | undefined;
/**
* It joins the field line values of multiple headers in a request with `, ` instead of discarding the duplicates.
* @default false
* @since v18.14.0
*/
joinDuplicateHeaders?: boolean;
/**
* The number of milliseconds of inactivity a server needs to wait for additional incoming data,
* after it has finished writing the last response, before a socket will be destroyed.
* @see Server.keepAliveTimeout for more information.
* @default 5000
* @since v18.0.0
*/
keepAliveTimeout?: number | undefined;
/**
* Sets the interval value in milliseconds to check for request and headers timeout in incomplete requests.
* @default 30000
*/
connectionsCheckingInterval?: number | undefined;
/**
* Optionally overrides all `socket`s' `readableHighWaterMark` and `writableHighWaterMark`.
* This affects `highWaterMark` property of both `IncomingMessage` and `ServerResponse`.
* Default: @see stream.getDefaultHighWaterMark().
* @since v20.1.0
*/
highWaterMark?: number | undefined;
/**
* Use an insecure HTTP parser that accepts invalid HTTP headers when `true`.
* Using the insecure parser should be avoided.
* See --insecure-http-parser for more information.
* @default false
*/
insecureHTTPParser?: boolean | undefined;
/**
* Optionally overrides the value of `--max-http-header-size` for requests received by
* this server, i.e. the maximum length of request headers in bytes.
* @default 16384
* @since v13.3.0
*/
maxHeaderSize?: number | undefined;
/**
* If set to `true`, it disables the use of Nagle's algorithm immediately after a new incoming connection is received.
* @default true
* @since v16.5.0
*/
noDelay?: boolean | undefined;
/**
* If set to `true`, it enables keep-alive functionality on the socket immediately after a new incoming connection is received,
* similarly on what is done in `socket.setKeepAlive([enable][, initialDelay])`.
* @default false
* @since v16.5.0
*/
keepAlive?: boolean | undefined;
/**
* If set to a positive number, it sets the initial delay before the first keepalive probe is sent on an idle socket.
* @default 0
* @since v16.5.0
*/
keepAliveInitialDelay?: number | undefined;
/**
* A list of response headers that should be sent only once.
* If the header's value is an array, the items will be joined using `; `.
*/
uniqueHeaders?: Array<string | string[]> | undefined;
}
type RequestListener<
Request extends typeof IncomingMessage = typeof IncomingMessage,
Response extends typeof ServerResponse = typeof ServerResponse,
> = (req: InstanceType<Request>, res: InstanceType<Response> & { req: InstanceType<Request> }) => void;
/**
* @since v0.1.17
*/
class Server<
Request extends typeof IncomingMessage = typeof IncomingMessage,
Response extends typeof ServerResponse = typeof ServerResponse,
> extends NetServer {
constructor(requestListener?: RequestListener<Request, Response>);
constructor(options: ServerOptions<Request, Response>, requestListener?: RequestListener<Request, Response>);
/**
* Sets the timeout value for sockets, and emits a `'timeout'` event on
* the Server object, passing the socket as an argument, if a timeout
* occurs.
*
* If there is a `'timeout'` event listener on the Server object, then it
* will be called with the timed-out socket as an argument.
*
* By default, the Server does not timeout sockets. However, if a callback
* is assigned to the Server's `'timeout'` event, timeouts must be handled
* explicitly.
* @since v0.9.12
* @param [msecs=0 (no timeout)]
*/
setTimeout(msecs?: number, callback?: () => void): this;
setTimeout(callback: () => void): this;
/**
* Limits maximum incoming headers count. If set to 0, no limit will be applied.
* @since v0.7.0
*/
maxHeadersCount: number | null;
/**
* The maximum number of requests socket can handle
* before closing keep alive connection.
*
* A value of `0` will disable the limit.
*
* When the limit is reached it will set the `Connection` header value to `close`,
* but will not actually close the connection, subsequent requests sent
* after the limit is reached will get `503 Service Unavailable` as a response.
* @since v16.10.0
*/
maxRequestsPerSocket: number | null;
/**
* The number of milliseconds of inactivity before a socket is presumed
* to have timed out.
*
* A value of `0` will disable the timeout behavior on incoming connections.
*
* The socket timeout logic is set up on connection, so changing this
* value only affects new connections to the server, not any existing connections.
* @since v0.9.12
*/
timeout: number;
/**
* Limit the amount of time the parser will wait to receive the complete HTTP
* headers.
*
* If the timeout expires, the server responds with status 408 without
* forwarding the request to the request listener and then closes the connection.
*
* It must be set to a non-zero value (e.g. 120 seconds) to protect against
* potential Denial-of-Service attacks in case the server is deployed without a
* reverse proxy in front.
* @since v11.3.0, v10.14.0
*/
headersTimeout: number;
/**
* The number of milliseconds of inactivity a server needs to wait for additional
* incoming data, after it has finished writing the last response, before a socket
* will be destroyed. If the server receives new data before the keep-alive
* timeout has fired, it will reset the regular inactivity timeout, i.e., `server.timeout`.
*
* A value of `0` will disable the keep-alive timeout behavior on incoming
* connections.
* A value of `0` makes the http server behave similarly to Node.js versions prior
* to 8.0.0, which did not have a keep-alive timeout.
*
* The socket timeout logic is set up on connection, so changing this value only
* affects new connections to the server, not any existing connections.
* @since v8.0.0
*/
keepAliveTimeout: number;
/**
* Sets the timeout value in milliseconds for receiving the entire request from
* the client.
*
* If the timeout expires, the server responds with status 408 without
* forwarding the request to the request listener and then closes the connection.
*
* It must be set to a non-zero value (e.g. 120 seconds) to protect against
* potential Denial-of-Service attacks in case the server is deployed without a
* reverse proxy in front.
* @since v14.11.0
*/
requestTimeout: number;
/**
* Closes all connections connected to this server.
* @since v18.2.0
*/
closeAllConnections(): void;
/**
* Closes all connections connected to this server which are not sending a request
* or waiting for a response.
* @since v18.2.0
*/
closeIdleConnections(): void;
addListener(event: string, listener: (...args: any[]) => void): this;
addListener(event: "close", listener: () => void): this;
addListener(event: "connection", listener: (socket: Socket) => void): this;
addListener(event: "error", listener: (err: Error) => void): this;
addListener(event: "listening", listener: () => void): this;
addListener(event: "checkContinue", listener: RequestListener<Request, Response>): this;
addListener(event: "checkExpectation", listener: RequestListener<Request, Response>): this;
addListener(event: "clientError", listener: (err: Error, socket: stream.Duplex) => void): this;
addListener(
event: "connect",
listener: (req: InstanceType<Request>, socket: stream.Duplex, head: Buffer) => void,
): this;
addListener(event: "dropRequest", listener: (req: InstanceType<Request>, socket: stream.Duplex) => void): this;
addListener(event: "request", listener: RequestListener<Request, Response>): this;
addListener(
event: "upgrade",
listener: (req: InstanceType<Request>, socket: stream.Duplex, head: Buffer) => void,
): this;
emit(event: string, ...args: any[]): boolean;
emit(event: "close"): boolean;
emit(event: "connection", socket: Socket): boolean;
emit(event: "error", err: Error): boolean;
emit(event: "listening"): boolean;
emit(
event: "checkContinue",
req: InstanceType<Request>,
res: InstanceType<Response> & { req: InstanceType<Request> },
): boolean;
emit(
event: "checkExpectation",
req: InstanceType<Request>,
res: InstanceType<Response> & { req: InstanceType<Request> },
): boolean;
emit(event: "clientError", err: Error, socket: stream.Duplex): boolean;
emit(event: "connect", req: InstanceType<Request>, socket: stream.Duplex, head: Buffer): boolean;
emit(event: "dropRequest", req: InstanceType<Request>, socket: stream.Duplex): boolean;
emit(
event: "request",
req: InstanceType<Request>,
res: InstanceType<Response> & { req: InstanceType<Request> },
): boolean;
emit(event: "upgrade", req: InstanceType<Request>, socket: stream.Duplex, head: Buffer): boolean;
on(event: string, listener: (...args: any[]) => void): this;
on(event: "close", listener: () => void): this;
on(event: "connection", listener: (socket: Socket) => void): this;
on(event: "error", listener: (err: Error) => void): this;
on(event: "listening", listener: () => void): this;
on(event: "checkContinue", listener: RequestListener<Request, Response>): this;
on(event: "checkExpectation", listener: RequestListener<Request, Response>): this;
on(event: "clientError", listener: (err: Error, socket: stream.Duplex) => void): this;
on(event: "connect", listener: (req: InstanceType<Request>, socket: stream.Duplex, head: Buffer) => void): this;
on(event: "dropRequest", listener: (req: InstanceType<Request>, socket: stream.Duplex) => void): this;
on(event: "request", listener: RequestListener<Request, Response>): this;
on(event: "upgrade", listener: (req: InstanceType<Request>, socket: stream.Duplex, head: Buffer) => void): this;
once(event: string, listener: (...args: any[]) => void): this;
once(event: "close", listener: () => void): this;
once(event: "connection", listener: (socket: Socket) => void): this;
once(event: "error", listener: (err: Error) => void): this;
once(event: "listening", listener: () => void): this;
once(event: "checkContinue", listener: RequestListener<Request, Response>): this;
once(event: "checkExpectation", listener: RequestListener<Request, Response>): this;
once(event: "clientError", listener: (err: Error, socket: stream.Duplex) => void): this;
once(
event: "connect",
listener: (req: InstanceType<Request>, socket: stream.Duplex, head: Buffer) => void,
): this;
once(event: "dropRequest", listener: (req: InstanceType<Request>, socket: stream.Duplex) => void): this;
once(event: "request", listener: RequestListener<Request, Response>): this;
once(
event: "upgrade",
listener: (req: InstanceType<Request>, socket: stream.Duplex, head: Buffer) => void,
): this;
prependListener(event: string, listener: (...args: any[]) => void): this;
prependListener(event: "close", listener: () => void): this;
prependListener(event: "connection", listener: (socket: Socket) => void): this;
prependListener(event: "error", listener: (err: Error) => void): this;
prependListener(event: "listening", listener: () => void): this;
prependListener(event: "checkContinue", listener: RequestListener<Request, Response>): this;
prependListener(event: "checkExpectation", listener: RequestListener<Request, Response>): this;
prependListener(event: "clientError", listener: (err: Error, socket: stream.Duplex) => void): this;
prependListener(
event: "connect",
listener: (req: InstanceType<Request>, socket: stream.Duplex, head: Buffer) => void,
): this;
prependListener(
event: "dropRequest",
listener: (req: InstanceType<Request>, socket: stream.Duplex) => void,
): this;
prependListener(event: "request", listener: RequestListener<Request, Response>): this;
prependListener(
event: "upgrade",
listener: (req: InstanceType<Request>, socket: stream.Duplex, head: Buffer) => void,
): this;
prependOnceListener(event: string, listener: (...args: any[]) => void): this;
prependOnceListener(event: "close", listener: () => void): this;
prependOnceListener(event: "connection", listener: (socket: Socket) => void): this;
prependOnceListener(event: "error", listener: (err: Error) => void): this;
prependOnceListener(event: "listening", listener: () => void): this;
prependOnceListener(event: "checkContinue", listener: RequestListener<Request, Response>): this;
prependOnceListener(event: "checkExpectation", listener: RequestListener<Request, Response>): this;
prependOnceListener(event: "clientError", listener: (err: Error, socket: stream.Duplex) => void): this;
prependOnceListener(
event: "connect",
listener: (req: InstanceType<Request>, socket: stream.Duplex, head: Buffer) => void,
): this;
prependOnceListener(
event: "dropRequest",
listener: (req: InstanceType<Request>, socket: stream.Duplex) => void,
): this;
prependOnceListener(event: "request", listener: RequestListener<Request, Response>): this;
prependOnceListener(
event: "upgrade",
listener: (req: InstanceType<Request>, socket: stream.Duplex, head: Buffer) => void,
): this;
}
/**
* This class serves as the parent class of {@link ClientRequest} and {@link ServerResponse}. It is an abstract outgoing message from
* the perspective of the participants of an HTTP transaction.
* @since v0.1.17
*/
class OutgoingMessage<Request extends IncomingMessage = IncomingMessage> extends stream.Writable {
readonly req: Request;
chunkedEncoding: boolean;
shouldKeepAlive: boolean;
useChunkedEncodingByDefault: boolean;
sendDate: boolean;
/**
* @deprecated Use `writableEnded` instead.
*/
finished: boolean;
/**
* Read-only. `true` if the headers were sent, otherwise `false`.
* @since v0.9.3
*/
readonly headersSent: boolean;
/**
* Alias of `outgoingMessage.socket`.
* @since v0.3.0
* @deprecated Since v15.12.0,v14.17.1 - Use `socket` instead.
*/
readonly connection: Socket | null;
/**
* Reference to the underlying socket. Usually, users will not want to access
* this property.
*
* After calling `outgoingMessage.end()`, this property will be nulled.
* @since v0.3.0
*/
readonly socket: Socket | null;
constructor();
/**
* Once a socket is associated with the message and is connected, `socket.setTimeout()` will be called with `msecs` as the first parameter.
* @since v0.9.12
* @param callback Optional function to be called when a timeout occurs. Same as binding to the `timeout` event.
*/
setTimeout(msecs: number, callback?: () => void): this;
/**
* Sets a single header value. If the header already exists in the to-be-sent
* headers, its value will be replaced. Use an array of strings to send multiple
* headers with the same name.
* @since v0.4.0
* @param name Header name
* @param value Header value
*/
setHeader(name: string, value: number | string | readonly string[]): this;
/**
* Append a single header value to the header object.
*
* If the value is an array, this is equivalent to calling this method multiple
* times.
*
* If there were no previous values for the header, this is equivalent to calling `outgoingMessage.setHeader(name, value)`.
*
* Depending of the value of `options.uniqueHeaders` when the client request or the
* server were created, this will end up in the header being sent multiple times or
* a single time with values joined using `; `.
* @since v18.3.0, v16.17.0
* @param name Header name
* @param value Header value
*/
appendHeader(name: string, value: string | readonly string[]): this;
/**
* Gets the value of the HTTP header with the given name. If that header is not
* set, the returned value will be `undefined`.
* @since v0.4.0
* @param name Name of header
*/
getHeader(name: string): number | string | string[] | undefined;
/**
* Returns a shallow copy of the current outgoing headers. Since a shallow
* copy is used, array values may be mutated without additional calls to
* various header-related HTTP module methods. The keys of the returned
* object are the header names and the values are the respective header
* values. All header names are lowercase.
*
* The object returned by the `outgoingMessage.getHeaders()` method does
* not prototypically inherit from the JavaScript `Object`. This means that
* typical `Object` methods such as `obj.toString()`, `obj.hasOwnProperty()`,
* and others are not defined and will not work.
*
* ```js
* outgoingMessage.setHeader('Foo', 'bar');
* outgoingMessage.setHeader('Set-Cookie', ['foo=bar', 'bar=baz']);
*
* const headers = outgoingMessage.getHeaders();
* // headers === { foo: 'bar', 'set-cookie': ['foo=bar', 'bar=baz'] }
* ```
* @since v7.7.0
*/
getHeaders(): OutgoingHttpHeaders;
/**
* Returns an array containing the unique names of the current outgoing headers.
* All names are lowercase.
* @since v7.7.0
*/
getHeaderNames(): string[];
/**
* Returns `true` if the header identified by `name` is currently set in the
* outgoing headers. The header name is case-insensitive.
*
* ```js
* const hasContentType = outgoingMessage.hasHeader('content-type');
* ```
* @since v7.7.0
*/
hasHeader(name: string): boolean;
/**
* Removes a header that is queued for implicit sending.
*
* ```js
* outgoingMessage.removeHeader('Content-Encoding');
* ```
* @since v0.4.0
* @param name Header name
*/
removeHeader(name: string): void;
/**
* Adds HTTP trailers (headers but at the end of the message) to the message.
*
* Trailers will **only** be emitted if the message is chunked encoded. If not,
* the trailers will be silently discarded.
*
* HTTP requires the `Trailer` header to be sent to emit trailers,
* with a list of header field names in its value, e.g.
*
* ```js
* message.writeHead(200, { 'Content-Type': 'text/plain',
* 'Trailer': 'Content-MD5' });
* message.write(fileData);
* message.addTrailers({ 'Content-MD5': '7895bf4b8828b55ceaf47747b4bca667' });
* message.end();
* ```
*
* Attempting to set a header field name or value that contains invalid characters
* will result in a `TypeError` being thrown.
* @since v0.3.0
*/
addTrailers(headers: OutgoingHttpHeaders | ReadonlyArray<[string, string]>): void;
/**
* Flushes the message headers.
*
* For efficiency reason, Node.js normally buffers the message headers
* until `outgoingMessage.end()` is called or the first chunk of message data
* is written. It then tries to pack the headers and data into a single TCP
* packet.
*
* It is usually desired (it saves a TCP round-trip), but not when the first
* data is not sent until possibly much later. `outgoingMessage.flushHeaders()` bypasses the optimization and kickstarts the message.
* @since v1.6.0
*/
flushHeaders(): void;
}
/**
* This object is created internally by an HTTP server, not by the user. It is
* passed as the second parameter to the `'request'` event.
* @since v0.1.17
*/
class ServerResponse<Request extends IncomingMessage = IncomingMessage> extends OutgoingMessage<Request> {
/**
* When using implicit headers (not calling `response.writeHead()` explicitly),
* this property controls the status code that will be sent to the client when
* the headers get flushed.
*
* ```js
* response.statusCode = 404;
* ```
*
* After response header was sent to the client, this property indicates the
* status code which was sent out.
* @since v0.4.0
*/
statusCode: number;
/**
* When using implicit headers (not calling `response.writeHead()` explicitly),
* this property controls the status message that will be sent to the client when
* the headers get flushed. If this is left as `undefined` then the standard
* message for the status code will be used.
*
* ```js
* response.statusMessage = 'Not found';
* ```
*
* After response header was sent to the client, this property indicates the
* status message which was sent out.
* @since v0.11.8
*/
statusMessage: string;
/**
* If set to `true`, Node.js will check whether the `Content-Length` header value and the size of the body, in bytes, are equal.
* Mismatching the `Content-Length` header value will result
* in an `Error` being thrown, identified by `code:``'ERR_HTTP_CONTENT_LENGTH_MISMATCH'`.
* @since v18.10.0, v16.18.0
*/
strictContentLength: boolean;
constructor(req: Request);
assignSocket(socket: Socket): void;
detachSocket(socket: Socket): void;
/**
* Sends an HTTP/1.1 100 Continue message to the client, indicating that
* the request body should be sent. See the `'checkContinue'` event on `Server`.
* @since v0.3.0
*/
writeContinue(callback?: () => void): void;
/**
* Sends an HTTP/1.1 103 Early Hints message to the client with a Link header,
* indicating that the user agent can preload/preconnect the linked resources.
* The `hints` is an object containing the values of headers to be sent with
* early hints message. The optional `callback` argument will be called when
* the response message has been written.
*
* **Example**
*
* ```js
* const earlyHintsLink = '</styles.css>; rel=preload; as=style';
* response.writeEarlyHints({
* 'link': earlyHintsLink,
* });
*
* const earlyHintsLinks = [
* '</styles.css>; rel=preload; as=style',
* '</scripts.js>; rel=preload; as=script',
* ];
* response.writeEarlyHints({
* 'link': earlyHintsLinks,
* 'x-trace-id': 'id for diagnostics',
* });
*
* const earlyHintsCallback = () => console.log('early hints message sent');
* response.writeEarlyHints({
* 'link': earlyHintsLinks,
* }, earlyHintsCallback);
* ```
* @since v18.11.0
* @param hints An object containing the values of headers
* @param callback Will be called when the response message has been written
*/
writeEarlyHints(hints: Record<string, string | string[]>, callback?: () => void): void;
/**
* Sends a response header to the request. The status code is a 3-digit HTTP
* status code, like `404`. The last argument, `headers`, are the response headers.
* Optionally one can give a human-readable `statusMessage` as the second
* argument.
*
* `headers` may be an `Array` where the keys and values are in the same list.
* It is _not_ a list of tuples. So, the even-numbered offsets are key values,
* and the odd-numbered offsets are the associated values. The array is in the same
* format as `request.rawHeaders`.
*
* Returns a reference to the `ServerResponse`, so that calls can be chained.
*
* ```js
* const body = 'hello world';
* response
* .writeHead(200, {
* 'Content-Length': Buffer.byteLength(body),
* 'Content-Type': 'text/plain',
* })
* .end(body);
* ```
*
* This method must only be called once on a message and it must
* be called before `response.end()` is called.
*
* If `response.write()` or `response.end()` are called before calling
* this, the implicit/mutable headers will be calculated and call this function.
*
* When headers have been set with `response.setHeader()`, they will be merged
* with any headers passed to `response.writeHead()`, with the headers passed
* to `response.writeHead()` given precedence.
*
* If this method is called and `response.setHeader()` has not been called,
* it will directly write the supplied header values onto the network channel
* without caching internally, and the `response.getHeader()` on the header
* will not yield the expected result. If progressive population of headers is
* desired with potential future retrieval and modification, use `response.setHeader()` instead.
*
* ```js
* // Returns content-type = text/plain
* const server = http.createServer((req, res) => {
* res.setHeader('Content-Type', 'text/html');
* res.setHeader('X-Foo', 'bar');
* res.writeHead(200, { 'Content-Type': 'text/plain' });
* res.end('ok');
* });
* ```
*
* `Content-Length` is read in bytes, not characters. Use `Buffer.byteLength()` to determine the length of the body in bytes. Node.js
* will check whether `Content-Length` and the length of the body which has
* been transmitted are equal or not.
*
* Attempting to set a header field name or value that contains invalid characters
* will result in a \[`Error`\]\[\] being thrown.
* @since v0.1.30
*/
writeHead(
statusCode: number,
statusMessage?: string,
headers?: OutgoingHttpHeaders | OutgoingHttpHeader[],
): this;
writeHead(statusCode: number, headers?: OutgoingHttpHeaders | OutgoingHttpHeader[]): this;
/**
* Sends a HTTP/1.1 102 Processing message to the client, indicating that
* the request body should be sent.
* @since v10.0.0
*/
writeProcessing(): void;
}
interface InformationEvent {
statusCode: number;
statusMessage: string;
httpVersion: string;
httpVersionMajor: number;
httpVersionMinor: number;
headers: IncomingHttpHeaders;
rawHeaders: string[];
}
/**
* This object is created internally and returned from {@link request}. It
* represents an _in-progress_ request whose header has already been queued. The
* header is still mutable using the `setHeader(name, value)`, `getHeader(name)`, `removeHeader(name)` API. The actual header will
* be sent along with the first data chunk or when calling `request.end()`.
*
* To get the response, add a listener for `'response'` to the request object. `'response'` will be emitted from the request object when the response
* headers have been received. The `'response'` event is executed with one
* argument which is an instance of {@link IncomingMessage}.
*
* During the `'response'` event, one can add listeners to the
* response object; particularly to listen for the `'data'` event.
*
* If no `'response'` handler is added, then the response will be
* entirely discarded. However, if a `'response'` event handler is added,
* then the data from the response object **must** be consumed, either by
* calling `response.read()` whenever there is a `'readable'` event, or
* by adding a `'data'` handler, or by calling the `.resume()` method.
* Until the data is consumed, the `'end'` event will not fire. Also, until
* the data is read it will consume memory that can eventually lead to a
* 'process out of memory' error.
*
* For backward compatibility, `res` will only emit `'error'` if there is an `'error'` listener registered.
*
* Set `Content-Length` header to limit the response body size.
* If `response.strictContentLength` is set to `true`, mismatching the `Content-Length` header value will result in an `Error` being thrown,
* identified by `code:``'ERR_HTTP_CONTENT_LENGTH_MISMATCH'`.
*
* `Content-Length` value should be in bytes, not characters. Use `Buffer.byteLength()` to determine the length of the body in bytes.
* @since v0.1.17
*/
class ClientRequest extends OutgoingMessage {
/**
* The `request.aborted` property will be `true` if the request has
* been aborted.
* @since v0.11.14
* @deprecated Since v17.0.0, v16.12.0 - Check `destroyed` instead.
*/
aborted: boolean;
/**
* The request host.
* @since v14.5.0, v12.19.0
*/
host: string;
/**
* The request protocol.
* @since v14.5.0, v12.19.0
*/
protocol: string;
/**
* When sending request through a keep-alive enabled agent, the underlying socket
* might be reused. But if server closes connection at unfortunate time, client
* may run into a 'ECONNRESET' error.
*
* ```js
* import http from 'node:http';
*
* // Server has a 5 seconds keep-alive timeout by default
* http
* .createServer((req, res) => {
* res.write('hello\n');
* res.end();
* })
* .listen(3000);
*
* setInterval(() => {
* // Adapting a keep-alive agent
* http.get('http://localhost:3000', { agent }, (res) => {
* res.on('data', (data) => {
* // Do nothing
* });
* });
* }, 5000); // Sending request on 5s interval so it's easy to hit idle timeout
* ```
*
* By marking a request whether it reused socket or not, we can do
* automatic error retry base on it.
*
* ```js
* import http from 'node:http';
* const agent = new http.Agent({ keepAlive: true });
*
* function retriableRequest() {
* const req = http
* .get('http://localhost:3000', { agent }, (res) => {
* // ...
* })
* .on('error', (err) => {
* // Check if retry is needed
* if (req.reusedSocket && err.code === 'ECONNRESET') {
* retriableRequest();
* }
* });
* }
*
* retriableRequest();
* ```
* @since v13.0.0, v12.16.0
*/
reusedSocket: boolean;
/**
* Limits maximum response headers count. If set to 0, no limit will be applied.
*/
maxHeadersCount: number;
constructor(url: string | URL | ClientRequestArgs, cb?: (res: IncomingMessage) => void);
/**
* The request method.
* @since v0.1.97
*/
method: string;
/**
* The request path.
* @since v0.4.0
*/
path: string;
/**
* Marks the request as aborting. Calling this will cause remaining data
* in the response to be dropped and the socket to be destroyed.
* @since v0.3.8
* @deprecated Since v14.1.0,v13.14.0 - Use `destroy` instead.
*/
abort(): void;
onSocket(socket: Socket): void;
/**
* Once a socket is assigned to this request and is connected `socket.setTimeout()` will be called.
* @since v0.5.9
* @param timeout Milliseconds before a request times out.
* @param callback Optional function to be called when a timeout occurs. Same as binding to the `'timeout'` event.
*/
setTimeout(timeout: number, callback?: () => void): this;
/**
* Once a socket is assigned to this request and is connected `socket.setNoDelay()` will be called.
* @since v0.5.9
*/
setNoDelay(noDelay?: boolean): void;
/**
* Once a socket is assigned to this request and is connected `socket.setKeepAlive()` will be called.
* @since v0.5.9
*/
setSocketKeepAlive(enable?: boolean, initialDelay?: number): void;
/**
* Returns an array containing the unique names of the current outgoing raw
* headers. Header names are returned with their exact casing being set.
*
* ```js
* request.setHeader('Foo', 'bar');
* request.setHeader('Set-Cookie', ['foo=bar', 'bar=baz']);
*
* const headerNames = request.getRawHeaderNames();
* // headerNames === ['Foo', 'Set-Cookie']
* ```
* @since v15.13.0, v14.17.0
*/
getRawHeaderNames(): string[];
/**
* @deprecated
*/
addListener(event: "abort", listener: () => void): this;
addListener(
event: "connect",
listener: (response: IncomingMessage, socket: Socket, head: Buffer) => void,
): this;
addListener(event: "continue", listener: () => void): this;
addListener(event: "information", listener: (info: InformationEvent) => void): this;
addListener(event: "response", listener: (response: IncomingMessage) => void): this;
addListener(event: "socket", listener: (socket: Socket) => void): this;
addListener(event: "timeout", listener: () => void): this;
addListener(
event: "upgrade",
listener: (response: IncomingMessage, socket: Socket, head: Buffer) => void,
): this;
addListener(event: "close", listener: () => void): this;
addListener(event: "drain", listener: () => void): this;
addListener(event: "error", listener: (err: Error) => void): this;
addListener(event: "finish", listener: () => void): this;
addListener(event: "pipe", listener: (src: stream.Readable) => void): this;
addListener(event: "unpipe", listener: (src: stream.Readable) => void): this;
addListener(event: string | symbol, listener: (...args: any[]) => void): this;
/**
* @deprecated
*/
on(event: "abort", listener: () => void): this;
on(event: "connect", listener: (response: IncomingMessage, socket: Socket, head: Buffer) => void): this;
on(event: "continue", listener: () => void): this;
on(event: "information", listener: (info: InformationEvent) => void): this;
on(event: "response", listener: (response: IncomingMessage) => void): this;
on(event: "socket", listener: (socket: Socket) => void): this;
on(event: "timeout", listener: () => void): this;
on(event: "upgrade", listener: (response: IncomingMessage, socket: Socket, head: Buffer) => void): this;
on(event: "close", listener: () => void): this;
on(event: "drain", listener: () => void): this;
on(event: "error", listener: (err: Error) => void): this;
on(event: "finish", listener: () => void): this;
on(event: "pipe", listener: (src: stream.Readable) => void): this;
on(event: "unpipe", listener: (src: stream.Readable) => void): this;
on(event: string | symbol, listener: (...args: any[]) => void): this;
/**
* @deprecated
*/
once(event: "abort", listener: () => void): this;
once(event: "connect", listener: (response: IncomingMessage, socket: Socket, head: Buffer) => void): this;
once(event: "continue", listener: () => void): this;
once(event: "information", listener: (info: InformationEvent) => void): this;
once(event: "response", listener: (response: IncomingMessage) => void): this;
once(event: "socket", listener: (socket: Socket) => void): this;
once(event: "timeout", listener: () => void): this;
once(event: "upgrade", listener: (response: IncomingMessage, socket: Socket, head: Buffer) => void): this;
once(event: "close", listener: () => void): this;
once(event: "drain", listener: () => void): this;
once(event: "error", listener: (err: Error) => void): this;
once(event: "finish", listener: () => void): this;
once(event: "pipe", listener: (src: stream.Readable) => void): this;
once(event: "unpipe", listener: (src: stream.Readable) => void): this;
once(event: string | symbol, listener: (...args: any[]) => void): this;
/**
* @deprecated
*/
prependListener(event: "abort", listener: () => void): this;
prependListener(
event: "connect",
listener: (response: IncomingMessage, socket: Socket, head: Buffer) => void,
): this;
prependListener(event: "continue", listener: () => void): this;
prependListener(event: "information", listener: (info: InformationEvent) => void): this;
prependListener(event: "response", listener: (response: IncomingMessage) => void): this;
prependListener(event: "socket", listener: (socket: Socket) => void): this;
prependListener(event: "timeout", listener: () => void): this;
prependListener(
event: "upgrade",
listener: (response: IncomingMessage, socket: Socket, head: Buffer) => void,
): this;
prependListener(event: "close", listener: () => void): this;
prependListener(event: "drain", listener: () => void): this;
prependListener(event: "error", listener: (err: Error) => void): this;
prependListener(event: "finish", listener: () => void): this;
prependListener(event: "pipe", listener: (src: stream.Readable) => void): this;
prependListener(event: "unpipe", listener: (src: stream.Readable) => void): this;
prependListener(event: string | symbol, listener: (...args: any[]) => void): this;
/**
* @deprecated
*/
prependOnceListener(event: "abort", listener: () => void): this;
prependOnceListener(
event: "connect",
listener: (response: IncomingMessage, socket: Socket, head: Buffer) => void,
): this;
prependOnceListener(event: "continue", listener: () => void): this;
prependOnceListener(event: "information", listener: (info: InformationEvent) => void): this;
prependOnceListener(event: "response", listener: (response: IncomingMessage) => void): this;
prependOnceListener(event: "socket", listener: (socket: Socket) => void): this;
prependOnceListener(event: "timeout", listener: () => void): this;
prependOnceListener(
event: "upgrade",
listener: (response: IncomingMessage, socket: Socket, head: Buffer) => void,
): this;
prependOnceListener(event: "close", listener: () => void): this;
prependOnceListener(event: "drain", listener: () => void): this;
prependOnceListener(event: "error", listener: (err: Error) => void): this;
prependOnceListener(event: "finish", listener: () => void): this;
prependOnceListener(event: "pipe", listener: (src: stream.Readable) => void): this;
prependOnceListener(event: "unpipe", listener: (src: stream.Readable) => void): this;
prependOnceListener(event: string | symbol, listener: (...args: any[]) => void): this;
}
/**
* An `IncomingMessage` object is created by {@link Server} or {@link ClientRequest} and passed as the first argument to the `'request'` and `'response'` event respectively. It may be used to
* access response
* status, headers, and data.
*
* Different from its `socket` value which is a subclass of `stream.Duplex`, the `IncomingMessage` itself extends `stream.Readable` and is created separately to
* parse and emit the incoming HTTP headers and payload, as the underlying socket
* may be reused multiple times in case of keep-alive.
* @since v0.1.17
*/
class IncomingMessage extends stream.Readable {
constructor(socket: Socket);
/**
* The `message.aborted` property will be `true` if the request has
* been aborted.
* @since v10.1.0
* @deprecated Since v17.0.0,v16.12.0 - Check `message.destroyed` from <a href="stream.html#class-streamreadable" class="type">stream.Readable</a>.
*/
aborted: boolean;
/**
* In case of server request, the HTTP version sent by the client. In the case of
* client response, the HTTP version of the connected-to server.
* Probably either `'1.1'` or `'1.0'`.
*
* Also `message.httpVersionMajor` is the first integer and `message.httpVersionMinor` is the second.
* @since v0.1.1
*/
httpVersion: string;
httpVersionMajor: number;
httpVersionMinor: number;
/**
* The `message.complete` property will be `true` if a complete HTTP message has
* been received and successfully parsed.
*
* This property is particularly useful as a means of determining if a client or
* server fully transmitted a message before a connection was terminated:
*
* ```js
* const req = http.request({
* host: '127.0.0.1',
* port: 8080,
* method: 'POST',
* }, (res) => {
* res.resume();
* res.on('end', () => {
* if (!res.complete)
* console.error(
* 'The connection was terminated while the message was still being sent');
* });
* });
* ```
* @since v0.3.0
*/
complete: boolean;
/**
* Alias for `message.socket`.
* @since v0.1.90
* @deprecated Since v16.0.0 - Use `socket`.
*/
connection: Socket;
/**
* The `net.Socket` object associated with the connection.
*
* With HTTPS support, use `request.socket.getPeerCertificate()` to obtain the
* client's authentication details.
*
* This property is guaranteed to be an instance of the `net.Socket` class,
* a subclass of `stream.Duplex`, unless the user specified a socket
* type other than `net.Socket` or internally nulled.
* @since v0.3.0
*/
socket: Socket;
/**
* The request/response headers object.
*
* Key-value pairs of header names and values. Header names are lower-cased.
*
* ```js
* // Prints something like:
* //
* // { 'user-agent': 'curl/7.22.0',
* // host: '127.0.0.1:8000',
* // accept: '*' }
* console.log(request.headers);
* ```
*
* Duplicates in raw headers are handled in the following ways, depending on the
* header name:
*
* * Duplicates of `age`, `authorization`, `content-length`, `content-type`, `etag`, `expires`, `from`, `host`, `if-modified-since`, `if-unmodified-since`, `last-modified`, `location`,
* `max-forwards`, `proxy-authorization`, `referer`, `retry-after`, `server`, or `user-agent` are discarded.
* To allow duplicate values of the headers listed above to be joined,
* use the option `joinDuplicateHeaders` in {@link request} and {@link createServer}. See RFC 9110 Section 5.3 for more
* information.
* * `set-cookie` is always an array. Duplicates are added to the array.
* * For duplicate `cookie` headers, the values are joined together with `; `.
* * For all other headers, the values are joined together with `, `.
* @since v0.1.5
*/
headers: IncomingHttpHeaders;
/**
* Similar to `message.headers`, but there is no join logic and the values are
* always arrays of strings, even for headers received just once.
*
* ```js
* // Prints something like:
* //
* // { 'user-agent': ['curl/7.22.0'],
* // host: ['127.0.0.1:8000'],
* // accept: ['*'] }
* console.log(request.headersDistinct);
* ```
* @since v18.3.0, v16.17.0
*/
headersDistinct: NodeJS.Dict<string[]>;
/**
* The raw request/response headers list exactly as they were received.
*
* The keys and values are in the same list. It is _not_ a
* list of tuples. So, the even-numbered offsets are key values, and the
* odd-numbered offsets are the associated values.
*
* Header names are not lowercased, and duplicates are not merged.
*
* ```js
* // Prints something like:
* //
* // [ 'user-agent',
* // 'this is invalid because there can be only one',
* // 'User-Agent',
* // 'curl/7.22.0',
* // 'Host',
* // '127.0.0.1:8000',
* // 'ACCEPT',
* // '*' ]
* console.log(request.rawHeaders);
* ```
* @since v0.11.6
*/
rawHeaders: string[];
/**
* The request/response trailers object. Only populated at the `'end'` event.
* @since v0.3.0
*/
trailers: NodeJS.Dict<string>;
/**
* Similar to `message.trailers`, but there is no join logic and the values are
* always arrays of strings, even for headers received just once.
* Only populated at the `'end'` event.
* @since v18.3.0, v16.17.0
*/
trailersDistinct: NodeJS.Dict<string[]>;
/**
* The raw request/response trailer keys and values exactly as they were
* received. Only populated at the `'end'` event.
* @since v0.11.6
*/
rawTrailers: string[];
/**
* Calls `message.socket.setTimeout(msecs, callback)`.
* @since v0.5.9
*/
setTimeout(msecs: number, callback?: () => void): this;
/**
* **Only valid for request obtained from {@link Server}.**
*
* The request method as a string. Read only. Examples: `'GET'`, `'DELETE'`.
* @since v0.1.1
*/
method?: string | undefined;
/**
* **Only valid for request obtained from {@link Server}.**
*
* Request URL string. This contains only the URL that is present in the actual
* HTTP request. Take the following request:
*
* ```http
* GET /status?name=ryan HTTP/1.1
* Accept: text/plain
* ```
*
* To parse the URL into its parts:
*
* ```js
* new URL(`http://${process.env.HOST ?? 'localhost'}${request.url}`);
* ```
*
* When `request.url` is `'/status?name=ryan'` and `process.env.HOST` is undefined:
*
* ```console
* $ node
* > new URL(`http://${process.env.HOST ?? 'localhost'}${request.url}`);
* URL {
* href: 'http://localhost/status?name=ryan',
* origin: 'http://localhost',
* protocol: 'http:',
* username: '',
* password: '',
* host: 'localhost',
* hostname: 'localhost',
* port: '',
* pathname: '/status',
* search: '?name=ryan',
* searchParams: URLSearchParams { 'name' => 'ryan' },
* hash: ''
* }
* ```
*
* Ensure that you set `process.env.HOST` to the server's host name, or consider replacing this part entirely. If using `req.headers.host`, ensure proper
* validation is used, as clients may specify a custom `Host` header.
* @since v0.1.90
*/
url?: string | undefined;
/**
* **Only valid for response obtained from {@link ClientRequest}.**
*
* The 3-digit HTTP response status code. E.G. `404`.
* @since v0.1.1
*/
statusCode?: number | undefined;
/**
* **Only valid for response obtained from {@link ClientRequest}.**
*
* The HTTP response status message (reason phrase). E.G. `OK` or `Internal Server Error`.
* @since v0.11.10
*/
statusMessage?: string | undefined;
/**
* Calls `destroy()` on the socket that received the `IncomingMessage`. If `error` is provided, an `'error'` event is emitted on the socket and `error` is passed
* as an argument to any listeners on the event.
* @since v0.3.0
*/
destroy(error?: Error): this;
}
interface AgentOptions extends Partial<TcpSocketConnectOpts> {
/**
* Keep sockets around in a pool to be used by other requests in the future. Default = false
*/
keepAlive?: boolean | undefined;
/**
* When using HTTP KeepAlive, how often to send TCP KeepAlive packets over sockets being kept alive. Default = 1000.
* Only relevant if keepAlive is set to true.
*/
keepAliveMsecs?: number | undefined;
/**
* Maximum number of sockets to allow per host. Default for Node 0.10 is 5, default for Node 0.12 is Infinity
*/
maxSockets?: number | undefined;
/**
* Maximum number of sockets allowed for all hosts in total. Each request will use a new socket until the maximum is reached. Default: Infinity.
*/
maxTotalSockets?: number | undefined;
/**
* Maximum number of sockets to leave open in a free state. Only relevant if keepAlive is set to true. Default = 256.
*/
maxFreeSockets?: number | undefined;
/**
* Socket timeout in milliseconds. This will set the timeout after the socket is connected.
*/
timeout?: number | undefined;
/**
* Scheduling strategy to apply when picking the next free socket to use.
* @default `lifo`
*/
scheduling?: "fifo" | "lifo" | undefined;
}
/**
* An `Agent` is responsible for managing connection persistence
* and reuse for HTTP clients. It maintains a queue of pending requests
* for a given host and port, reusing a single socket connection for each
* until the queue is empty, at which time the socket is either destroyed
* or put into a pool where it is kept to be used again for requests to the
* same host and port. Whether it is destroyed or pooled depends on the `keepAlive` `option`.
*
* Pooled connections have TCP Keep-Alive enabled for them, but servers may
* still close idle connections, in which case they will be removed from the
* pool and a new connection will be made when a new HTTP request is made for
* that host and port. Servers may also refuse to allow multiple requests
* over the same connection, in which case the connection will have to be
* remade for every request and cannot be pooled. The `Agent` will still make
* the requests to that server, but each one will occur over a new connection.
*
* When a connection is closed by the client or the server, it is removed
* from the pool. Any unused sockets in the pool will be unrefed so as not
* to keep the Node.js process running when there are no outstanding requests.
* (see `socket.unref()`).
*
* It is good practice, to `destroy()` an `Agent` instance when it is no
* longer in use, because unused sockets consume OS resources.
*
* Sockets are removed from an agent when the socket emits either
* a `'close'` event or an `'agentRemove'` event. When intending to keep one
* HTTP request open for a long time without keeping it in the agent, something
* like the following may be done:
*
* ```js
* http.get(options, (res) => {
* // Do stuff
* }).on('socket', (socket) => {
* socket.emit('agentRemove');
* });
* ```
*
* An agent may also be used for an individual request. By providing `{agent: false}` as an option to the `http.get()` or `http.request()` functions, a one-time use `Agent` with default options
* will be used
* for the client connection.
*
* `agent:false`:
*
* ```js
* http.get({
* hostname: 'localhost',
* port: 80,
* path: '/',
* agent: false, // Create a new agent just for this one request
* }, (res) => {
* // Do stuff with response
* });
* ```
*
* `options` in [`socket.connect()`](https://nodejs.org/docs/latest-v20.x/api/net.html#socketconnectoptions-connectlistener) are also supported.
*
* To configure any of them, a custom {@link Agent} instance must be created.
*
* ```js
* const http = require('node:http');
* const keepAliveAgent = new http.Agent({ keepAlive: true });
* options.agent = keepAliveAgent;
* http.request(options, onResponseCallback)
* ```
* @since v0.3.4
*/
class Agent extends EventEmitter {
/**
* By default set to 256. For agents with `keepAlive` enabled, this
* sets the maximum number of sockets that will be left open in the free
* state.
* @since v0.11.7
*/
maxFreeSockets: number;
/**
* By default set to `Infinity`. Determines how many concurrent sockets the agent
* can have open per origin. Origin is the returned value of `agent.getName()`.
* @since v0.3.6
*/
maxSockets: number;
/**
* By default set to `Infinity`. Determines how many concurrent sockets the agent
* can have open. Unlike `maxSockets`, this parameter applies across all origins.
* @since v14.5.0, v12.19.0
*/
maxTotalSockets: number;
/**
* An object which contains arrays of sockets currently awaiting use by
* the agent when `keepAlive` is enabled. Do not modify.
*
* Sockets in the `freeSockets` list will be automatically destroyed and
* removed from the array on `'timeout'`.
* @since v0.11.4
*/
readonly freeSockets: NodeJS.ReadOnlyDict<Socket[]>;
/**
* An object which contains arrays of sockets currently in use by the
* agent. Do not modify.
* @since v0.3.6
*/
readonly sockets: NodeJS.ReadOnlyDict<Socket[]>;
/**
* An object which contains queues of requests that have not yet been assigned to
* sockets. Do not modify.
* @since v0.5.9
*/
readonly requests: NodeJS.ReadOnlyDict<IncomingMessage[]>;
constructor(opts?: AgentOptions);
/**
* Destroy any sockets that are currently in use by the agent.
*
* It is usually not necessary to do this. However, if using an
* agent with `keepAlive` enabled, then it is best to explicitly shut down
* the agent when it is no longer needed. Otherwise,
* sockets might stay open for quite a long time before the server
* terminates them.
* @since v0.11.4
*/
destroy(): void;
}
const METHODS: string[];
const STATUS_CODES: {
[errorCode: number]: string | undefined;
[errorCode: string]: string | undefined;
};
/**
* Returns a new instance of {@link Server}.
*
* The `requestListener` is a function which is automatically
* added to the `'request'` event.
*
* ```js
* import http from 'node:http';
*
* // Create a local server to receive data from
* const server = http.createServer((req, res) => {
* res.writeHead(200, { 'Content-Type': 'application/json' });
* res.end(JSON.stringify({
* data: 'Hello World!',
* }));
* });
*
* server.listen(8000);
* ```
*
* ```js
* import http from 'node:http';
*
* // Create a local server to receive data from
* const server = http.createServer();
*
* // Listen to the request event
* server.on('request', (request, res) => {
* res.writeHead(200, { 'Content-Type': 'application/json' });
* res.end(JSON.stringify({
* data: 'Hello World!',
* }));
* });
*
* server.listen(8000);
* ```
* @since v0.1.13
*/
function createServer<
Request extends typeof IncomingMessage = typeof IncomingMessage,
Response extends typeof ServerResponse = typeof ServerResponse,
>(requestListener?: RequestListener<Request, Response>): Server<Request, Response>;
function createServer<
Request extends typeof IncomingMessage = typeof IncomingMessage,
Response extends typeof ServerResponse = typeof ServerResponse,
>(
options: ServerOptions<Request, Response>,
requestListener?: RequestListener<Request, Response>,
): Server<Request, Response>;
// although RequestOptions are passed as ClientRequestArgs to ClientRequest directly,
// create interface RequestOptions would make the naming more clear to developers
interface RequestOptions extends ClientRequestArgs {}
/**
* `options` in `socket.connect()` are also supported.
*
* Node.js maintains several connections per server to make HTTP requests.
* This function allows one to transparently issue requests.
*
* `url` can be a string or a `URL` object. If `url` is a
* string, it is automatically parsed with `new URL()`. If it is a `URL` object, it will be automatically converted to an ordinary `options` object.
*
* If both `url` and `options` are specified, the objects are merged, with the `options` properties taking precedence.
*
* The optional `callback` parameter will be added as a one-time listener for
* the `'response'` event.
*
* `http.request()` returns an instance of the {@link ClientRequest} class. The `ClientRequest` instance is a writable stream. If one needs to
* upload a file with a POST request, then write to the `ClientRequest` object.
*
* ```js
* import http from 'node:http';
* import { Buffer } from 'node:buffer';
*
* const postData = JSON.stringify({
* 'msg': 'Hello World!',
* });
*
* const options = {
* hostname: 'www.google.com',
* port: 80,
* path: '/upload',
* method: 'POST',
* headers: {
* 'Content-Type': 'application/json',
* 'Content-Length': Buffer.byteLength(postData),
* },
* };
*
* const req = http.request(options, (res) => {
* console.log(`STATUS: ${res.statusCode}`);
* console.log(`HEADERS: ${JSON.stringify(res.headers)}`);
* res.setEncoding('utf8');
* res.on('data', (chunk) => {
* console.log(`BODY: ${chunk}`);
* });
* res.on('end', () => {
* console.log('No more data in response.');
* });
* });
*
* req.on('error', (e) => {
* console.error(`problem with request: ${e.message}`);
* });
*
* // Write data to request body
* req.write(postData);
* req.end();
* ```
*
* In the example `req.end()` was called. With `http.request()` one
* must always call `req.end()` to signify the end of the request -
* even if there is no data being written to the request body.
*
* If any error is encountered during the request (be that with DNS resolution,
* TCP level errors, or actual HTTP parse errors) an `'error'` event is emitted
* on the returned request object. As with all `'error'` events, if no listeners
* are registered the error will be thrown.
*
* There are a few special headers that should be noted.
*
* * Sending a 'Connection: keep-alive' will notify Node.js that the connection to
* the server should be persisted until the next request.
* * Sending a 'Content-Length' header will disable the default chunked encoding.
* * Sending an 'Expect' header will immediately send the request headers.
* Usually, when sending 'Expect: 100-continue', both a timeout and a listener
* for the `'continue'` event should be set. See RFC 2616 Section 8.2.3 for more
* information.
* * Sending an Authorization header will override using the `auth` option
* to compute basic authentication.
*
* Example using a `URL` as `options`:
*
* ```js
* const options = new URL('http://abc:xyz@example.com');
*
* const req = http.request(options, (res) => {
* // ...
* });
* ```
*
* In a successful request, the following events will be emitted in the following
* order:
*
* * `'socket'`
* * `'response'`
* * `'data'` any number of times, on the `res` object
* (`'data'` will not be emitted at all if the response body is empty, for
* instance, in most redirects)
* * `'end'` on the `res` object
* * `'close'`
*
* In the case of a connection error, the following events will be emitted:
*
* * `'socket'`
* * `'error'`
* * `'close'`
*
* In the case of a premature connection close before the response is received,
* the following events will be emitted in the following order:
*
* * `'socket'`
* * `'error'` with an error with message `'Error: socket hang up'` and code `'ECONNRESET'`
* * `'close'`
*
* In the case of a premature connection close after the response is received,
* the following events will be emitted in the following order:
*
* * `'socket'`
* * `'response'`
* * `'data'` any number of times, on the `res` object
* * (connection closed here)
* * `'aborted'` on the `res` object
* * `'close'`
* * `'error'` on the `res` object with an error with message `'Error: aborted'` and code `'ECONNRESET'`
* * `'close'` on the `res` object
*
* If `req.destroy()` is called before a socket is assigned, the following
* events will be emitted in the following order:
*
* * (`req.destroy()` called here)
* * `'error'` with an error with message `'Error: socket hang up'` and code `'ECONNRESET'`, or the error with which `req.destroy()` was called
* * `'close'`
*
* If `req.destroy()` is called before the connection succeeds, the following
* events will be emitted in the following order:
*
* * `'socket'`
* * (`req.destroy()` called here)
* * `'error'` with an error with message `'Error: socket hang up'` and code `'ECONNRESET'`, or the error with which `req.destroy()` was called
* * `'close'`
*
* If `req.destroy()` is called after the response is received, the following
* events will be emitted in the following order:
*
* * `'socket'`
* * `'response'`
* * `'data'` any number of times, on the `res` object
* * (`req.destroy()` called here)
* * `'aborted'` on the `res` object
* * `'close'`
* * `'error'` on the `res` object with an error with message `'Error: aborted'` and code `'ECONNRESET'`, or the error with which `req.destroy()` was called
* * `'close'` on the `res` object
*
* If `req.abort()` is called before a socket is assigned, the following
* events will be emitted in the following order:
*
* * (`req.abort()` called here)
* * `'abort'`
* * `'close'`
*
* If `req.abort()` is called before the connection succeeds, the following
* events will be emitted in the following order:
*
* * `'socket'`
* * (`req.abort()` called here)
* * `'abort'`
* * `'error'` with an error with message `'Error: socket hang up'` and code `'ECONNRESET'`
* * `'close'`
*
* If `req.abort()` is called after the response is received, the following
* events will be emitted in the following order:
*
* * `'socket'`
* * `'response'`
* * `'data'` any number of times, on the `res` object
* * (`req.abort()` called here)
* * `'abort'`
* * `'aborted'` on the `res` object
* * `'error'` on the `res` object with an error with message `'Error: aborted'` and code `'ECONNRESET'`.
* * `'close'`
* * `'close'` on the `res` object
*
* Setting the `timeout` option or using the `setTimeout()` function will
* not abort the request or do anything besides add a `'timeout'` event.
*
* Passing an `AbortSignal` and then calling `abort()` on the corresponding `AbortController` will behave the same way as calling `.destroy()` on the
* request. Specifically, the `'error'` event will be emitted with an error with
* the message `'AbortError: The operation was aborted'`, the code `'ABORT_ERR'` and the `cause`, if one was provided.
* @since v0.3.6
*/
function request(options: RequestOptions | string | URL, callback?: (res: IncomingMessage) => void): ClientRequest;
function request(
url: string | URL,
options: RequestOptions,
callback?: (res: IncomingMessage) => void,
): ClientRequest;
/**
* Since most requests are GET requests without bodies, Node.js provides this
* convenience method. The only difference between this method and {@link request} is that it sets the method to GET by default and calls `req.end()` automatically. The callback must take care to
* consume the response
* data for reasons stated in {@link ClientRequest} section.
*
* The `callback` is invoked with a single argument that is an instance of {@link IncomingMessage}.
*
* JSON fetching example:
*
* ```js
* http.get('http://localhost:8000/', (res) => {
* const { statusCode } = res;
* const contentType = res.headers['content-type'];
*
* let error;
* // Any 2xx status code signals a successful response but
* // here we're only checking for 200.
* if (statusCode !== 200) {
* error = new Error('Request Failed.\n' +
* `Status Code: ${statusCode}`);
* } else if (!/^application\/json/.test(contentType)) {
* error = new Error('Invalid content-type.\n' +
* `Expected application/json but received ${contentType}`);
* }
* if (error) {
* console.error(error.message);
* // Consume response data to free up memory
* res.resume();
* return;
* }
*
* res.setEncoding('utf8');
* let rawData = '';
* res.on('data', (chunk) => { rawData += chunk; });
* res.on('end', () => {
* try {
* const parsedData = JSON.parse(rawData);
* console.log(parsedData);
* } catch (e) {
* console.error(e.message);
* }
* });
* }).on('error', (e) => {
* console.error(`Got error: ${e.message}`);
* });
*
* // Create a local server to receive data from
* const server = http.createServer((req, res) => {
* res.writeHead(200, { 'Content-Type': 'application/json' });
* res.end(JSON.stringify({
* data: 'Hello World!',
* }));
* });
*
* server.listen(8000);
* ```
* @since v0.3.6
* @param options Accepts the same `options` as {@link request}, with the method set to GET by default.
*/
function get(options: RequestOptions | string | URL, callback?: (res: IncomingMessage) => void): ClientRequest;
function get(url: string | URL, options: RequestOptions, callback?: (res: IncomingMessage) => void): ClientRequest;
/**
* Performs the low-level validations on the provided `name` that are done when `res.setHeader(name, value)` is called.
*
* Passing illegal value as `name` will result in a `TypeError` being thrown,
* identified by `code: 'ERR_INVALID_HTTP_TOKEN'`.
*
* It is not necessary to use this method before passing headers to an HTTP request
* or response. The HTTP module will automatically validate such headers.
*
* Example:
*
* ```js
* import { validateHeaderName } from 'node:http';
*
* try {
* validateHeaderName('');
* } catch (err) {
* console.error(err instanceof TypeError); // --> true
* console.error(err.code); // --> 'ERR_INVALID_HTTP_TOKEN'
* console.error(err.message); // --> 'Header name must be a valid HTTP token [""]'
* }
* ```
* @since v14.3.0
* @param [label='Header name'] Label for error message.
*/
function validateHeaderName(name: string): void;
/**
* Performs the low-level validations on the provided `value` that are done when `res.setHeader(name, value)` is called.
*
* Passing illegal value as `value` will result in a `TypeError` being thrown.
*
* * Undefined value error is identified by `code: 'ERR_HTTP_INVALID_HEADER_VALUE'`.
* * Invalid value character error is identified by `code: 'ERR_INVALID_CHAR'`.
*
* It is not necessary to use this method before passing headers to an HTTP request
* or response. The HTTP module will automatically validate such headers.
*
* Examples:
*
* ```js
* import { validateHeaderValue } from 'node:http';
*
* try {
* validateHeaderValue('x-my-header', undefined);
* } catch (err) {
* console.error(err instanceof TypeError); // --> true
* console.error(err.code === 'ERR_HTTP_INVALID_HEADER_VALUE'); // --> true
* console.error(err.message); // --> 'Invalid value "undefined" for header "x-my-header"'
* }
*
* try {
* validateHeaderValue('x-my-header', 'oʊmɪɡə');
* } catch (err) {
* console.error(err instanceof TypeError); // --> true
* console.error(err.code === 'ERR_INVALID_CHAR'); // --> true
* console.error(err.message); // --> 'Invalid character in header content ["x-my-header"]'
* }
* ```
* @since v14.3.0
* @param name Header name
* @param value Header value
*/
function validateHeaderValue(name: string, value: string): void;
/**
* Set the maximum number of idle HTTP parsers.
* @since v18.8.0, v16.18.0
* @param [max=1000]
*/
function setMaxIdleHTTPParsers(max: number): void;
/**
* Global instance of `Agent` which is used as the default for all HTTP client
* requests. Diverges from a default `Agent` configuration by having `keepAlive`
* enabled and a `timeout` of 5 seconds.
* @since v0.5.9
*/
let globalAgent: Agent;
/**
* Read-only property specifying the maximum allowed size of HTTP headers in bytes.
* Defaults to 16KB. Configurable using the `--max-http-header-size` CLI option.
*/
const maxHeaderSize: number;
}
declare module "node:http" {
export * from "http";
}