Adding upstream version 115.7.0esr.upstream/115.7.0esrupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

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+# ws
+
+## Table of Contents
+
+- [Class: WebSocketServer](#class-websocketserver)
+  - [new WebSocketServer(options[, callback])](#new-websocketserveroptions-callback)
+  - [Event: 'close'](#event-close)
+  - [Event: 'connection'](#event-connection)
+  - [Event: 'error'](#event-error)
+  - [Event: 'headers'](#event-headers)
+  - [Event: 'listening'](#event-listening)
+  - [Event: 'wsClientError'](#event-wsclienterror)
+  - [server.address()](#serveraddress)
+  - [server.clients](#serverclients)
+  - [server.close([callback])](#serverclosecallback)
+  - [server.handleUpgrade(request, socket, head, callback)](#serverhandleupgraderequest-socket-head-callback)
+  - [server.shouldHandle(request)](#servershouldhandlerequest)
+- [Class: WebSocket](#class-websocket)
+  - [Ready state constants](#ready-state-constants)
+  - [new WebSocket(address[, protocols][, options])](#new-websocketaddress-protocols-options)
+    - [UNIX Domain Sockets](#unix-domain-sockets)
+  - [Event: 'close'](#event-close-1)
+  - [Event: 'error'](#event-error-1)
+  - [Event: 'message'](#event-message)
+  - [Event: 'open'](#event-open)
+  - [Event: 'ping'](#event-ping)
+  - [Event: 'pong'](#event-pong)
+  - [Event: 'redirect'](#event-redirect)
+  - [Event: 'unexpected-response'](#event-unexpected-response)
+  - [Event: 'upgrade'](#event-upgrade)
+  - [websocket.addEventListener(type, listener[, options])](#websocketaddeventlistenertype-listener-options)
+  - [websocket.binaryType](#websocketbinarytype)
+  - [websocket.bufferedAmount](#websocketbufferedamount)
+  - [websocket.close([code[, reason]])](#websocketclosecode-reason)
+  - [websocket.extensions](#websocketextensions)
+  - [websocket.isPaused](#websocketispaused)
+  - [websocket.onclose](#websocketonclose)
+  - [websocket.onerror](#websocketonerror)
+  - [websocket.onmessage](#websocketonmessage)
+  - [websocket.onopen](#websocketonopen)
+  - [websocket.pause()](#websocketpause)
+  - [websocket.ping([data[, mask]][, callback])](#websocketpingdata-mask-callback)
+  - [websocket.pong([data[, mask]][, callback])](#websocketpongdata-mask-callback)
+  - [websocket.protocol](#websocketprotocol)
+  - [websocket.readyState](#websocketreadystate)
+  - [websocket.removeEventListener(type, listener)](#websocketremoveeventlistenertype-listener)
+  - [websocket.resume()](#websocketresume)
+  - [websocket.send(data[, options][, callback])](#websocketsenddata-options-callback)
+  - [websocket.terminate()](#websocketterminate)
+  - [websocket.url](#websocketurl)
+- [createWebSocketStream(websocket[, options])](#createwebsocketstreamwebsocket-options)
+- [Environment variables](#environment-variables)
+  - [WS_NO_BUFFER_UTIL](#ws_no_buffer_util)
+  - [WS_NO_UTF_8_VALIDATE](#ws_no_utf_8_validate)
+- [Error codes](#error-codes)
+  - [WS_ERR_EXPECTED_FIN](#ws_err_expected_fin)
+  - [WS_ERR_EXPECTED_MASK](#ws_err_expected_mask)
+  - [WS_ERR_INVALID_CLOSE_CODE](#ws_err_invalid_close_code)
+  - [WS_ERR_INVALID_CONTROL_PAYLOAD_LENGTH](#ws_err_invalid_control_payload_length)
+  - [WS_ERR_INVALID_OPCODE](#ws_err_invalid_opcode)
+  - [WS_ERR_INVALID_UTF8](#ws_err_invalid_utf8)
+  - [WS_ERR_UNEXPECTED_MASK](#ws_err_unexpected_mask)
+  - [WS_ERR_UNEXPECTED_RSV_1](#ws_err_unexpected_rsv_1)
+  - [WS_ERR_UNEXPECTED_RSV_2_3](#ws_err_unexpected_rsv_2_3)
+  - [WS_ERR_UNSUPPORTED_DATA_PAYLOAD_LENGTH](#ws_err_unsupported_data_payload_length)
+  - [WS_ERR_UNSUPPORTED_MESSAGE_LENGTH](#ws_err_unsupported_message_length)
+
+## Class: WebSocketServer
+
+This class represents a WebSocket server. It extends the `EventEmitter`.
+
+### new WebSocketServer(options[, callback])
+
+- `options` {Object}
+  - `backlog` {Number} The maximum length of the queue of pending connections.
+  - `clientTracking` {Boolean} Specifies whether or not to track clients.
+  - `handleProtocols` {Function} A function which can be used to handle the
+    WebSocket subprotocols. See description below.
+  - `host` {String} The hostname where to bind the server.
+  - `maxPayload` {Number} The maximum allowed message size in bytes. Defaults to
+    100 MiB (104857600 bytes).
+  - `noServer` {Boolean} Enable no server mode.
+  - `path` {String} Accept only connections matching this path.
+  - `perMessageDeflate` {Boolean|Object} Enable/disable permessage-deflate.
+  - `port` {Number} The port where to bind the server.
+  - `server` {http.Server|https.Server} A pre-created Node.js HTTP/S server.
+  - `skipUTF8Validation` {Boolean} Specifies whether or not to skip UTF-8
+    validation for text and close messages. Defaults to `false`. Set to `true`
+    only if clients are trusted.
+  - `verifyClient` {Function} A function which can be used to validate incoming
+    connections. See description below. (Usage is discouraged: see
+    [Issue #337](https://github.com/websockets/ws/issues/377#issuecomment-462152231))
+  - `WebSocket` {Function} Specifies the `WebSocket` class to be used. It must
+    be extended from the original `WebSocket`. Defaults to `WebSocket`.
+- `callback` {Function}
+
+Create a new server instance. One and only one of `port`, `server` or `noServer`
+must be provided or an error is thrown. An HTTP server is automatically created,
+started, and used if `port` is set. To use an external HTTP/S server instead,
+specify only `server` or `noServer`. In this case the HTTP/S server must be
+started manually. The "noServer" mode allows the WebSocket server to be
+completely detached from the HTTP/S server. This makes it possible, for example,
+to share a single HTTP/S server between multiple WebSocket servers.
+
+> **NOTE:** Use of `verifyClient` is discouraged. Rather handle client
+> authentication in the `upgrade` event of the HTTP server. See examples for
+> more details.
+
+If `verifyClient` is not set then the handshake is automatically accepted. If it
+has a single parameter then `ws` will invoke it with the following argument:
+
+- `info` {Object}
+  - `origin` {String} The value in the Origin header indicated by the client.
+  - `req` {http.IncomingMessage} The client HTTP GET request.
+  - `secure` {Boolean} `true` if `req.socket.authorized` or
+    `req.socket.encrypted` is set.
+
+The return value (`Boolean`) of the function determines whether or not to accept
+the handshake.
+
+If `verifyClient` has two parameters then `ws` will invoke it with the following
+arguments:
+
+- `info` {Object} Same as above.
+- `cb` {Function} A callback that must be called by the user upon inspection of
+  the `info` fields. Arguments in this callback are:
+  - `result` {Boolean} Whether or not to accept the handshake.
+  - `code` {Number} When `result` is `false` this field determines the HTTP
+    error status code to be sent to the client.
+  - `name` {String} When `result` is `false` this field determines the HTTP
+    reason phrase.
+  - `headers` {Object} When `result` is `false` this field determines additional
+    HTTP headers to be sent to the client. For example,
+    `{ 'Retry-After': 120 }`.
+
+`handleProtocols` takes two arguments:
+
+- `protocols` {Set} The list of WebSocket subprotocols indicated by the client
+  in the `Sec-WebSocket-Protocol` header.
+- `request` {http.IncomingMessage} The client HTTP GET request.
+
+The returned value sets the value of the `Sec-WebSocket-Protocol` header in the
+HTTP 101 response. If returned value is `false` the header is not added in the
+response.
+
+If `handleProtocols` is not set then the first of the client's requested
+subprotocols is used.
+
+`perMessageDeflate` can be used to control the behavior of [permessage-deflate
+extension][permessage-deflate]. The extension is disabled when `false` (default
+value). If an object is provided then that is extension parameters:
+
+- `serverNoContextTakeover` {Boolean} Whether to use context takeover or not.
+- `clientNoContextTakeover` {Boolean} Acknowledge disabling of client context
+  takeover.
+- `serverMaxWindowBits` {Number} The value of `windowBits`.
+- `clientMaxWindowBits` {Number} Request a custom client window size.
+- `zlibDeflateOptions` {Object} [Additional options][zlib-options] to pass to
+  zlib on deflate.
+- `zlibInflateOptions` {Object} [Additional options][zlib-options] to pass to
+  zlib on inflate.
+- `threshold` {Number} Payloads smaller than this will not be compressed if
+  context takeover is disabled. Defaults to 1024 bytes.
+- `concurrencyLimit` {Number} The number of concurrent calls to zlib. Calls
+  above this limit will be queued. Default 10. You usually won't need to touch
+  this option. See [this issue][concurrency-limit] for more details.
+
+If a property is empty then either an offered configuration or a default value
+is used. When sending a fragmented message the length of the first fragment is
+compared to the threshold. This determines if compression is used for the entire
+message.
+
+`callback` will be added as a listener for the `listening` event on the HTTP
+server when not operating in "noServer" mode.
+
+### Event: 'close'
+
+Emitted when the server closes. This event depends on the `'close'` event of
+HTTP server only when it is created internally. In all other cases, the event is
+emitted independently.
+
+### Event: 'connection'
+
+- `websocket` {WebSocket}
+- `request` {http.IncomingMessage}
+
+Emitted when the handshake is complete. `request` is the http GET request sent
+by the client. Useful for parsing authority headers, cookie headers, and other
+information.
+
+### Event: 'error'
+
+- `error` {Error}
+
+Emitted when an error occurs on the underlying server.
+
+### Event: 'headers'
+
+- `headers` {Array}
+- `request` {http.IncomingMessage}
+
+Emitted before the response headers are written to the socket as part of the
+handshake. This allows you to inspect/modify the headers before they are sent.
+
+### Event: 'listening'
+
+Emitted when the underlying server has been bound.
+
+### Event: 'wsClientError'
+
+- `error` {Error}
+- `socket` {net.Socket|tls.Socket}
+- `request` {http.IncomingMessage}
+
+Emitted when an error occurs before the WebSocket connection is established.
+`socket` and `request` are respectively the socket and the HTTP request from
+which the error originated. The listener of this event is responsible for
+closing the socket. When the `'wsClientError'` event is emitted there is no
+`http.ServerResponse` object, so any HTTP response, including the response
+headers and body, must be written directly to the `socket`. If there is no
+listener for this event, the socket is closed with a default 4xx response
+containing a descriptive error message.
+
+### server.address()
+
+Returns an object with `port`, `family`, and `address` properties specifying the
+bound address, the address family name, and port of the server as reported by
+the operating system if listening on an IP socket. If the server is listening on
+a pipe or UNIX domain socket, the name is returned as a string.
+
+### server.clients
+
+- {Set}
+
+A set that stores all connected clients. Please note that this property is only
+added when the `clientTracking` is truthy.
+
+### server.close([callback])
+
+Prevent the server from accepting new connections and close the HTTP server if
+created internally. If an external HTTP server is used via the `server` or
+`noServer` constructor options, it must be closed manually. Existing connections
+are not closed automatically. The server emits a `'close'` event when all
+connections are closed unless an external HTTP server is used and client
+tracking is disabled. In this case the `'close'` event is emitted in the next
+tick. The optional callback is called when the `'close'` event occurs and
+receives an `Error` if the server is already closed.
+
+### server.handleUpgrade(request, socket, head, callback)
+
+- `request` {http.IncomingMessage} The client HTTP GET request.
+- `socket` {net.Socket|tls.Socket} The network socket between the server and
+  client.
+- `head` {Buffer} The first packet of the upgraded stream.
+- `callback` {Function}.
+
+Handle a HTTP upgrade request. When the HTTP server is created internally or
+when the HTTP server is passed via the `server` option, this method is called
+automatically. When operating in "noServer" mode, this method must be called
+manually.
+
+If the upgrade is successful, the `callback` is called with two arguments:
+
+- `websocket` {WebSocket} A `WebSocket` object.
+- `request` {http.IncomingMessage} The client HTTP GET request.
+
+### server.shouldHandle(request)
+
+- `request` {http.IncomingMessage} The client HTTP GET request.
+
+See if a given request should be handled by this server. By default this method
+validates the pathname of the request, matching it against the `path` option if
+provided. The return value, `true` or `false`, determines whether or not to
+accept the handshake.
+
+This method can be overridden when a custom handling logic is required.
+
+## Class: WebSocket
+
+This class represents a WebSocket. It extends the `EventEmitter`.
+
+### Ready state constants
+
+| Constant   | Value | Description                                      |
+| ---------- | ----- | ------------------------------------------------ |
+| CONNECTING | 0     | The connection is not yet open.                  |
+| OPEN       | 1     | The connection is open and ready to communicate. |
+| CLOSING    | 2     | The connection is in the process of closing.     |
+| CLOSED     | 3     | The connection is closed.                        |
+
+### new WebSocket(address[, protocols][, options])
+
+- `address` {String|url.URL} The URL to which to connect.
+- `protocols` {String|Array} The list of subprotocols.
+- `options` {Object}
+  - `followRedirects` {Boolean} Whether or not to follow redirects. Defaults to
+    `false`.
+  - `generateMask` {Function} The function used to generate the masking key. It
+    takes a `Buffer` that must be filled synchronously and is called before a
+    message is sent, for each message. By default the buffer is filled with
+    cryptographically strong random bytes.
+  - `handshakeTimeout` {Number} Timeout in milliseconds for the handshake
+    request. This is reset after every redirection.
+  - `maxPayload` {Number} The maximum allowed message size in bytes. Defaults to
+    100 MiB (104857600 bytes).
+  - `maxRedirects` {Number} The maximum number of redirects allowed. Defaults
+    to 10.
+  - `origin` {String} Value of the `Origin` or `Sec-WebSocket-Origin` header
+    depending on the `protocolVersion`.
+  - `perMessageDeflate` {Boolean|Object} Enable/disable permessage-deflate.
+  - `protocolVersion` {Number} Value of the `Sec-WebSocket-Version` header.
+  - `skipUTF8Validation` {Boolean} Specifies whether or not to skip UTF-8
+    validation for text and close messages. Defaults to `false`. Set to `true`
+    only if the server is trusted.
+  - Any other option allowed in [`http.request()`][] or [`https.request()`][].
+    Options given do not have any effect if parsed from the URL given with the
+    `address` parameter.
+
+`perMessageDeflate` default value is `true`. When using an object, parameters
+are the same of the server. The only difference is the direction of requests.
+For example, `serverNoContextTakeover` can be used to ask the server to disable
+context takeover.
+
+Create a new WebSocket instance.
+
+#### UNIX Domain Sockets
+
+`ws` supports making requests to UNIX domain sockets. To make one, use the
+following URL scheme:
+
+```
+ws+unix:///absolute/path/to/uds_socket:/pathname?search_params
+```
+
+Note that `:` is the separator between the socket path and the URL path. If the
+URL path is omitted
+
+```
+ws+unix:///absolute/path/to/uds_socket
+```
+
+it defaults to `/`.
+
+### Event: 'close'
+
+- `code` {Number}
+- `reason` {Buffer}
+
+Emitted when the connection is closed. `code` is a numeric value indicating the
+status code explaining why the connection has been closed. `reason` is a
+`Buffer` containing a human-readable string explaining why the connection has
+been closed.
+
+### Event: 'error'
+
+- `error` {Error}
+
+Emitted when an error occurs. Errors may have a `.code` property, matching one
+of the string values defined below under [Error codes](#error-codes).
+
+### Event: 'message'
+
+- `data` {Buffer|ArrayBuffer|Buffer[]}
+- `isBinary` {Boolean}
+
+Emitted when a message is received. `data` is the message content. `isBinary`
+specifies whether the message is binary or not.
+
+### Event: 'open'
+
+Emitted when the connection is established.
+
+### Event: 'ping'
+
+- `data` {Buffer}
+
+Emitted when a ping is received from the server.
+
+### Event: 'pong'
+
+- `data` {Buffer}
+
+Emitted when a pong is received from the server.
+
+### Event: 'redirect'
+
+- `url` {String}
+- `request` {http.ClientRequest}
+
+Emitted before a redirect is followed. `url` is the redirect URL. `request` is
+the HTTP GET request with the headers queued. This event gives the ability to
+inspect confidential headers and remove them on a per-redirect basis using the
+[`request.getHeader()`][] and [`request.removeHeader()`][] API. The `request`
+object should be used only for this purpose. When there is at least one listener
+for this event, no header is removed by default, even if the redirect is to a
+different domain.
+
+### Event: 'unexpected-response'
+
+- `request` {http.ClientRequest}
+- `response` {http.IncomingMessage}
+
+Emitted when the server response is not the expected one, for example a 401
+response. This event gives the ability to read the response in order to extract
+useful information. If the server sends an invalid response and there isn't a
+listener for this event, an error is emitted.
+
+### Event: 'upgrade'
+
+- `response` {http.IncomingMessage}
+
+Emitted when response headers are received from the server as part of the
+handshake. This allows you to read headers from the server, for example
+'set-cookie' headers.
+
+### websocket.addEventListener(type, listener[, options])
+
+- `type` {String} A string representing the event type to listen for.
+- `listener` {Function} The listener to add.
+- `options` {Object}
+  - `once` {Boolean} A `Boolean` indicating that the listener should be invoked
+    at most once after being added. If `true`, the listener would be
+    automatically removed when invoked.
+
+Register an event listener emulating the `EventTarget` interface. This method
+does nothing if `type` is not one of `'close'`, `'error'`, `'message'`, or
+`'open'`.
+
+### websocket.binaryType
+
+- {String}
+
+A string indicating the type of binary data being transmitted by the connection.
+This should be one of "nodebuffer", "arraybuffer" or "fragments". Defaults to
+"nodebuffer". Type "fragments" will emit the array of fragments as received from
+the sender, without copyfull concatenation, which is useful for the performance
+of binary protocols transferring large messages with multiple fragments.
+
+### websocket.bufferedAmount
+
+- {Number}
+
+The number of bytes of data that have been queued using calls to `send()` but
+not yet transmitted to the network. This deviates from the HTML standard in the
+following ways:
+
+1. If the data is immediately sent the value is `0`.
+1. All framing bytes are included.
+
+### websocket.close([code[, reason]])
+
+- `code` {Number} A numeric value indicating the status code explaining why the
+  connection is being closed.
+- `reason` {String|Buffer} The reason why the connection is closing.
+
+Initiate a closing handshake.
+
+### websocket.isPaused
+
+- {Boolean}
+
+Indicates whether the websocket is paused.
+
+### websocket.extensions
+
+- {Object}
+
+An object containing the negotiated extensions.
+
+### websocket.onclose
+
+- {Function}
+
+An event listener to be called when connection is closed. The listener receives
+a `CloseEvent` named "close".
+
+### websocket.onerror
+
+- {Function}
+
+An event listener to be called when an error occurs. The listener receives an
+`ErrorEvent` named "error".
+
+### websocket.onmessage
+
+- {Function}
+
+An event listener to be called when a message is received from the server. The
+listener receives a `MessageEvent` named "message".
+
+### websocket.onopen
+
+- {Function}
+
+An event listener to be called when the connection is established. The listener
+receives an `OpenEvent` named "open".
+
+### websocket.pause()
+
+Pause the websocket causing it to stop emitting events. Some events can still be
+emitted after this is called, until all buffered data is consumed. This method
+is a noop if the ready state is `CONNECTING` or `CLOSED`.
+
+### websocket.ping([data[, mask]][, callback])
+
+- `data` {Array|Number|Object|String|ArrayBuffer|Buffer|DataView|TypedArray} The
+  data to send in the ping frame.
+- `mask` {Boolean} Specifies whether `data` should be masked or not. Defaults to
+  `true` when `websocket` is not a server client.
+- `callback` {Function} An optional callback which is invoked when the ping
+  frame is written out. If an error occurs, the callback is called with the
+  error as its first argument.
+
+Send a ping. This method throws an error if the ready state is `CONNECTING`.
+
+### websocket.pong([data[, mask]][, callback])
+
+- `data` {Array|Number|Object|String|ArrayBuffer|Buffer|DataView|TypedArray} The
+  data to send in the pong frame.
+- `mask` {Boolean} Specifies whether `data` should be masked or not. Defaults to
+  `true` when `websocket` is not a server client.
+- `callback` {Function} An optional callback which is invoked when the pong
+  frame is written out. If an error occurs, the callback is called with the
+  error as its first argument.
+
+Send a pong. This method throws an error if the ready state is `CONNECTING`.
+
+### websocket.protocol
+
+- {String}
+
+The subprotocol selected by the server.
+
+### websocket.resume()
+
+Make a paused socket resume emitting events. This method is a noop if the ready
+state is `CONNECTING` or `CLOSED`.
+
+### websocket.readyState
+
+- {Number}
+
+The current state of the connection. This is one of the ready state constants.
+
+### websocket.removeEventListener(type, listener)
+
+- `type` {String} A string representing the event type to remove.
+- `listener` {Function} The listener to remove.
+
+Removes an event listener emulating the `EventTarget` interface. This method
+only removes listeners added with
+[`websocket.addEventListener()`](#websocketaddeventlistenertype-listener-options).
+
+### websocket.send(data[, options][, callback])
+
+- `data` {Array|Number|Object|String|ArrayBuffer|Buffer|DataView|TypedArray} The
+  data to send.
+- `options` {Object}
+  - `binary` {Boolean} Specifies whether `data` should be sent as a binary or
+    not. Default is autodetected.
+  - `compress` {Boolean} Specifies whether `data` should be compressed or not.
+    Defaults to `true` when permessage-deflate is enabled.
+  - `fin` {Boolean} Specifies whether `data` is the last fragment of a message
+    or not. Defaults to `true`.
+  - `mask` {Boolean} Specifies whether `data` should be masked or not. Defaults
+    to `true` when `websocket` is not a server client.
+- `callback` {Function} An optional callback which is invoked when `data` is
+  written out. If an error occurs, the callback is called with the error as its
+  first argument.
+
+Send `data` through the connection. This method throws an error if the ready
+state is `CONNECTING`.
+
+### websocket.terminate()
+
+Forcibly close the connection. Internally this calls [`socket.destroy()`][].
+
+### websocket.url
+
+- {String}
+
+The URL of the WebSocket server. Server clients don't have this attribute.
+
+## createWebSocketStream(websocket[, options])
+
+- `websocket` {WebSocket} A `WebSocket` object.
+- `options` {Object} [Options][duplex-options] to pass to the `Duplex`
+  constructor.
+
+Returns a `Duplex` stream that allows to use the Node.js streams API on top of a
+given `WebSocket`.
+
+## Environment variables
+
+### WS_NO_BUFFER_UTIL
+
+When set to a non empty value, prevents the optional `bufferutil` dependency
+from being required.
+
+### WS_NO_UTF_8_VALIDATE
+
+When set to a non empty value, prevents the optional `utf-8-validate` dependency
+from being required.
+
+## Error codes
+
+Errors emitted by the websocket may have a `.code` property, describing the
+specific type of error that has occurred:
+
+### WS_ERR_EXPECTED_FIN
+
+A WebSocket frame was received with the FIN bit not set when it was expected.
+
+### WS_ERR_EXPECTED_MASK
+
+An unmasked WebSocket frame was received by a WebSocket server.
+
+### WS_ERR_INVALID_CLOSE_CODE
+
+A WebSocket close frame was received with an invalid close code.
+
+### WS_ERR_INVALID_CONTROL_PAYLOAD_LENGTH
+
+A control frame with an invalid payload length was received.
+
+### WS_ERR_INVALID_OPCODE
+
+A WebSocket frame was received with an invalid opcode.
+
+### WS_ERR_INVALID_UTF8
+
+A text or close frame was received containing invalid UTF-8 data.
+
+### WS_ERR_UNEXPECTED_MASK
+
+A masked WebSocket frame was received by a WebSocket client.
+
+### WS_ERR_UNEXPECTED_RSV_1
+
+A WebSocket frame was received with the RSV1 bit set unexpectedly.
+
+### WS_ERR_UNEXPECTED_RSV_2_3
+
+A WebSocket frame was received with the RSV2 or RSV3 bit set unexpectedly.
+
+### WS_ERR_UNSUPPORTED_DATA_PAYLOAD_LENGTH
+
+A data frame was received with a length longer than the max supported length
+(2^53 - 1, due to JavaScript language limitations).
+
+### WS_ERR_UNSUPPORTED_MESSAGE_LENGTH
+
+A message was received with a length longer than the maximum supported length,
+as configured by the `maxPayload` option.
+
+[concurrency-limit]: https://github.com/websockets/ws/issues/1202
+[duplex-options]:
+  https://nodejs.org/api/stream.html#stream_new_stream_duplex_options
+[`http.request()`]:
+  https://nodejs.org/api/http.html#http_http_request_options_callback
+[`https.request()`]:
+  https://nodejs.org/api/https.html#https_https_request_options_callback
+[permessage-deflate]:
+  https://tools.ietf.org/html/draft-ietf-hybi-permessage-compression-19
+[`request.getheader()`]: https://nodejs.org/api/http.html#requestgetheadername
+[`request.removeheader()`]:
+  https://nodejs.org/api/http.html#requestremoveheadername
+[`socket.destroy()`]: https://nodejs.org/api/net.html#net_socket_destroy_error
+[zlib-options]: https://nodejs.org/api/zlib.html#zlib_class_options