OutgoingMessage.call(this);

if (req.method === 'HEAD') this._hasBody = false;

this.sendDate = true;

this._sent100 = false;

this._expect_continue = false;

if (req.httpVersionMajor < 1 || req.httpVersionMinor < 1) {

this.useChunkedEncodingByDefault = chunkExpression.test(req.headers.te);

this.shouldKeepAlive = false;

}

DTRACE_HTTP_SERVER_RESPONSE(this.connection);

LTTNG_HTTP_SERVER_RESPONSE(this.connection);

COUNTER_HTTP_SERVER_RESPONSE();

OutgoingMessage.prototype._finish.call(this);

// EventEmitter.emit makes a copy of the 'close' listeners array before

// calling the listeners. detachSocket() unregisters onServerResponseClose

// but if detachSocket() is called, directly or indirectly, by a 'close'

// listener, onServerResponseClose is still in that copy of the listeners

// array. That is, in the example below, b still gets called even though

// it's been removed by a:

//

// var EventEmitter = require('events');

// var obj = new EventEmitter();

// obj.on('event', a);

// obj.on('event', b);

// function a() { obj.removeListener('event', b) }

// function b() { throw "BAM!" }

// obj.emit('event'); // throws

//

// Ergo, we need to deal with stale 'close' events and handle the case

// where the ServerResponse object has already been deconstructed.

// Fortunately, that requires only a single if check. :-)

if (this._httpMessage) this._httpMessage.emit('close');

assert(!socket._httpMessage);

socket._httpMessage = this;

socket.on('close', onServerResponseClose);

this.socket = socket;

this.connection = socket;

this.emit('socket', socket);

this._flush();

assert(socket._httpMessage === this);

socket.removeListener('close', onServerResponseClose);

socket._httpMessage = null;

this.socket = this.connection = null;

var originalStatusCode = statusCode;

statusCode |= 0;

if (statusCode < 100 || statusCode > 999)

throw new RangeError(`Invalid status code: ${originalStatusCode}`);

if (typeof reason === 'string') {

// writeHead(statusCode, reasonPhrase[, headers])

this.statusMessage = reason;

} else {

// writeHead(statusCode[, headers])

if (!this.statusMessage)

this.statusMessage = STATUS_CODES[statusCode] || 'unknown';

obj = reason;

}

this.statusCode = statusCode;

var headers;

if (this[outHeadersKey]) {

// Slow-case: when progressive API and header fields are passed.

var k;

if (obj) {

var keys = Object.keys(obj);

for (var i = 0; i < keys.length; i++) {

k = keys[i];

if (k) this.setHeader(k, obj[k]);

}

}

if (k === undefined) {

if (this._header) {

throw new Error('Can\'t render headers after they are sent to the ' +

'client');

}

}

// only progressive api is used

headers = this[outHeadersKey];

} else {

// only writeHead() called

headers = obj;

}

if (common._checkInvalidHeaderChar(this.statusMessage))

throw new Error('Invalid character in statusMessage.');

var statusLine = 'HTTP/1.1 ' + statusCode + ' ' + this.statusMessage + CRLF;

if (statusCode === 204 || statusCode === 304 ||

(statusCode >= 100 && statusCode <= 199)) {

// RFC 2616, 10.2.5:

// The 204 response MUST NOT include a message-body, and thus is always

// terminated by the first empty line after the header fields.

// RFC 2616, 10.3.5:

// The 304 response MUST NOT contain a message-body, and thus is always

// terminated by the first empty line after the header fields.

// RFC 2616, 10.1 Informational 1xx:

// This class of status code indicates a provisional response,

// consisting only of the Status-Line and optional headers, and is

// terminated by an empty line.

this._hasBody = false;

}

// don't keep alive connections where the client expects 100 Continue

// but we sent a final status; they may put extra bytes on the wire.

if (this._expect_continue && !this._sent100) {

this.shouldKeepAlive = false;

}

this._storeHeader(statusLine, headers);

if (!(this instanceof Server)) return new Server(requestListener);

net.Server.call(this, { allowHalfOpen: true });

if (requestListener) {

this.on('request', requestListener);

}

// Similar option to this. Too lazy to write my own docs.

// http://www.squid-cache.org/Doc/config/half_closed_clients/

// http://wiki.squid-cache.org/SquidFaq/InnerWorkings#What_is_a_half-closed_filedescriptor.3F

this.httpAllowHalfOpen = false;

this.on('connection', connectionListener);

this.timeout = 2 * 60 * 1000;

this._pendingResponseData = 0;

this.maxHeadersCount = null;

this.timeout = msecs;

if (callback)

this.on('timeout', callback);

return this;

debug('SERVER new http connection');

httpSocketSetup(socket);

// If the user has added a listener to the server,

// request, or response, then it's their responsibility.

// otherwise, destroy on timeout by default

if (this.timeout)

socket.setTimeout(this.timeout);

socket.on('timeout', socketOnTimeout);

var parser = parsers.alloc();

parser.reinitialize(HTTPParser.REQUEST);

parser.socket = socket;

socket.parser = parser;

parser.incoming = null;

// Propagate headers limit from server instance to parser

if (typeof this.maxHeadersCount === 'number') {

parser.maxHeaderPairs = this.maxHeadersCount << 1;

} else {

// Set default value because parser may be reused from FreeList

parser.maxHeaderPairs = 2000;

}

var state = {

onData: null,

onEnd: null,

onClose: null,

onDrain: null,

outgoing: [],

incoming: [],

// `outgoingData` is an approximate amount of bytes queued through all

// inactive responses. If more data than the high watermark is queued - we

// need to pause TCP socket/HTTP parser, and wait until the data will be

// sent to the client.

outgoingData: 0

};

state.onData = socketOnData.bind(undefined, this, socket, parser, state);

state.onEnd = socketOnEnd.bind(undefined, this, socket, parser, state);

state.onClose = socketOnClose.bind(undefined, socket, state);

state.onDrain = socketOnDrain.bind(undefined, socket, state);

socket.on('data', state.onData);

socket.on('error', socketOnError);

socket.on('end', state.onEnd);

socket.on('close', state.onClose);

socket.on('drain', state.onDrain);

parser.onIncoming = parserOnIncoming.bind(undefined, this, socket, state);

// We are consuming socket, so it won't get any actual data

socket.on('resume', onSocketResume);

socket.on('pause', onSocketPause);

// Override on to unconsume on `data`, `readable` listeners

socket.on = socketOnWrap;

// We only consume the socket if it has never been consumed before.

var external = socket._handle._externalStream;

if (!socket._handle._consumed && external) {

parser._consumed = true;

socket._handle._consumed = true;

parser.consume(external);

}

parser[kOnExecute] =

onParserExecute.bind(undefined, this, socket, parser, state);

socket._paused = false;

state.outgoingData += delta;

if (socket._paused &&

state.outgoingData < socket._writableState.highWaterMark) {

return socketOnDrain(socket, state);

}

var needPause = state.outgoingData > socket._writableState.highWaterMark;

// If we previously paused, then start reading again.

if (socket._paused && !needPause) {

socket._paused = false;

if (socket.parser)

socket.parser.resume();

socket.resume();

}

var req = this.parser && this.parser.incoming;

var reqTimeout = req && !req.complete && req.emit('timeout', this);

var res = this._httpMessage;

var resTimeout = res && res.emit('timeout', this);

var serverTimeout = this.server.emit('timeout', this);

if (!reqTimeout && !resTimeout && !serverTimeout)

this.destroy();

debug('server socket close');

// mark this parser as reusable

if (socket.parser) {

freeParser(socket.parser, null, socket);

}

abortIncoming(state.incoming);

while (incoming.length) {

var req = incoming.shift();

req.emit('aborted');

req.emit('close');

}

// abort socket._httpMessage ?

var ret = parser.finish();

if (ret instanceof Error) {

debug('parse error');

socketOnError.call(socket, ret);

return;

}

if (!server.httpAllowHalfOpen) {

abortIncoming(state.incoming);

if (socket.writable) socket.end();

} else if (state.outgoing.length) {

state.outgoing[state.outgoing.length - 1]._last = true;

} else if (socket._httpMessage) {

socket._httpMessage._last = true;

} else {

if (socket.writable) socket.end();

}

assert(!socket._paused);

debug('SERVER socketOnData %d', d.length);

var ret = parser.execute(d);

onParserExecuteCommon(server, socket, parser, state, ret, d);

socket._unrefTimer();

debug('SERVER socketOnParserExecute %d', ret);

onParserExecuteCommon(server, socket, parser, state, ret, undefined);

// Ignore further errors

this.removeListener('error', socketOnError);

this.on('error', () => {});

if (!this.server.emit('clientError', e, this))

this.destroy(e);

if (ret instanceof Error) {

debug('parse error');

socketOnError.call(socket, ret);

} else if (parser.incoming && parser.incoming.upgrade) {

// Upgrade or CONNECT

var bytesParsed = ret;

var req = parser.incoming;

debug('SERVER upgrade or connect', req.method);

if (!d)

d = parser.getCurrentBuffer();

socket.removeListener('data', state.onData);

socket.removeListener('end', state.onEnd);

socket.removeListener('close', state.onClose);

socket.removeListener('drain', state.onDrain);

socket.removeListener('drain', ondrain);

unconsume(parser, socket);

parser.finish();

freeParser(parser, req, null);

parser = null;

var eventName = req.method === 'CONNECT' ? 'connect' : 'upgrade';

if (server.listenerCount(eventName) > 0) {

debug('SERVER have listener for %s', eventName);

var bodyHead = d.slice(bytesParsed, d.length);

// TODO(isaacs): Need a way to reset a stream to fresh state

// IE, not flowing, and not explicitly paused.

socket._readableState.flowing = null;

server.emit(eventName, req, socket, bodyHead);

} else {

// Got upgrade header or CONNECT method, but have no handler.

socket.destroy();

}

}

if (socket._paused && socket.parser) {

// onIncoming paused the socket, we should pause the parser as well

debug('pause parser');

socket.parser.pause();

}

// Usually the first incoming element should be our request. it may

// be that in the case abortIncoming() was called that the incoming

// array will be empty.

assert(state.incoming.length === 0 || state.incoming[0] === req);

state.incoming.shift();

// if the user never called req.read(), and didn't pipe() or

// .resume() or .on('data'), then we call req._dump() so that the

// bytes will be pulled off the wire.

if (!req._consuming && !req._readableState.resumeScheduled)

req._dump();

res.detachSocket(socket);

if (res._last) {

socket.destroySoon();

} else {

// start sending the next message

var m = state.outgoing.shift();

if (m) {

m.assignSocket(socket);

}

}

state.incoming.push(req);

// If the writable end isn't consuming, then stop reading

// so that we don't become overwhelmed by a flood of

// pipelined requests that may never be resolved.

if (!socket._paused) {

var ws = socket._writableState;

if (ws.needDrain || state.outgoingData >= ws.highWaterMark) {

socket._paused = true;

// We also need to pause the parser, but don't do that until after

// the call to execute, because we may still be processing the last

// chunk.

socket.pause();

}

}

var res = new ServerResponse(req);

res._onPendingData = updateOutgoingData.bind(undefined, socket, state);

res.shouldKeepAlive = keepAlive;

DTRACE_HTTP_SERVER_REQUEST(req, socket);

LTTNG_HTTP_SERVER_REQUEST(req, socket);

COUNTER_HTTP_SERVER_REQUEST();

if (socket._httpMessage) {

// There are already pending outgoing res, append.

state.outgoing.push(res);

} else {

res.assignSocket(socket);

}

// When we're finished writing the response, check if this is the last

// response, if so destroy the socket.

res.on('finish', resOnFinish.bind(undefined, req, res, socket, state));

if (req.headers.expect !== undefined &&

(req.httpVersionMajor === 1 && req.httpVersionMinor === 1)) {

if (continueExpression.test(req.headers.expect)) {

res._expect_continue = true;

if (server.listenerCount('checkContinue') > 0) {

server.emit('checkContinue', req, res);

} else {

res.writeContinue();

server.emit('request', req, res);

}

} else {

if (server.listenerCount('checkExpectation') > 0) {

server.emit('checkExpectation', req, res);

} else {

res.writeHead(417);

res.end();

}

}

} else {

server.emit('request', req, res);

}

return false; // Not a HEAD response. (Not even a response!)

// It may seem that the socket is resumed, but this is an enemy's trick to

// deceive us! `resume` is emitted asynchronously, and may be called from

// `incoming.readStart()`. Stop the socket again here, just to preserve the

// state.

//

// We don't care about stream semantics for the consumed socket anyway.

if (this._paused) {

this.pause();

return;

}

if (this._handle && !this._handle.reading) {

this._handle.reading = true;

this._handle.readStart();

}

if (this._handle && this._handle.reading) {

this._handle.reading = false;

this._handle.readStop();

}

if (socket._handle) {

if (parser._consumed)

parser.unconsume(socket._handle._externalStream);

parser._consumed = false;

socket.removeListener('pause', onSocketPause);

socket.removeListener('resume', onSocketResume);

}

var res = net.Socket.prototype.on.call(this, ev, fn);

if (!this.parser) {

this.on = net.Socket.prototype.on;

return res;

}

if (ev === 'data' || ev === 'readable')

unconsume(this.parser, this);

return res;