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nodejs/lib/http.js
Ben Noordhuis cb87920ba9 Merge remote-tracking branch 'origin/v0.8' 
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	deps/uv/src/unix/pipe.c
	lib/http.js
	src/node_version.h
2013-02-28 16:58:24 +01:00

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// Copyright Joyent, Inc. and other Node contributors.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to permit
// persons to whom the Software is furnished to do so, subject to the
// following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
// USE OR OTHER DEALINGS IN THE SOFTWARE.
var util = require('util');
var net = require('net');
var Stream = require('stream');
var url = require('url');
var EventEmitter = require('events').EventEmitter;
var FreeList = require('freelist').FreeList;
var HTTPParser = process.binding('http_parser').HTTPParser;
var assert = require('assert').ok;
var debug;
if (process.env.NODE_DEBUG && /http/.test(process.env.NODE_DEBUG)) {
debug = function(x) { console.error('HTTP: %s', x); };
} else {
debug = function() { };
}
function readStart(socket) {
if (!socket || !socket._handle || !socket._handle.readStart) return;
socket._handle.readStart();
}
function readStop(socket) {
if (!socket || !socket._handle || !socket._handle.readStop) return;
socket._handle.readStop();
}
// Only called in the slow case where slow means
// that the request headers were either fragmented
// across multiple TCP packets or too large to be
// processed in a single run. This method is also
// called to process trailing HTTP headers.
function parserOnHeaders(headers, url) {
// Once we exceeded headers limit - stop collecting them
if (this.maxHeaderPairs <= 0 ||
this._headers.length < this.maxHeaderPairs) {
this._headers = this._headers.concat(headers);
}
this._url += url;
}
// info.headers and info.url are set only if .onHeaders()
// has not been called for this request.
//
// info.url is not set for response parsers but that's not
// applicable here since all our parsers are request parsers.
function parserOnHeadersComplete(info) {
var parser = this;
var headers = info.headers;
var url = info.url;
if (!headers) {
headers = parser._headers;
parser._headers = [];
}
if (!url) {
url = parser._url;
parser._url = '';
}
parser.incoming = new IncomingMessage(parser.socket);
parser.incoming.httpVersionMajor = info.versionMajor;
parser.incoming.httpVersionMinor = info.versionMinor;
parser.incoming.httpVersion = info.versionMajor + '.' + info.versionMinor;
parser.incoming.url = url;
var n = headers.length;
// If parser.maxHeaderPairs <= 0 - assume that there're no limit
if (parser.maxHeaderPairs > 0) {
n = Math.min(n, parser.maxHeaderPairs);
}
for (var i = 0; i < n; i += 2) {
var k = headers[i];
var v = headers[i + 1];
parser.incoming._addHeaderLine(k, v);
}
if (info.method) {
// server only
parser.incoming.method = info.method;
} else {
// client only
parser.incoming.statusCode = info.statusCode;
// CHECKME dead code? we're always a request parser
}
parser.incoming.upgrade = info.upgrade;
var skipBody = false; // response to HEAD or CONNECT
if (!info.upgrade) {
// For upgraded connections and CONNECT method request,
// we'll emit this after parser.execute
// so that we can capture the first part of the new protocol
skipBody = parser.onIncoming(parser.incoming, info.shouldKeepAlive);
}
return skipBody;
}
// XXX This is a mess.
// TODO: http.Parser should be a Writable emits request/response events.
function parserOnBody(b, start, len) {
var parser = this;
var stream = parser.incoming;
// if the stream has already been removed, then drop it.
if (!stream)
return;
var socket = stream.socket;
// pretend this was the result of a stream._read call.
if (len > 0 && !stream._dumped) {
var slice = b.slice(start, start + len);
var ret = stream.push(slice);
if (!ret)
readStop(socket);
}
}
function parserOnMessageComplete() {
var parser = this;
var stream = parser.incoming;
if (stream) {
stream.complete = true;
// Emit any trailing headers.
var headers = parser._headers;
if (headers) {
for (var i = 0, n = headers.length; i < n; i += 2) {
var k = headers[i];
var v = headers[i + 1];
parser.incoming._addHeaderLine(k, v);
}
parser._headers = [];
parser._url = '';
}
if (!stream.upgrade)
// For upgraded connections, also emit this after parser.execute
stream.push(null);
}
if (stream && !parser.incoming._pendings.length) {
// For emit end event
stream.push(null);
}
if (parser.socket.readable) {
// force to read the next incoming message
readStart(parser.socket);
}
}
var parsers = new FreeList('parsers', 1000, function() {
var parser = new HTTPParser(HTTPParser.REQUEST);
parser._headers = [];
parser._url = '';
// Only called in the slow case where slow means
// that the request headers were either fragmented
// across multiple TCP packets or too large to be
// processed in a single run. This method is also
// called to process trailing HTTP headers.
parser.onHeaders = parserOnHeaders;
parser.onHeadersComplete = parserOnHeadersComplete;
parser.onBody = parserOnBody;
parser.onMessageComplete = parserOnMessageComplete;
return parser;
});
exports.parsers = parsers;
var CRLF = '\r\n';
var STATUS_CODES = exports.STATUS_CODES = {
100 : 'Continue',
101 : 'Switching Protocols',
102 : 'Processing', // RFC 2518, obsoleted by RFC 4918
200 : 'OK',
201 : 'Created',
202 : 'Accepted',
203 : 'Non-Authoritative Information',
204 : 'No Content',
205 : 'Reset Content',
206 : 'Partial Content',
207 : 'Multi-Status', // RFC 4918
300 : 'Multiple Choices',
301 : 'Moved Permanently',
302 : 'Moved Temporarily',
303 : 'See Other',
304 : 'Not Modified',
305 : 'Use Proxy',
307 : 'Temporary Redirect',
400 : 'Bad Request',
401 : 'Unauthorized',
402 : 'Payment Required',
403 : 'Forbidden',
404 : 'Not Found',
405 : 'Method Not Allowed',
406 : 'Not Acceptable',
407 : 'Proxy Authentication Required',
408 : 'Request Time-out',
409 : 'Conflict',
410 : 'Gone',
411 : 'Length Required',
412 : 'Precondition Failed',
413 : 'Request Entity Too Large',
414 : 'Request-URI Too Large',
415 : 'Unsupported Media Type',
416 : 'Requested Range Not Satisfiable',
417 : 'Expectation Failed',
418 : 'I\'m a teapot', // RFC 2324
422 : 'Unprocessable Entity', // RFC 4918
423 : 'Locked', // RFC 4918
424 : 'Failed Dependency', // RFC 4918
425 : 'Unordered Collection', // RFC 4918
426 : 'Upgrade Required', // RFC 2817
428 : 'Precondition Required', // RFC 6585
429 : 'Too Many Requests', // RFC 6585
431 : 'Request Header Fields Too Large',// RFC 6585
500 : 'Internal Server Error',
501 : 'Not Implemented',
502 : 'Bad Gateway',
503 : 'Service Unavailable',
504 : 'Gateway Time-out',
505 : 'HTTP Version Not Supported',
506 : 'Variant Also Negotiates', // RFC 2295
507 : 'Insufficient Storage', // RFC 4918
509 : 'Bandwidth Limit Exceeded',
510 : 'Not Extended', // RFC 2774
511 : 'Network Authentication Required' // RFC 6585
};
var connectionExpression = /Connection/i;
var transferEncodingExpression = /Transfer-Encoding/i;
var closeExpression = /close/i;
var chunkExpression = /chunk/i;
var contentLengthExpression = /Content-Length/i;
var dateExpression = /Date/i;
var expectExpression = /Expect/i;
var continueExpression = /100-continue/i;
var dateCache;
function utcDate() {
if (!dateCache) {
var d = new Date();
dateCache = d.toUTCString();
setTimeout(function() {
dateCache = undefined;
}, 1000 - d.getMilliseconds());
}
return dateCache;
}
/* Abstract base class for ServerRequest and ClientResponse. */
function IncomingMessage(socket) {
Stream.Readable.call(this);
// XXX This implementation is kind of all over the place
// When the parser emits body chunks, they go in this list.
// _read() pulls them out, and when it finds EOF, it ends.
this.socket = socket;
this.connection = socket;
this.httpVersion = null;
this.complete = false;
this.headers = {};
this.trailers = {};
this.readable = true;
this._pendings = [];
this._pendingIndex = 0;
// request (server) only
this.url = '';
this.method = null;
// response (client) only
this.statusCode = null;
this.client = this.socket;
// flag for backwards compatibility grossness.
this._consuming = false;
// flag for when we decide that this message cannot possibly be
// read by the user, so there's no point continuing to handle it.
this._dumped = false;
}
util.inherits(IncomingMessage, Stream.Readable);
exports.IncomingMessage = IncomingMessage;
IncomingMessage.prototype.read = function(n) {
this._consuming = true;
this.read = Stream.Readable.prototype.read;
return this.read(n);
};
IncomingMessage.prototype._read = function(n, callback) {
// We actually do almost nothing here, because the parserOnBody
// function fills up our internal buffer directly. However, we
// do need to unpause the underlying socket so that it flows.
if (!this.socket.readable)
return callback(null, null);
else
readStart(this.socket);
};
IncomingMessage.prototype.destroy = function(error) {
this.socket.destroy(error);
};
// Add the given (field, value) pair to the message
//
// Per RFC2616, section 4.2 it is acceptable to join multiple instances of the
// same header with a ', ' if the header in question supports specification of
// multiple values this way. If not, we declare the first instance the winner
// and drop the second. Extended header fields (those beginning with 'x-') are
// always joined.
IncomingMessage.prototype._addHeaderLine = function(field, value) {
var dest = this.complete ? this.trailers : this.headers;
field = field.toLowerCase();
switch (field) {
// Array headers:
case 'set-cookie':
if (dest[field] !== undefined) {
dest[field].push(value);
} else {
dest[field] = [value];
}
break;
// Comma separate. Maybe make these arrays?
case 'accept':
case 'accept-charset':
case 'accept-encoding':
case 'accept-language':
case 'connection':
case 'cookie':
case 'pragma':
case 'link':
case 'www-authenticate':
case 'proxy-authenticate':
case 'sec-websocket-extensions':
case 'sec-websocket-protocol':
if (dest[field] !== undefined) {
dest[field] += ', ' + value;
} else {
dest[field] = value;
}
break;
default:
if (field.slice(0, 2) == 'x-') {
// except for x-
if (dest[field] !== undefined) {
dest[field] += ', ' + value;
} else {
dest[field] = value;
}
} else {
// drop duplicates
if (dest[field] === undefined) dest[field] = value;
}
break;
}
};
// Call this instead of resume() if we want to just
// dump all the data to /dev/null
IncomingMessage.prototype._dump = function() {
if (this._dumped)
return;
this._dumped = true;
this.socket.parser.incoming = null;
this.push(null);
readStart(this.socket);
};
function OutgoingMessage() {
Stream.call(this);
this.output = [];
this.outputEncodings = [];
this.writable = true;
this._last = false;
this.chunkedEncoding = false;
this.shouldKeepAlive = true;
this.useChunkedEncodingByDefault = true;
this.sendDate = false;
this._hasBody = true;
this._trailer = '';
this.finished = false;
this._hangupClose = false;
}
util.inherits(OutgoingMessage, Stream);
exports.OutgoingMessage = OutgoingMessage;
OutgoingMessage.prototype.destroy = function(error) {
this.socket.destroy(error);
};
// This abstract either writing directly to the socket or buffering it.
OutgoingMessage.prototype._send = function(data, encoding) {
// This is a shameful hack to get the headers and first body chunk onto
// the same packet. Future versions of Node are going to take care of
// this at a lower level and in a more general way.
if (!this._headerSent) {
if (typeof data === 'string') {
data = this._header + data;
} else {
this.output.unshift(this._header);
this.outputEncodings.unshift('ascii');
}
this._headerSent = true;
}
return this._writeRaw(data, encoding);
};
OutgoingMessage.prototype._writeRaw = function(data, encoding) {
if (data.length === 0) {
return true;
}
if (this.connection &&
this.connection._httpMessage === this &&
this.connection.writable &&
!this.connection.destroyed) {
// There might be pending data in the this.output buffer.
while (this.output.length) {
if (!this.connection.writable) {
this._buffer(data, encoding);
return false;
}
var c = this.output.shift();
var e = this.outputEncodings.shift();
this.connection.write(c, e);
}
// Directly write to socket.
return this.connection.write(data, encoding);
} else if (this.connection && this.connection.destroyed) {
// The socket was destroyed. If we're still trying to write to it,
// then something bad happened, but it could be just that we haven't
// gotten the 'close' event yet.
//
// In v0.10 and later, this isn't a problem, since ECONNRESET isn't
// ignored in the first place. We'll probably emit 'close' on the
// next tick, but just in case it's not coming, set a timeout that
// will emit it for us.
if (!this._hangupClose) {
this._hangupClose = true;
var socket = this.socket;
var timer = setTimeout(function() {
socket.emit('close');
});
socket.on('close', function() {
clearTimeout(timer);
});
}
return false;
} else {
// buffer, as long as we're not destroyed.
this._buffer(data, encoding);
return false;
}
};
OutgoingMessage.prototype._buffer = function(data, encoding) {
if (data.length === 0) return;
var length = this.output.length;
if (length === 0 || typeof data != 'string') {
this.output.push(data);
this.outputEncodings.push(encoding);
return false;
}
var lastEncoding = this.outputEncodings[length - 1];
var lastData = this.output[length - 1];
if ((encoding && lastEncoding === encoding) ||
(!encoding && data.constructor === lastData.constructor)) {
this.output[length - 1] = lastData + data;
return false;
}
this.output.push(data);
this.outputEncodings.push(encoding);
return false;
};
OutgoingMessage.prototype._storeHeader = function(firstLine, headers) {
// firstLine in the case of request is: 'GET /index.html HTTP/1.1\r\n'
// in the case of response it is: 'HTTP/1.1 200 OK\r\n'
var state = {
sentConnectionHeader: false,
sentContentLengthHeader: false,
sentTransferEncodingHeader: false,
sentDateHeader: false,
sentExpect: false,
messageHeader: firstLine
};
var field, value;
var self = this;
if (headers) {
var keys = Object.keys(headers);
var isArray = (Array.isArray(headers));
var field, value;
for (var i = 0, l = keys.length; i < l; i++) {
var key = keys[i];
if (isArray) {
field = headers[key][0];
value = headers[key][1];
} else {
field = key;
value = headers[key];
}
if (Array.isArray(value)) {
for (var j = 0; j < value.length; j++) {
storeHeader(this, state, field, value[j]);
}
} else {
storeHeader(this, state, field, value);
}
}
}
// Date header
if (this.sendDate == true && state.sentDateHeader == false) {
state.messageHeader += 'Date: ' + utcDate() + CRLF;
}
// Force the connection to close when the response is a 204 No Content or
// a 304 Not Modified and the user has set a "Transfer-Encoding: chunked"
// header.
//
// RFC 2616 mandates that 204 and 304 responses MUST NOT have a body but
// node.js used to send out a zero chunk anyway to accommodate clients
// that don't have special handling for those responses.
//
// It was pointed out that this might confuse reverse proxies to the point
// of creating security liabilities, so suppress the zero chunk and force
// the connection to close.
var statusCode = this.statusCode;
if ((statusCode == 204 || statusCode === 304) &&
this.chunkedEncoding === true) {
debug(statusCode + ' response should not use chunked encoding,' +
' closing connection.');
this.chunkedEncoding = false;
this.shouldKeepAlive = false;
}
// keep-alive logic
if (state.sentConnectionHeader === false) {
var shouldSendKeepAlive = this.shouldKeepAlive &&
(state.sentContentLengthHeader ||
this.useChunkedEncodingByDefault ||
this.agent);
if (shouldSendKeepAlive) {
state.messageHeader += 'Connection: keep-alive\r\n';
} else {
this._last = true;
state.messageHeader += 'Connection: close\r\n';
}
}
if (state.sentContentLengthHeader == false &&
state.sentTransferEncodingHeader == false) {
if (this._hasBody) {
if (this.useChunkedEncodingByDefault) {
state.messageHeader += 'Transfer-Encoding: chunked\r\n';
this.chunkedEncoding = true;
} else {
this._last = true;
}
} else {
// Make sure we don't end the 0\r\n\r\n at the end of the message.
this.chunkedEncoding = false;
}
}
this._header = state.messageHeader + CRLF;
this._headerSent = false;
// wait until the first body chunk, or close(), is sent to flush,
// UNLESS we're sending Expect: 100-continue.
if (state.sentExpect) this._send('');
};
function storeHeader(self, state, field, value) {
// Protect against response splitting. The if statement is there to
// minimize the performance impact in the common case.
if (/[\r\n]/.test(value))
value = value.replace(/[\r\n]+[ \t]*/g, '');
state.messageHeader += field + ': ' + value + CRLF;
if (connectionExpression.test(field)) {
state.sentConnectionHeader = true;
if (closeExpression.test(value)) {
self._last = true;
} else {
self.shouldKeepAlive = true;
}
} else if (transferEncodingExpression.test(field)) {
state.sentTransferEncodingHeader = true;
if (chunkExpression.test(value)) self.chunkedEncoding = true;
} else if (contentLengthExpression.test(field)) {
state.sentContentLengthHeader = true;
} else if (dateExpression.test(field)) {
state.sentDateHeader = true;
} else if (expectExpression.test(field)) {
state.sentExpect = true;
}
}
OutgoingMessage.prototype.setHeader = function(name, value) {
if (arguments.length < 2) {
throw new Error('`name` and `value` are required for setHeader().');
}
if (this._header) {
throw new Error('Can\'t set headers after they are sent.');
}
var key = name.toLowerCase();
this._headers = this._headers || {};
this._headerNames = this._headerNames || {};
this._headers[key] = value;
this._headerNames[key] = name;
};
OutgoingMessage.prototype.getHeader = function(name) {
if (arguments.length < 1) {
throw new Error('`name` is required for getHeader().');
}
if (!this._headers) return;
var key = name.toLowerCase();
return this._headers[key];
};
OutgoingMessage.prototype.removeHeader = function(name) {
if (arguments.length < 1) {
throw new Error('`name` is required for removeHeader().');
}
if (this._header) {
throw new Error('Can\'t remove headers after they are sent.');
}
if (!this._headers) return;
var key = name.toLowerCase();
delete this._headers[key];
delete this._headerNames[key];
};
OutgoingMessage.prototype._renderHeaders = function() {
if (this._header) {
throw new Error('Can\'t render headers after they are sent to the client.');
}
if (!this._headers) return {};
var headers = {};
var keys = Object.keys(this._headers);
for (var i = 0, l = keys.length; i < l; i++) {
var key = keys[i];
headers[this._headerNames[key]] = this._headers[key];
}
return headers;
};
Object.defineProperty(OutgoingMessage.prototype, 'headersSent', {
configurable: true,
enumerable: true,
get: function() { return !!this._header; }
});
OutgoingMessage.prototype.write = function(chunk, encoding) {
if (!this._header) {
this._implicitHeader();
}
if (!this._hasBody) {
debug('This type of response MUST NOT have a body. ' +
'Ignoring write() calls.');
return true;
}
if (typeof chunk !== 'string' && !Buffer.isBuffer(chunk)) {
throw new TypeError('first argument must be a string or Buffer');
}
if (chunk.length === 0) return false;
var len, ret;
if (this.chunkedEncoding) {
if (typeof(chunk) === 'string') {
len = Buffer.byteLength(chunk, encoding);
chunk = len.toString(16) + CRLF + chunk + CRLF;
ret = this._send(chunk, encoding);
} else {
// buffer
len = chunk.length;
this._send(len.toString(16) + CRLF);
this._send(chunk);
ret = this._send(CRLF);
}
} else {
ret = this._send(chunk, encoding);
}
debug('write ret = ' + ret);
return ret;
};
OutgoingMessage.prototype.addTrailers = function(headers) {
this._trailer = '';
var keys = Object.keys(headers);
var isArray = (Array.isArray(headers));
var field, value;
for (var i = 0, l = keys.length; i < l; i++) {
var key = keys[i];
if (isArray) {
field = headers[key][0];
value = headers[key][1];
} else {
field = key;
value = headers[key];
}
this._trailer += field + ': ' + value + CRLF;
}
};
var zero_chunk_buf = new Buffer('\r\n0\r\n');
var crlf_buf = new Buffer('\r\n');
OutgoingMessage.prototype.end = function(data, encoding) {
if (this.finished) {
return false;
}
if (!this._header) {
this._implicitHeader();
}
if (data && !this._hasBody) {
debug('This type of response MUST NOT have a body. ' +
'Ignoring data passed to end().');
data = false;
}
var ret;
var hot = this._headerSent === false &&
(data && data.length > 0) &&
this.output.length === 0 &&
this.connection &&
this.connection.writable &&
this.connection._httpMessage === this;
if (hot) {
// Hot path. They're doing
// res.writeHead();
// res.end(blah);
// HACKY.
if (typeof data === 'string') {
if (this.chunkedEncoding) {
var l = Buffer.byteLength(data, encoding).toString(16);
ret = this.connection.write(this._header + l + CRLF +
data + '\r\n0\r\n' +
this._trailer + '\r\n', encoding);
} else {
ret = this.connection.write(this._header + data, encoding);
}
} else if (Buffer.isBuffer(data)) {
if (this.chunkedEncoding) {
var chunk_size = data.length.toString(16);
// Skip expensive Buffer.byteLength() calls; only ISO-8859-1 characters
// are allowed in HTTP headers. Therefore:
//
// this._header.length == Buffer.byteLength(this._header.length)
// this._trailer.length == Buffer.byteLength(this._trailer.length)
//
var header_len = this._header.length;
var chunk_size_len = chunk_size.length;
var data_len = data.length;
var trailer_len = this._trailer.length;
var len = header_len +
chunk_size_len +
2 + // '\r\n'.length
data_len +
5 + // '\r\n0\r\n'.length
trailer_len +
2; // '\r\n'.length
var buf = new Buffer(len);
var off = 0;
buf.write(this._header, off, header_len, 'ascii');
off += header_len;
buf.write(chunk_size, off, chunk_size_len, 'ascii');
off += chunk_size_len;
crlf_buf.copy(buf, off);
off += 2;
data.copy(buf, off);
off += data_len;
zero_chunk_buf.copy(buf, off);
off += 5;
if (trailer_len > 0) {
buf.write(this._trailer, off, trailer_len, 'ascii');
off += trailer_len;
}
crlf_buf.copy(buf, off);
ret = this.connection.write(buf);
} else {
var header_len = this._header.length;
var buf = new Buffer(header_len + data.length);
buf.write(this._header, 0, header_len, 'ascii');
data.copy(buf, header_len);
ret = this.connection.write(buf);
}
} else {
throw new TypeError('first argument must be a string or Buffer');
}
this._headerSent = true;
} else if (data) {
// Normal body write.
ret = this.write(data, encoding);
}
if (!hot) {
if (this.chunkedEncoding) {
ret = this._send('0\r\n' + this._trailer + '\r\n'); // Last chunk.
} else {
// Force a flush, HACK.
ret = this._send('');
}
}
this.finished = true;
// There is the first message on the outgoing queue, and we've sent
// everything to the socket.
debug('outgoing message end.');
if (this.output.length === 0 && this.connection._httpMessage === this) {
this._finish();
}
return ret;
};
OutgoingMessage.prototype._finish = function() {
assert(this.connection);
if (this instanceof ServerResponse) {
DTRACE_HTTP_SERVER_RESPONSE(this.connection);
COUNTER_HTTP_SERVER_RESPONSE();
} else {
assert(this instanceof ClientRequest);
DTRACE_HTTP_CLIENT_REQUEST(this, this.connection);
COUNTER_HTTP_CLIENT_REQUEST();
}
this.emit('finish');
};
OutgoingMessage.prototype._flush = function() {
// This logic is probably a bit confusing. Let me explain a bit:
//
// In both HTTP servers and clients it is possible to queue up several
// outgoing messages. This is easiest to imagine in the case of a client.
// Take the following situation:
//
// req1 = client.request('GET', '/');
// req2 = client.request('POST', '/');
//
// When the user does
//
// req2.write('hello world\n');
//
// it's possible that the first request has not been completely flushed to
// the socket yet. Thus the outgoing messages need to be prepared to queue
// up data internally before sending it on further to the socket's queue.
//
// This function, outgoingFlush(), is called by both the Server and Client
// to attempt to flush any pending messages out to the socket.
if (!this.socket) return;
var ret;
while (this.output.length) {
if (!this.socket.writable) return; // XXX Necessary?
var data = this.output.shift();
var encoding = this.outputEncodings.shift();
ret = this.socket.write(data, encoding);
}
if (this.finished) {
// This is a queue to the server or client to bring in the next this.
this._finish();
} else if (ret) {
// This is necessary to prevent https from breaking
this.emit('drain');
}
};
function ServerResponse(req) {
OutgoingMessage.call(this);
if (req.method === 'HEAD') this._hasBody = false;
this.sendDate = true;
if (req.httpVersionMajor < 1 || req.httpVersionMinor < 1) {
this.useChunkedEncodingByDefault = chunkExpression.test(req.headers.te);
this.shouldKeepAlive = false;
}
}
util.inherits(ServerResponse, OutgoingMessage);
exports.ServerResponse = ServerResponse;
ServerResponse.prototype.statusCode = 200;
function onServerResponseClose() {
// 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 obj = new events.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');
}
ServerResponse.prototype.assignSocket = function(socket) {
assert(!socket._httpMessage);
socket._httpMessage = this;
socket.on('close', onServerResponseClose);
this.socket = socket;
this.connection = socket;
this._flush();
};
ServerResponse.prototype.detachSocket = function(socket) {
assert(socket._httpMessage == this);
socket.removeListener('close', onServerResponseClose);
socket._httpMessage = null;
this.socket = this.connection = null;
};
ServerResponse.prototype.writeContinue = function() {
this._writeRaw('HTTP/1.1 100 Continue' + CRLF + CRLF, 'ascii');
this._sent100 = true;
};
ServerResponse.prototype._implicitHeader = function() {
this.writeHead(this.statusCode);
};
ServerResponse.prototype.writeHead = function(statusCode) {
var reasonPhrase, headers, headerIndex;
if (typeof arguments[1] == 'string') {
reasonPhrase = arguments[1];
headerIndex = 2;
} else {
reasonPhrase = STATUS_CODES[statusCode] || 'unknown';
headerIndex = 1;
}
this.statusCode = statusCode;
var obj = arguments[headerIndex];
if (obj && this._headers) {
// Slow-case: when progressive API and header fields are passed.
headers = this._renderHeaders();
if (Array.isArray(obj)) {
// handle array case
// TODO: remove when array is no longer accepted
var field;
for (var i = 0, len = obj.length; i < len; ++i) {
field = obj[i][0];
if (headers[field] !== undefined) {
obj.push([field, headers[field]]);
}
}
headers = obj;
} else {
// handle object case
var keys = Object.keys(obj);
for (var i = 0; i < keys.length; i++) {
var k = keys[i];
if (k) headers[k] = obj[k];
}
}
} else if (this._headers) {
// only progressive api is used
headers = this._renderHeaders();
} else {
// only writeHead() called
headers = obj;
}
var statusLine = 'HTTP/1.1 ' + statusCode.toString() + ' ' +
reasonPhrase + CRLF;
if (statusCode === 204 || statusCode === 304 ||
(100 <= statusCode && 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);
};
ServerResponse.prototype.writeHeader = function() {
this.writeHead.apply(this, arguments);
};
// New Agent code.
// The largest departure from the previous implementation is that
// an Agent instance holds connections for a variable number of host:ports.
// Surprisingly, this is still API compatible as far as third parties are
// concerned. The only code that really notices the difference is the
// request object.
// Another departure is that all code related to HTTP parsing is in
// ClientRequest.onSocket(). The Agent is now *strictly*
// concerned with managing a connection pool.
function Agent(options) {
EventEmitter.call(this);
var self = this;
self.options = options || {};
self.requests = {};
self.sockets = {};
self.maxSockets = self.options.maxSockets || Agent.defaultMaxSockets;
self.on('free', function(socket, host, port, localAddress) {
var name = host + ':' + port;
if (localAddress) {
name += ':' + localAddress;
}
if (!socket.destroyed &&
self.requests[name] && self.requests[name].length) {
self.requests[name].shift().onSocket(socket);
if (self.requests[name].length === 0) {
// don't leak
delete self.requests[name];
}
} else {
// If there are no pending requests just destroy the
// socket and it will get removed from the pool. This
// gets us out of timeout issues and allows us to
// default to Connection:keep-alive.
socket.destroy();
}
});
self.createConnection = net.createConnection;
}
util.inherits(Agent, EventEmitter);
exports.Agent = Agent;
Agent.defaultMaxSockets = 5;
Agent.prototype.defaultPort = 80;
Agent.prototype.addRequest = function(req, host, port, localAddress) {
var name = host + ':' + port;
if (localAddress) {
name += ':' + localAddress;
}
if (!this.sockets[name]) {
this.sockets[name] = [];
}
if (this.sockets[name].length < this.maxSockets) {
// If we are under maxSockets create a new one.
req.onSocket(this.createSocket(name, host, port, localAddress, req));
} else {
// We are over limit so we'll add it to the queue.
if (!this.requests[name]) {
this.requests[name] = [];
}
this.requests[name].push(req);
}
};
Agent.prototype.createSocket = function(name, host, port, localAddress, req) {
var self = this;
var options = util._extend({}, self.options);
options.port = port;
options.host = host;
options.localAddress = localAddress;
options.servername = host;
if (req) {
var hostHeader = req.getHeader('host');
if (hostHeader) {
options.servername = hostHeader.replace(/:.*$/, '');
}
}
var s = self.createConnection(options);
if (!self.sockets[name]) {
self.sockets[name] = [];
}
this.sockets[name].push(s);
var onFree = function() {
self.emit('free', s, host, port, localAddress);
}
s.on('free', onFree);
var onClose = function(err) {
// This is the only place where sockets get removed from the Agent.
// If you want to remove a socket from the pool, just close it.
// All socket errors end in a close event anyway.
self.removeSocket(s, name, host, port, localAddress);
}
s.on('close', onClose);
var onRemove = function() {
// We need this function for cases like HTTP 'upgrade'
// (defined by WebSockets) where we need to remove a socket from the pool
// because it'll be locked up indefinitely
self.removeSocket(s, name, host, port, localAddress);
s.removeListener('close', onClose);
s.removeListener('free', onFree);
s.removeListener('agentRemove', onRemove);
}
s.on('agentRemove', onRemove);
return s;
};
Agent.prototype.removeSocket = function(s, name, host, port, localAddress) {
if (this.sockets[name]) {
var index = this.sockets[name].indexOf(s);
if (index !== -1) {
this.sockets[name].splice(index, 1);
if (this.sockets[name].length === 0) {
// don't leak
delete this.sockets[name];
}
}
}
if (this.requests[name] && this.requests[name].length) {
var req = this.requests[name][0];
// If we have pending requests and a socket gets closed a new one
this.createSocket(name, host, port, localAddress, req).emit('free');
}
};
var globalAgent = new Agent();
exports.globalAgent = globalAgent;
function ClientRequest(options, cb) {
var self = this;
OutgoingMessage.call(self);
self.agent = options.agent === undefined ? globalAgent : options.agent;
var defaultPort = options.defaultPort || 80;
var port = options.port || defaultPort;
var host = options.hostname || options.host || 'localhost';
if (options.setHost === undefined) {
var setHost = true;
}
self.socketPath = options.socketPath;
var method = self.method = (options.method || 'GET').toUpperCase();
self.path = options.path || '/';
if (cb) {
self.once('response', cb);
}
if (!Array.isArray(options.headers)) {
if (options.headers) {
var keys = Object.keys(options.headers);
for (var i = 0, l = keys.length; i < l; i++) {
var key = keys[i];
self.setHeader(key, options.headers[key]);
}
}
if (host && !this.getHeader('host') && setHost) {
var hostHeader = host;
if (port && +port !== defaultPort) {
hostHeader += ':' + port;
}
this.setHeader('Host', hostHeader);
}
}
if (options.auth && !this.getHeader('Authorization')) {
//basic auth
this.setHeader('Authorization', 'Basic ' +
new Buffer(options.auth).toString('base64'));
}
if (method === 'GET' || method === 'HEAD' || method === 'CONNECT') {
self.useChunkedEncodingByDefault = false;
} else {
self.useChunkedEncodingByDefault = true;
}
if (Array.isArray(options.headers)) {
self._storeHeader(self.method + ' ' + self.path + ' HTTP/1.1\r\n',
options.headers);
} else if (self.getHeader('expect')) {
self._storeHeader(self.method + ' ' + self.path + ' HTTP/1.1\r\n',
self._renderHeaders());
}
if (self.socketPath) {
self._last = true;
self.shouldKeepAlive = false;
if (options.createConnection) {
self.onSocket(options.createConnection(self.socketPath));
} else {
self.onSocket(net.createConnection(self.socketPath));
}
} else if (self.agent) {
// If there is an agent we should default to Connection:keep-alive.
self._last = false;
self.shouldKeepAlive = true;
self.agent.addRequest(self, host, port, options.localAddress);
} else {
// No agent, default to Connection:close.
self._last = true;
self.shouldKeepAlive = false;
if (options.createConnection) {
options.port = port;
options.host = host;
var conn = options.createConnection(options);
} else {
var conn = net.createConnection({
port: port,
host: host,
localAddress: options.localAddress
});
}
self.onSocket(conn);
}
self._deferToConnect(null, null, function() {
self._flush();
self = null;
});
}
util.inherits(ClientRequest, OutgoingMessage);
exports.ClientRequest = ClientRequest;
ClientRequest.prototype._implicitHeader = function() {
this._storeHeader(this.method + ' ' + this.path + ' HTTP/1.1\r\n',
this._renderHeaders());
};
ClientRequest.prototype.abort = function() {
if (this.socket) {
// in-progress
this.socket.destroy();
} else {
// haven't been assigned a socket yet.
// this could be more efficient, it could
// remove itself from the pending requests
this._deferToConnect('destroy', []);
}
};
function createHangUpError() {
var error = new Error('socket hang up');
error.code = 'ECONNRESET';
return error;
}
// Free the parser and also break any links that it
// might have to any other things.
// TODO: All parser data should be attached to a
// single object, so that it can be easily cleaned
// up by doing `parser.data = {}`, which should
// be done in FreeList.free. `parsers.free(parser)`
// should be all that is needed.
function freeParser(parser, req) {
if (parser) {
parser._headers = [];
parser.onIncoming = null;
if (parser.socket) {
parser.socket.onend = null;
parser.socket.ondata = null;
parser.socket.parser = null;
}
parser.socket = null;
parser.incoming = null;
parsers.free(parser);
parser = null;
}
if (req) {
req.parser = null;
}
}
function socketCloseListener() {
var socket = this;
var parser = socket.parser;
var req = socket._httpMessage;
debug('HTTP socket close');
req.emit('close');
if (req.res && req.res.readable) {
// Socket closed before we emitted 'end' below.
req.res.emit('aborted');
var res = req.res;
res.on('end', function() {
res.emit('close');
});
res.push(null);
} else if (!req.res && !req._hadError) {
// This socket error fired before we started to
// receive a response. The error needs to
// fire on the request.
req.emit('error', createHangUpError());
req._hadError = true;
}
// Too bad. That output wasn't getting written.
// This is pretty terrible that it doesn't raise an error.
// Fixed better in v0.10
if (req.output)
req.output.length = 0;
if (req.outputEncodings)
req.outputEncodings.length = 0;
if (parser) {
parser.finish();
freeParser(parser, req);
}
}
function socketErrorListener(err) {
var socket = this;
var parser = socket.parser;
var req = socket._httpMessage;
debug('HTTP SOCKET ERROR: ' + err.message + '\n' + err.stack);
if (req) {
req.emit('error', err);
// For Safety. Some additional errors might fire later on
// and we need to make sure we don't double-fire the error event.
req._hadError = true;
}
if (parser) {
parser.finish();
freeParser(parser, req);
}
socket.destroy();
}
function socketOnEnd() {
var socket = this;
var req = this._httpMessage;
var parser = this.parser;
if (!req.res) {
// If we don't have a response then we know that the socket
// ended prematurely and we need to emit an error on the request.
req.emit('error', createHangUpError());
req._hadError = true;
}
if (parser) {
parser.finish();
freeParser(parser, req);
}
socket.destroy();
}
function socketOnData(d, start, end) {
var socket = this;
var req = this._httpMessage;
var parser = this.parser;
var ret = parser.execute(d, start, end - start);
if (ret instanceof Error) {
debug('parse error');
freeParser(parser, req);
socket.destroy();
req.emit('error', ret);
req._hadError = true;
} else if (parser.incoming && parser.incoming.upgrade) {
// Upgrade or CONNECT
var bytesParsed = ret;
var res = parser.incoming;
req.res = res;
socket.ondata = null;
socket.onend = null;
parser.finish();
// This is start + byteParsed
var bodyHead = d.slice(start + bytesParsed, end);
var eventName = req.method === 'CONNECT' ? 'connect' : 'upgrade';
if (req.listeners(eventName).length) {
req.upgradeOrConnect = true;
// detach the socket
socket.emit('agentRemove');
socket.removeListener('close', socketCloseListener);
socket.removeListener('error', socketErrorListener);
req.emit(eventName, res, socket, bodyHead);
req.emit('close');
} else {
// Got Upgrade header or CONNECT method, but have no handler.
socket.destroy();
}
freeParser(parser, req);
} else if (parser.incoming && parser.incoming.complete &&
// When the status code is 100 (Continue), the server will
// send a final response after this client sends a request
// body. So, we must not free the parser.
parser.incoming.statusCode !== 100) {
freeParser(parser, req);
}
}
// client
function parserOnIncomingClient(res, shouldKeepAlive) {
var parser = this;
var socket = this.socket;
var req = socket._httpMessage;
// propogate "domain" setting...
if (req.domain && !res.domain) {
debug('setting "res.domain"');
res.domain = req.domain;
}
debug('AGENT incoming response!');
if (req.res) {
// We already have a response object, this means the server
// sent a double response.
socket.destroy();
return;
}
req.res = res;
// Responses to CONNECT request is handled as Upgrade.
if (req.method === 'CONNECT') {
res.upgrade = true;
return true; // skip body
}
// Responses to HEAD requests are crazy.
// HEAD responses aren't allowed to have an entity-body
// but *can* have a content-length which actually corresponds
// to the content-length of the entity-body had the request
// been a GET.
var isHeadResponse = req.method == 'HEAD';
debug('AGENT isHeadResponse ' + isHeadResponse);
if (res.statusCode == 100) {
// restart the parser, as this is a continue message.
delete req.res; // Clear res so that we don't hit double-responses.
req.emit('continue');
return true;
}
if (req.shouldKeepAlive && !shouldKeepAlive && !req.upgradeOrConnect) {
// Server MUST respond with Connection:keep-alive for us to enable it.
// If we've been upgraded (via WebSockets) we also shouldn't try to
// keep the connection open.
req.shouldKeepAlive = false;
}
DTRACE_HTTP_CLIENT_RESPONSE(socket, req);
COUNTER_HTTP_CLIENT_RESPONSE();
req.res = res;
res.req = req;
var handled = req.emit('response', res);
res.on('end', responseOnEnd);
// If the user did not listen for the 'response' event, then they
// can't possibly read the data, so we ._dump() it into the void
// so that the socket doesn't hang there in a paused state.
if (!handled)
res._dump();
return isHeadResponse;
}
// client
function responseOnEnd() {
var res = this;
var req = res.req;
var socket = req.socket;
if (!req.shouldKeepAlive) {
if (socket.writable) {
debug('AGENT socket.destroySoon()');
socket.destroySoon();
}
assert(!socket.writable);
} else {
debug('AGENT socket keep-alive');
if (req.timeoutCb) {
socket.setTimeout(0, req.timeoutCb);
req.timeoutCb = null;
}
socket.removeListener('close', socketCloseListener);
socket.removeListener('error', socketErrorListener);
socket.emit('free');
}
}
ClientRequest.prototype.onSocket = function(socket) {
var req = this;
process.nextTick(function() {
var parser = parsers.alloc();
req.socket = socket;
req.connection = socket;
parser.reinitialize(HTTPParser.RESPONSE);
parser.socket = socket;
parser.incoming = null;
req.parser = parser;
socket.parser = parser;
socket._httpMessage = req;
// Setup "drain" propogation.
httpSocketSetup(socket);
// Propagate headers limit from request object to parser
if (typeof req.maxHeadersCount === 'number') {
parser.maxHeaderPairs = req.maxHeadersCount << 1;
} else {
// Set default value because parser may be reused from FreeList
parser.maxHeaderPairs = 2000;
}
socket.on('error', socketErrorListener);
socket.ondata = socketOnData;
socket.onend = socketOnEnd;
socket.on('close', socketCloseListener);
parser.onIncoming = parserOnIncomingClient;
req.emit('socket', socket);
});
};
ClientRequest.prototype._deferToConnect = function(method, arguments_, cb) {
// This function is for calls that need to happen once the socket is
// connected and writable. It's an important promisy thing for all the socket
// calls that happen either now (when a socket is assigned) or
// in the future (when a socket gets assigned out of the pool and is
// eventually writable).
var self = this;
var onSocket = function() {
if (self.socket.writable) {
if (method) {
self.socket[method].apply(self.socket, arguments_);
}
if (cb) { cb(); }
} else {
self.socket.once('connect', function() {
if (method) {
self.socket[method].apply(self.socket, arguments_);
}
if (cb) { cb(); }
});
}
}
if (!self.socket) {
self.once('socket', onSocket);
} else {
onSocket();
}
};
ClientRequest.prototype.setTimeout = function(msecs, callback) {
if (callback) this.once('timeout', callback);
var self = this;
function emitTimeout() {
self.emit('timeout');
}
if (this.socket && this.socket.writable) {
if (this.timeoutCb)
this.socket.setTimeout(0, this.timeoutCb);
this.timeoutCb = emitTimeout;
this.socket.setTimeout(msecs, emitTimeout);
return;
}
if (this.socket) {
this.socket.once('connect', function() {
this.setTimeout(msecs, emitTimeout);
});
return;
}
this.once('socket', function(sock) {
this.setTimeout(msecs, emitTimeout);
});
};
ClientRequest.prototype.setNoDelay = function() {
this._deferToConnect('setNoDelay', arguments);
};
ClientRequest.prototype.setSocketKeepAlive = function() {
this._deferToConnect('setKeepAlive', arguments);
};
ClientRequest.prototype.clearTimeout = function(cb) {
this.setTimeout(0, cb);
};
exports.request = function(options, cb) {
if (typeof options === 'string') {
options = url.parse(options);
}
if (options.protocol && options.protocol !== 'http:') {
throw new Error('Protocol:' + options.protocol + ' not supported.');
}
return new ClientRequest(options, cb);
};
exports.get = function(options, cb) {
var req = exports.request(options, cb);
req.end();
return req;
};
function ondrain() {
if (this._httpMessage) this._httpMessage.emit('drain');
}
function httpSocketSetup(socket) {
socket.removeListener('drain', ondrain);
socket.on('drain', ondrain);
}
function Server(requestListener) {
if (!(this instanceof Server)) return new Server(requestListener);
net.Server.call(this, { allowHalfOpen: true });
if (requestListener) {
this.addListener('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.addListener('connection', connectionListener);
this.addListener('clientError', function(err, conn) {
conn.destroy(err);
});
}
util.inherits(Server, net.Server);
exports.Server = Server;
exports.createServer = function(requestListener) {
return new Server(requestListener);
};
function connectionListener(socket) {
var self = this;
var outgoing = [];
var incoming = [];
function abortIncoming() {
while (incoming.length) {
var req = incoming.shift();
req.emit('aborted');
req.emit('close');
}
// abort socket._httpMessage ?
}
function serverSocketCloseListener() {
debug('server socket close');
// mark this parser as reusable
if (this.parser)
freeParser(this.parser);
abortIncoming();
}
debug('SERVER new http connection');
httpSocketSetup(socket);
socket.setTimeout(2 * 60 * 1000); // 2 minute timeout
socket.once('timeout', function() {
socket.destroy();
});
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;
}
socket.addListener('error', function(e) {
self.emit('clientError', e, this);
});
socket.ondata = function(d, start, end) {
var ret = parser.execute(d, start, end - start);
if (ret instanceof Error) {
debug('parse error');
socket.destroy(ret);
} else if (parser.incoming && parser.incoming.upgrade) {
// Upgrade or CONNECT
var bytesParsed = ret;
var req = parser.incoming;
socket.ondata = null;
socket.onend = null;
socket.removeListener('close', serverSocketCloseListener);
parser.finish();
freeParser(parser, req);
// This is start + byteParsed
var bodyHead = d.slice(start + bytesParsed, end);
var eventName = req.method === 'CONNECT' ? 'connect' : 'upgrade';
if (self.listeners(eventName).length) {
self.emit(eventName, req, req.socket, bodyHead);
} else {
// Got upgrade header or CONNECT method, but have no handler.
socket.destroy();
}
}
};
socket.onend = function() {
var ret = parser.finish();
if (ret instanceof Error) {
debug('parse error');
socket.destroy(ret);
return;
}
if (!self.httpAllowHalfOpen) {
abortIncoming();
if (socket.writable) socket.end();
} else if (outgoing.length) {
outgoing[outgoing.length - 1]._last = true;
} else if (socket._httpMessage) {
socket._httpMessage._last = true;
} else {
if (socket.writable) socket.end();
}
};
socket.addListener('close', serverSocketCloseListener);
// The following callback is issued after the headers have been read on a
// new message. In this callback we setup the response object and pass it
// to the user.
parser.onIncoming = function(req, shouldKeepAlive) {
incoming.push(req);
var res = new ServerResponse(req);
res.shouldKeepAlive = shouldKeepAlive;
DTRACE_HTTP_SERVER_REQUEST(req, socket);
COUNTER_HTTP_SERVER_REQUEST();
if (socket._httpMessage) {
// There are already pending outgoing res, append.
outgoing.push(res);
} else {
res.assignSocket(socket);
}
// When we're finished writing the response, check if this is the last
// respose, if so destroy the socket.
res.on('finish', function() {
// 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(incoming.length == 0 || incoming[0] === req);
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._dump();
res.detachSocket(socket);
if (res._last) {
socket.destroySoon();
} else {
// start sending the next message
var m = outgoing.shift();
if (m) {
m.assignSocket(socket);
}
}
});
if (req.headers.expect !== undefined &&
(req.httpVersionMajor == 1 && req.httpVersionMinor == 1) &&
continueExpression.test(req.headers['expect'])) {
res._expect_continue = true;
if (self.listeners('checkContinue').length) {
self.emit('checkContinue', req, res);
} else {
res.writeContinue();
self.emit('request', req, res);
}
} else {
self.emit('request', req, res);
}
return false; // Not a HEAD response. (Not even a response!)
};
}
exports._connectionListener = connectionListener;
// Legacy Interface
function Client(port, host) {
if (!(this instanceof Client)) return new Client(port, host);
EventEmitter.call(this);
host = host || 'localhost';
port = port || 80;
this.host = host;
this.port = port;
this.agent = new Agent({ host: host, port: port, maxSockets: 1 });
}
util.inherits(Client, EventEmitter);
Client.prototype.request = function(method, path, headers) {
var self = this;
var options = {};
options.host = self.host;
options.port = self.port;
if (method[0] === '/') {
headers = path;
path = method;
method = 'GET';
}
options.method = method;
options.path = path;
options.headers = headers;
options.agent = self.agent;
var c = new ClientRequest(options);
c.on('error', function(e) {
self.emit('error', e);
});
// The old Client interface emitted 'end' on socket end.
// This doesn't map to how we want things to operate in the future
// but it will get removed when we remove this legacy interface.
c.on('socket', function(s) {
s.on('end', function() {
if (self._decoder) {
var ret = self._decoder.end();
if (ret)
self.emit('data', ret);
}
self.emit('end');
});
});
return c;
};
exports.Client = util.deprecate(Client,
'http.Client will be removed soon. Do not use it.');
exports.createClient = util.deprecate(function(port, host) {
return new Client(port, host);
}, 'http.createClient is deprecated. Use `http.request` instead.');
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