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1720 lines (1438 loc) · 46.9 KB
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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 EventEmitter = require('events').EventEmitter;
var FreeList = require('freelist').FreeList;
var HTTPParser = process.binding('http_parser').HTTPParser;
var assert = require('assert').ok;
var END_OF_FILE = {};
var debug;
if (process.env.NODE_DEBUG && /http/.test(process.env.NODE_DEBUG)) {
debug = function(x) { console.error('HTTP: %s', x); };
} else {
debug = function() { };
}
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 = function(headers, url) {
// Once we exceeded headers limit - stop collecting them
if (parser.maxHeaderPairs <= 0 ||
parser._headers.length < parser.maxHeaderPairs) {
parser._headers = parser._headers.concat(headers);
}
parser._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.
parser.onHeadersComplete = function(info) {
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.toLowerCase(), 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;
};
parser.onBody = function(b, start, len) {
// TODO body encoding?
var slice = b.slice(start, start + len);
if (parser.incoming._paused || parser.incoming._pendings.length) {
parser.incoming._pendings.push(slice);
} else {
parser.incoming._emitData(slice);
}
};
parser.onMessageComplete = function() {
parser.incoming.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.toLowerCase(), v);
}
parser._headers = [];
parser._url = '';
}
if (!parser.incoming.upgrade) {
// For upgraded connections, also emit this after parser.execute
if (parser.incoming._paused || parser.incoming._pendings.length) {
parser.incoming._pendings.push(END_OF_FILE);
} else {
parser.incoming.readable = false;
parser.incoming._emitEnd();
}
}
if (parser.socket.readable) {
// force to read the next incoming message
parser.socket.resume();
}
};
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
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
};
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.Stream.call(this);
// TODO Remove one of these eventually.
this.socket = socket;
this.connection = socket;
this.httpVersion = null;
this.complete = false;
this.headers = {};
this.trailers = {};
this.readable = true;
this._paused = false;
this._pendings = [];
this._endEmitted = false;
// request (server) only
this.url = '';
this.method = null;
// response (client) only
this.statusCode = null;
this.client = this.socket;
}
util.inherits(IncomingMessage, stream.Stream);
exports.IncomingMessage = IncomingMessage;
IncomingMessage.prototype.destroy = function(error) {
this.socket.destroy(error);
};
IncomingMessage.prototype.setEncoding = function(encoding) {
var StringDecoder = require('string_decoder').StringDecoder; // lazy load
this._decoder = new StringDecoder(encoding);
};
IncomingMessage.prototype.pause = function() {
this._paused = true;
this.socket.pause();
};
IncomingMessage.prototype.resume = function() {
this._paused = false;
if (this.socket) {
this.socket.resume();
}
this._emitPending();
};
IncomingMessage.prototype._emitPending = function(callback) {
if (this._pendings.length) {
var self = this;
process.nextTick(function() {
while (!self._paused && self._pendings.length) {
var chunk = self._pendings.shift();
if (chunk !== END_OF_FILE) {
assert(Buffer.isBuffer(chunk));
self._emitData(chunk);
} else {
assert(self._pendings.length === 0);
self.readable = false;
self._emitEnd();
}
}
if (callback) {
callback();
}
});
} else if (callback) {
callback();
}
};
IncomingMessage.prototype._emitData = function(d) {
if (this._decoder) {
var string = this._decoder.write(d);
if (string.length) {
this.emit('data', string);
}
} else {
this.emit('data', d);
}
};
IncomingMessage.prototype._emitEnd = function() {
if (!this._endEmitted) {
this.emit('end');
}
this._endEmitted = true;
};
// 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;
switch (field) {
// Array headers:
case 'set-cookie':
if (field in dest) {
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 'sec-websocket-extensions':
case 'sec-websocket-protocol':
if (field in dest) {
dest[field] += ', ' + value;
} else {
dest[field] = value;
}
break;
default:
if (field.slice(0, 2) == 'x-') {
// except for x-
if (field in dest) {
dest[field] += ', ' + value;
} else {
dest[field] = value;
}
} else {
// drop duplicates
if (!(field in dest)) dest[field] = value;
}
break;
}
};
function OutgoingMessage() {
stream.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;
}
util.inherits(OutgoingMessage, stream.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 (this.connection &&
this.connection._httpMessage === this &&
this.connection.writable) {
// 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 {
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) {
var sentConnectionHeader = false;
var sentContentLengthHeader = false;
var sentTransferEncodingHeader = false;
var sentDateHeader = false;
var sentExpect = false;
// 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 messageHeader = firstLine;
var field, value;
var self = this;
function store(field, value) {
messageHeader += field + ': ' + value + CRLF;
if (connectionExpression.test(field)) {
sentConnectionHeader = true;
if (closeExpression.test(value)) {
self._last = true;
} else {
self.shouldKeepAlive = true;
}
} else if (transferEncodingExpression.test(field)) {
sentTransferEncodingHeader = true;
if (chunkExpression.test(value)) self.chunkedEncoding = true;
} else if (contentLengthExpression.test(field)) {
sentContentLengthHeader = true;
} else if (dateExpression.test(field)) {
sentDateHeader = true;
} else if (expectExpression.test(field)) {
sentExpect = true;
}
}
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++) {
store(field, value[j]);
}
} else {
store(field, value);
}
}
}
// Date header
if (this.sendDate == true && sentDateHeader == false) {
messageHeader += 'Date: ' + utcDate() + CRLF;
}
// keep-alive logic
if (sentConnectionHeader === false) {
var shouldSendKeepAlive = this.shouldKeepAlive &&
(sentContentLengthHeader ||
this.useChunkedEncodingByDefault ||
this.agent);
if (shouldSendKeepAlive) {
messageHeader += 'Connection: keep-alive\r\n';
} else {
this._last = true;
messageHeader += 'Connection: close\r\n';
}
}
if (sentContentLengthHeader == false && sentTransferEncodingHeader == false) {
if (this._hasBody) {
if (this.useChunkedEncodingByDefault) {
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 = 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 (sentExpect) this._send('');
};
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;
};
OutgoingMessage.prototype.write = function(chunk, encoding) {
if (!this._header) {
this._implicitHeader();
}
if (!this._hasBody) {
console.error('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;
}
};
OutgoingMessage.prototype.end = function(data, encoding) {
if (this.finished) {
return false;
}
if (!this._header) {
this._implicitHeader();
}
if (data && !this._hasBody) {
console.error('This type of response MUST NOT have a body. ' +
'Ignoring data passed to end().');
data = false;
}
var ret;
var hot = this._headerSent === false &&
typeof(data) === 'string' &&
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 (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);
}
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);
} else {
assert(this instanceof ClientRequest);
DTRACE_HTTP_CLIENT_REQUEST(this, this.connection);
}
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 = false;
this.shouldKeepAlive = false;
}
}
util.inherits(ServerResponse, OutgoingMessage);
exports.ServerResponse = ServerResponse;
ServerResponse.prototype.statusCode = 200;
function onServerResponseClose() {
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 (field in headers) {
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.