http: provide access to raw headers/trailers

The format is [key,value,key,value,...] because that seems to have the
lowest overhead.

Close #4844

lib/_http_common.js

@@ -87,12 +87,7 @@ function parserOnHeadersComplete(info) {
     n = Math.min(n, parser.maxHeaderPairs);
   }
 
-  for (var i = 0; i < n; i += 2) {
+  parser.incoming._addHeaderLines(headers, n);
-    var k = headers[i];
-    var v = headers[i + 1];
-    parser.incoming._addHeaderLine(k, v);
-  }
-
 
   if (info.method) {
     // server only
@@ -147,11 +142,7 @@ function parserOnMessageComplete() {
     // Emit any trailing headers.
     var headers = parser._headers;
     if (headers) {
-      for (var i = 0, n = headers.length; i < n; i += 2) {
+      parser.incoming._addHeaderLines(headers, headers.length);
-        var k = headers[i];
-        var v = headers[i + 1];
-        parser.incoming._addHeaderLine(k, v);
-      }
       parser._headers = [];
       parser._url = '';
     }

lib/_http_incoming.js

@@ -49,7 +49,9 @@ function IncomingMessage(socket) {
   this.httpVersion = null;
   this.complete = false;
   this.headers = {};
+  this.rawHeaders = [];
   this.trailers = {};
+  this.rawTrailers = [];
 
   this.readable = true;
 
@@ -111,6 +113,27 @@ IncomingMessage.prototype.destroy = function(error) {
 };
 
 
+IncomingMessage.prototype._addHeaderLines = function(headers, n) {
+  if (headers && headers.length) {
+    var raw, dest;
+    if (this.complete) {
+      raw = this.rawTrailers;
+      dest = this.trailers;
+    } else {
+      raw = this.rawHeaders;
+      dest = this.headers;
+    }
+    raw.push.apply(raw, headers);
+
+    for (var i = 0; i < n; i += 2) {
+      var k = headers[i];
+      var v = headers[i + 1];
+      this._addHeaderLine(k, v, dest);
+    }
+  }
+};
+
+
 // Add the given (field, value) pair to the message
 //
 // Per RFC2616, section 4.2 it is acceptable to join multiple instances of the
@@ -118,9 +141,7 @@ IncomingMessage.prototype.destroy = function(error) {
 // 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) {
+IncomingMessage.prototype._addHeaderLine = function(field, value, dest) {
-  var dest = this.complete ? this.trailers : this.headers;
-
   field = field.toLowerCase();
   switch (field) {
     // Array headers:

test/simple/test-http-raw-headers.js

@@ -0,0 +1,131 @@
+// 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 common = require('../common');
+var assert = require('assert');
+
+var http = require('http');
+
+http.createServer(function(req, res) {
+  this.close();
+  var expectRawHeaders = [
+    'Host',
+    'localhost:12346',
+    'transfer-ENCODING',
+    'CHUNKED',
+    'x-BaR',
+    'yoyoyo',
+    'Connection',
+    'keep-alive'
+  ];
+  var expectHeaders = {
+    host: 'localhost:12346',
+    'transfer-encoding': 'CHUNKED',
+    'x-bar': 'yoyoyo',
+    connection: 'keep-alive'
+  };
+
+  var expectRawTrailers = [
+    'x-bAr',
+    'yOyOyOy',
+    'x-baR',
+    'OyOyOyO',
+    'X-bAr',
+    'yOyOyOy',
+    'X-baR',
+    'OyOyOyO'
+  ];
+
+  var expectTrailers = { 'x-bar': 'yOyOyOy, OyOyOyO, yOyOyOy, OyOyOyO' };
+
+  assert.deepEqual(req.rawHeaders, expectRawHeaders);
+  assert.deepEqual(req.headers, expectHeaders);
+
+  req.on('end', function() {
+    assert.deepEqual(req.rawTrailers, expectRawTrailers);
+    assert.deepEqual(req.trailers, expectTrailers);
+  });
+
+  req.resume();
+  res.addTrailers([
+    ['x-fOo', 'xOxOxOx'],
+    ['x-foO', 'OxOxOxO'],
+    ['X-fOo', 'xOxOxOx'],
+    ['X-foO', 'OxOxOxO']
+  ]);
+  res.end('x f o o');
+}).listen(common.PORT, function() {
+  var expectRawHeaders = [
+    'Date',
+    'Tue, 06 Aug 2013 01:31:54 GMT',
+    'Connection',
+    'keep-alive',
+    'Transfer-Encoding',
+    'chunked'
+  ];
+  var req = http.request({ port: common.PORT, path: '/' });
+  req.addTrailers([
+    ['x-bAr', 'yOyOyOy'],
+    ['x-baR', 'OyOyOyO'],
+    ['X-bAr', 'yOyOyOy'],
+    ['X-baR', 'OyOyOyO']
+  ]);
+  req.setHeader('transfer-ENCODING', 'CHUNKED');
+  req.setHeader('x-BaR', 'yoyoyo');
+  req.end('y b a r');
+  req.on('response', function(res) {
+    var expectRawHeaders = [
+      'Date',
+      null,
+      'Connection',
+      'keep-alive',
+      'Transfer-Encoding',
+      'chunked'
+    ];
+    var expectHeaders = {
+      date: null,
+      connection: 'keep-alive',
+      'transfer-encoding': 'chunked'
+    };
+    res.rawHeaders[1] = null;
+    res.headers.date = null;
+    assert.deepEqual(res.rawHeaders, expectRawHeaders);
+    assert.deepEqual(res.headers, expectHeaders);
+    res.on('end', function() {
+      var expectRawTrailers = [
+        'x-fOo',
+        'xOxOxOx',
+        'x-foO',
+        'OxOxOxO',
+        'X-fOo',
+        'xOxOxOx',
+        'X-foO',
+        'OxOxOxO'
+      ];
+      var expectTrailers = { 'x-foo': 'xOxOxOx, OxOxOxO, xOxOxOx, OxOxOxO' };
+
+      assert.deepEqual(res.rawTrailers, expectRawTrailers);
+      assert.deepEqual(res.trailers, expectTrailers);
+      console.log('ok');
+    });
+    res.resume();
+  });
+});