Ensure proper parsing of HTTP headers to avoid problem with a header having an empty value.

Author: sleavitt

lib/http.js

@@ -22,6 +22,7 @@ var parsers = new FreeList('parsers', 1000, function () {
     parser.incoming = new IncomingMessage(parser.socket);
     parser.field = null;
     parser.value = null;
+    parser.fieldFound = false;
   };
 
   // Only servers will get URL events.
@@ -37,10 +38,11 @@ var parsers = new FreeList('parsers', 1000, function () {
 
   parser.onHeaderField = function (b, start, len) {
     var slice = b.toString('ascii', start, start+len).toLowerCase();
-    if (parser.value) {
+    if (parser.fieldFound) {
       parser.incoming._addHeaderLine(parser.field, parser.value);
       parser.field = null;
       parser.value = null;
+      parser.fieldFound = false;
     }
     if (parser.field) {
       parser.field += slice;
@@ -51,6 +53,7 @@ var parsers = new FreeList('parsers', 1000, function () {
 
   parser.onHeaderValue = function (b, start, len) {
     var slice = b.toString('ascii', start, start+len);
+    parser.fieldFound = true;
     if (parser.value) {
       parser.value += slice;
     } else {
@@ -59,7 +62,7 @@ var parsers = new FreeList('parsers', 1000, function () {
   };
 
   parser.onHeadersComplete = function (info) {
-    if (parser.field && parser.value) {
+    if (parser.fieldFound) {
       parser.incoming._addHeaderLine(parser.field, parser.value);
     }