Fix streaming body with keep-alive

The body would get discarded and state would be stuck
on `REQUEST_LINE` prior to this change.

Author: kylecarbs

http-parser.js

@@ -353,6 +353,13 @@ HTTPParser.prototype.HEADER = function () {
     }
 
     info.shouldKeepAlive = this.shouldKeepAlive();
+
+    // if we have a keep alive connection and no content length header,
+    // the body is streaming and should be read raw.
+    if (info.shouldKeepAlive && !hasContentLength) {
+      this.body_bytes = null;
+    }
+
     //problem which also exists in original node: we should know skipBody before calling onHeadersComplete
     var skipBody;
     if (compatMode0_12) {