Fix a bug where the Request would only emit a single data event/pipe only 32k byte

Author: jangxx

lib/streams.js

@@ -51,6 +51,7 @@ InputStream.prototype._data = function (chunk) {
 };
 
 InputStream.prototype._read = function (size) {
+    this._canPush = true;
     while (this._buffer.length && (this._canPush = this.push(this._buffer.shift())));
 };