Handle HTTP Response with no content-length header

I ran into an issue with a Google Rest API which did not send back a content-length header or a transfer-encoding header.  If this happens the HTTPClient gives the user no access to the response body in any way.  So my solution is to set the _size variable to the remaining length of data available on _client which makes sense and works perfectly for me now.

Author: telliottosceola

libraries/HTTPClient/src/HTTPClient.cpp

@@ -1159,7 +1159,11 @@ int HTTPClient::handleHeaderResponse()
 
                 if(_size > 0) {
                     log_d("size: %d", _size);
-                }
+                }else{
+		  if(_client->available() > 0){
+		    _size = _client->available();
+		  }
+		}
 
                 if(transferEncoding.length() > 0) {
                     log_d("Transfer-Encoding: %s", transferEncoding.c_str());