allow HTTP header value without LWS.

Author: shrhdk

libraries/ESP8266HTTPClient/src/ESP8266HTTPClient.cpp

@@ -906,7 +906,8 @@ int HTTPClient::handleHeaderResponse()
                 _returnCode = headerLine.substring(9, headerLine.indexOf(' ', 9)).toInt();
             } else if(headerLine.indexOf(':')) {
                 String headerName = headerLine.substring(0, headerLine.indexOf(':'));
-                String headerValue = headerLine.substring(headerLine.indexOf(':') + 2);
+                String headerValue = headerLine.substring(headerLine.indexOf(':') + 1);
+                headerValue.trim();
 
                 if(headerName.equalsIgnoreCase("Content-Length")) {
                     _size = headerValue.toInt();