Merge pull request #349 from phpclassic/Content-Length-header

Content-Length Header for GraphQL

Author: tareqtms

lib/HttpRequestGraphQL.php

@@ -52,6 +52,8 @@ protected static function prepareRequest($httpHeaders = array(), $data = array()
  } else {
  self::$postDataGraphQL = json_encode(['query' => $data]);
  }
+
+ self::$httpHeaders['Content-Length'] = strlen(self::$postDataGraphQL);
  }
 
  /**