Problem: bound context provider was not used

Solution: use it

Author: yrashk

src/main/java/graphql/servlet/GraphQLServlet.java

@@ -123,7 +123,7 @@ public void unsetContextProvider(GraphQLContextBuilder contextBuilder) {
     }
 
     protected GraphQLContext createContext(Optional<HttpServletRequest> req, Optional<HttpServletResponse> resp) {
-        return new GraphQLContext(req, resp);
+        return contextBuilder.build(req, resp);
     }
 
     @Override @SneakyThrows