Graphiql Playground is loading infinite

[TheEightArms]

Hi i got a problem with loading the integrated Playground.
If i start loading the http://localhost:3001/graphql the page is loading infinite,

here is my configuration:

graphqlHttp({
schema: graphqlSchema,
rootValue: graphqlResolver,
graphiql: true,
customFormatErrorFn(err) {
.....
}

here is my request header

can anyone help me ?
I dont have an idea what to do or how to troubleshoot.

Thx a lot

Daniel

[acao]

GraphQL Playground is not included in this project. Do you mean graphiql?

what happens if you remove the custom error formatter?

[acao]

@TheEightArms can you create an example repo to show me this error? otherwise it's very difficult to diagnose this issue you are having

[enisdenjo]

This library has been deprecated and this repo will be archived soon. It has been superseded by graphql-http.

Furthermore, if you seek a fully-featured, well-maintained and performant server - I heavily recommend GraphQL Yoga!