Cannot get schema due to Apollo-Tracing header

This issue pertains to the following package(s):

• GraphQL Playground Express Middleware

What version of graphql-playground(-electron/-middleware) are you experiencing the issue(s) on?

1.4.9

I’m unable to fetch the schema for my endpoint, because of the X-Apollo header that the playground adds. It should not be added to the options request (somehow). Executing queries works.

Failed to load https://api.deutschebahn.com/free1bahnql/v1/graphql: Request header field X-Apollo-Tracing is not allowed by Access-Control-Allow-Headers in preflight response.

[gpoitch]

Would be great for a way to disable tracing for those that don’t want to add this allowed header to their API.

[o-alexandrov]

The issue is still present as GraphQLBin.com requires us to add:

• X-Apollo-Tracing header as part of the array of:
• Access-Control-Allow-Headers

For all experiencing the issue, just add X-Apollo-Tracing to Access-Control-Allow-Headers, for example for AWS API Gateway the result would be:

const apiGatewayDefaultHeaders = `Content-Type,X-Amz-Date,Authorization,X-Api-Key,X-Amz-Security-Token,X-Amz-User-Agent`
const headersForPlaygroundToWork = `X-Apollo-Tracing`

const headers = {
  "Access-Control-Allow-Origin": "*", // Required for CORS support to work
  "Access-Control-Allow-Headers": `${apiGatewayDefaultHeaders},${headersForPlaygroundToWork}`,
  "Access-Control-Allow-Credentials": true, // Required for cookies, authorization headers with HTTPS
}