Error: Invalid or incomplete introspection result. Ensure that you are passing "data" property of introspection response and no "errors" was returned alongside: undefined.

[Amnesthesia]

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Describe the bug

We output a URL from a previous step that we use as the input so that we can check a schema.gql file against one of our environments (dev, staging and prod). This usually fails, for whatever reason, often with a message like:

Error: Invalid or incomplete introspection result. Ensure that you are passing "data" property of introspection response and no "errors" was returned alongside: undefined., but I can access the site and fetch the introspection schema just fine (tested inside the github runner as well). Somehow, this comes out undefined.

This is what the step looks like:

Run kamilkisiela/graphql-inspector@master
  with:
    approve-label: breaking-schema-change
    fail-on-breaking: true
    name: ext.ourdomain.com
    schema: app/javascript/graphql/src/schema/schema_external.gql
    endpoint: https://ext.ourdomain.com/graphql
    rules: ignoreDescriptionChanges
  suppressRemovalOfDeprecatedField
  safeUnreachable
  
    github-token: ***
  env:
    GH_TOKEN: ***
    CURRENT_BRANCH_NAME: maintenance/external-schema
    TARGET_BRANCH_NAME: develop
    source_endpoint: app/javascript/graphql/src/schema/schema.gql
    source_endpoint_ext: app/javascript/graphql/src/schema/schema_external.gql
    target_environment: development
GraphQL Inspector started

Creating a check named "ext.ourdomain.com"
EXPERIMENTAL - Using Pull Request refs/pull/10248/merge
EXPERIMENTAL - Using develop as base schema ref

To Reproduce Steps to reproduce the behavior:

Set up multiple steps validating different schema files against different URLs output from a previous step.

Expected behavior

Schema to be fetched correctly every time.

Environment:

• Github Actions with ubuntu-latest (or our custom Github Actions Runners, it doesnt matter, its the same issue)
• kamilkisiela/graphql-inspector@master

[vwnd]

I am having the same issue, here.

[ianc-flwls]

@vwnd @Amnesthesia I also had this issue. I found the action expects your graphql server to assume you will always respond with JSON response.

I've fixed, see the above PR.