GraphiQL
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    # Welcome to GraphiQL
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    #
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    # GraphiQL is an in-browser tool for writing, validating, and
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    # testing GraphQL queries.
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    #
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    # Type queries into this side of the screen, and you will see intelligent
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    # typeaheads aware of the current GraphQL type schema and live syntax and
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    # validation errors highlighted within the text.
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    #
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    # GraphQL queries typically start with a "{" character. Lines that start
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    # with a # are ignored.
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    #
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    # An example GraphQL query might look like:
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    #
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    #     {
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    #       field(arg: "value") {
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    #         subField
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    #       }
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    #     }
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    #
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    # Keyboard shortcuts:
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    #
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    #   Prettify query:  Shift-Ctrl-P (or press the prettify button)
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    #
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    #  Merge fragments:  Shift-Ctrl-M (or press the merge button)
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    #
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    #        Run Query:  Ctrl-Enter (or press the play button)
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    #
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    #    Auto Complete:  Ctrl-Space (or just start typing)
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    #
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    ​
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    ​
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    ​
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    ​
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    {
      "errors": [
        {
          "message": "Invalid or incomplete introspection result. Ensure that you are passing \"data\" property of introspection response and no \"errors\" was returned alongside: { __schema: null }.",
          "stack": "Error: Invalid or incomplete introspection result. Ensure that you are passing \"data\" property of introspection response and no \"errors\" was returned alongside: { __schema: null }.\n    at devAssert (https://cdn.jsdelivr.net/npm/graphiql@3.0.6/graphiql.min.js:24522:11)\n    at Object.buildClientSchema (https://cdn.jsdelivr.net/npm/graphiql@3.0.6/graphiql.min.js:33193:137)\n    at https://cdn.jsdelivr.net/npm/graphiql@3.0.6/graphiql.min.js:64413:23"
        }
      ]
    }