Inconsistent API requests

Questions & Help Questions
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8

I’ve run into some trouble getting absinthe to work on my app. The error message in the logs is

[debug] ** (Phoenix.Router.NoRouteError) no route found for POST /graphql (LookupPhoenix.Router)
    (lookup_phoenix) web/router.ex:1: LookupPhoenix.Router.match_route/4
    (lookup_phoenix) web/router.ex:1: LookupPhoenix.Router.do_call/2
    (lookup_phoenix) lib/lookup_phoenix/endpoint.ex:1: LookupPhoenix.Endpoint.phoenix_pipeline/1
    (lookup_phoenix) lib/plug/debugger.ex:123: LookupPhoenix.Endpoint."call (overridable 3)"/2
    (lookup_phoenix) lib/lookup_phoenix/endpoint.ex:1: LookupPhoenix.Endpoint.call/2
    (plug) lib/plug/adapters/cowboy/handler.ex:15: Plug.Adapters.Cowboy.Handler.upgrade/4
    (cowboy) /Users/carlson/dev/elixir/ns_umbrella/deps/cowboy/src/cowboy_protocol.erl:442: :cowboy_protocol.execute/4

The request in graphiQL is POST http://localhost:4001/graphql and the error message there is

SyntaxError: Unexpected token < in JSON at position 0

In web/router.ex I have the code

  forward "/graphiql", Absinthe.Plug.GraphiQL,
      schema: NoteApi.Schema

and in phoenix.router.ex I have added the code

  defmodule NoteApi.Router do
      use NoteApi.Web, :router
      # ...
      forward "/graphql", Absinthe.Plug,
        schema: NoteApi.Schema
      # ...
    end

What would you suggest?