** (Phoenix.NotAcceptableError) no supported media type in accept header

Phoenix Forum Questions / Help
,
1

I am getting the below error while executing an GET api from supavisor. I have searched regarding this and tried some ways to fix it but didn’t get any solution. Most of the docs are related to xml and I think my error is due to text.
I am new to elixir and phoenix, can anyone suggest something to fix the error?

# Phoenix.NotAcceptableError at GET /api/health

Exception:

    ** (Phoenix.NotAcceptableError) no supported media type in accept header.
    
    Expected one of ["json"] but got the following formats:
    
      * "text/plain" with extensions: ["txt", "text"]
    
    To accept custom formats, register them under the :mime library
    in your config/config.exs file:
    
        config :mime, :types, %{
          "application/xml" => ["xml"]
        }
2

Can you show the part from your router.ex that’s responsible for this endpoint? And its pipeline inside the same file?

3

I got two parts with pipeline from router.ex
One part I have modified and given the below to accept the json and xml

 For example:

      defmodule MyAppWeb.Router do
        use Phoenix.Router

        pipeline :browser do
          plug :fetch_session
          plug :accepts, ["html", "json", "xml"]
        end

        scope "/" do
          pipe_through :browser

          # browser related routes and resources
        end
      end

The second part showing like this

      pipeline :browser do
        plug :fetch_session
        plug :accepts, ["html"]
      end

      pipeline :auth do
        plug :ensure_authenticated
      end

      scope "/" do
        pipe_through [:browser, :auth]

        get "/posts/new", PostController, :new
        post "/posts", PostController, :create
      end

      scope "/" do
        pipe_through [:browser]

        get "/posts", PostController, :index
        get "/posts/:id", PostController, :show
      end
4

The parts you posted don’t cover the route that’s failing (/api/health) or show the configuration that’s likely causing it - I’d guess that there’s an :api pipeline block with plug :accepts, ["json"] in it, based solely on the error message’s expectation:

5

Thank you for the update.
My application is supavisor and I configured it using Setup - supavisor
I am calling an API using curl command
Could you please suggest something that can figure out the issue?

6

The /api/health route is defined here, which is routed through the :api pipeline, which has plug :accepts, ["json"].

You’ll need to include the appropriate header in your curl command, something like -H "Accept: application/json"

1 Like
7

Thank you @al2o3cr
Now I am able to hit the API using curl command using linux terminal but from browser it’s not working.

8

Is there anyway to resolve the issue with browser?

9

How are you making the request “with browser”?

10

Here are some freshly-generated router pipelines:

  pipeline :browser do
    plug :accepts, ["html"]
    plug :fetch_session
    plug :fetch_live_flash
    plug :put_root_layout, html: {HelloPhoenixWeb.Layouts, :root}
    plug :protect_from_forgery
    plug :put_secure_browser_headers
  end

  pipeline :api do
    plug :accepts, ["json"]
  end

Copy from these until you have un-broken your application.