Distinguishing HTTP error codes

[Michal Blazejczyk]

Hi all,

I'm just beginning to get into Elm, and I encountered an issue.  My Elm app is making a POST request (Http.post) and when the server returns 400 or 401, I get NetworkError instead of BadStatus which means that I cannot distinguish between error codes.

Looking at Javascript generated by the Elm compiler, I see:

function toTask(request, maybeProgress)
{
  // ...
  xhr.addEventListener('error', function() {
    callback(_elm_lang$core$Native_Scheduler.fail({ ctor: 'NetworkError' }));
  });
  xhr.addEventListener('timeout', function() {
    callback(_elm_lang$core$Native_Scheduler.fail({ ctor: 'Timeout' }));
  });
  xhr.addEventListener('load', function() {
    callback(handleResponse(xhr, request.expect.responseToResult));
  });
  // ...
}

For 400 and 401 responses, the browser triggers the listener for 'error'.  Is there a way to have Elm generate a BadStatus in this case?

Best,

Michal

[Rafał Cieślak]

Did you look into Http.expectStringResponse? I've never used it, but the docs say:

Maybe you want the whole Response: status code, headers, body, etc. This lets you get all of that information. From there you can use functions like Json.Decode.decodeString to interpret it as JSON or whatever else you want.

[Peter Damoc]

Are you able to confirm in the developer console or Postman or some other tool that you are actually getting a 401 from the server? 

I'm getting 400 and 401 just fine from my servers and Elm is encoding them just fine as a BadStatus. 

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[Michal Blazejczyk]

Actually, this was a problem with CORS configuration on the server.  Once I fixed it, the problem in Elm went away.

Apologies and thank you  :)

Best,

Michal

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