How do I get the HTTP status code in the error case?

[njlr]

It looks like the response gets turned into a string for all response codes other than 2xx:

fable-fetch/src/Fetch.fs

Line 379 in b79a153

else errorString response |> failwith)

However, I need to handle HTTP codes differently in my app.

How can I get the HTTP code for error cases (e.g. 401)?

[MangelMaxime]

Hello with the current implementation you can't access it, it needs to be rewritten.

For example, in Thoth.Fetch we use a custom implementation to preserve the error information.

Right now, I guess there is 3 possibility:

• Someone steps in to improve Fable.Fetch
• Write your own implementation inside of your project
• Use a library which provides support for it like Thoth.Fetch, perhaps there are others I don't know. If you are using Thoth.Json I can only encourage you to use Thoth.Fetch :) Just for clarity, I am the maintainer of it.

[njlr]

I started using SimpleHttp, but only because that's the one I stumbled upon first.

I will leave this open since having the error code seems like an important addition to Fable.Fetch.

[forki]

@MangelMaxime we should provide a method that just runs https://github.com/fable-compiler/fable-fetch/blob/master/src/Fetch.fs#L375 without throwing if result is not ok

[MangelMaxime]

@forki Indeed, it should be enough I think for fetch method but not for tryFetch.

I guess for tryFetch we will do something like that:

let tryFetch (url: string) (init: RequestProperties list) : JS.Promise<Result<Response, Response>> =
    GlobalFetch.fetch(RequestInfo.Url url, requestProps init)
    |> Promise.map (fun response ->
        if response.Ok
        then Ok response
        else Error response)

I didn't test the code so it is possible that it doesn't compile.