Network calls stop when API interface uses HttpResponseMessage result types

[gentilim]

When creating a Refit API interface that returns a Task for all method calls appears to break. The exception shows that "A task was canceled." which I interpret as a timeout error. When I use Fiddler to monitor the network traffic, the call that resulted in the error never actually makes an external call, so it does not appear to be an issue with the remote API or handling the result, but rather Refit making the API call.

Here is a Gist that has two tests to demonstrate the issue; one uses the Refit API interface that returns model results (TestCreates - passes), and the other uses the Refit API interface that returns HttpResponseMessage results (TestPosts - fails).

Gist tests: https://gist.github.com/gentilim/8845600c874624f771eff75cb37487c3

I've noticed that the last failing call can occur on either a DELETE or POST (consistently), and haven't seen it fail on any GET (consistently).

More testing/information can be provided as needed.

[mfelicio]

I'm surprised nobody replied to this yet since it's been nearly two years since you've opened the issue. I just had the exact same problem and found the root cause, as well as a solution.

The problem is that by exposing the HttpResponseMessage, Refit won't dispose of the response's Content stream, therefore leaving the underlying tcp connection still active. Now, there's a limit to how many concurrent connections you can make per host (configurable via ServicePointManager), In my case it was a console app and the default is '2', so when making the third request it would just hang. Basically the request is queued on the client side, waiting for a tcp connection to be freed or to establish a new one.

There's a few solutions/workarounds to this problem, but the solution I ended up going with was to expose your response via the ApiResponse wrapper provided by Refit. This will internally read the stream and dispose of it, so freeing the underlying connection.

Cheers!

[clairernovotny]

Closing due to age. Please try Refit v6 and reopen if still an issue.

[github-actions]

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