[BUG] Inherited interface level Headers attribute does not work

[jmichas]

Describe the bug
Headers attribute placed at the interface level of an inherited interface does not work.
For instance if you have

public interface IWebApi : IAccountApi
{
   void Foo(); //hack to make api not error when using only inherited methods
}

[Headers("Authorization: Bearer")]
public interface IAccountApi
{
   Task GetUserAccountBalance(string userId);
}

causes my integration tests that use the refit client to hang with no error or crash with no details.

Moving the [Headers()] to the method level works.

public interface IAccountApi
{
   [Headers("Authorization: Bearer")]
   Task GetUserAccountBalance(string userId);
}

The workaround is completely fine, but in the case where you want to use authorization for a lot of methods and or something like a version header where you would want the entire interface to use the same version, it becomes cumbersome.

Expected behavior
You would expect that the Headers attribute wouldn't cause the dotnet process to crash and or hang.

Screenshots

Environment

• OS: MacOS 10.15.7
• Visual Studio Mac 8.8.5
• Asp.Net Core API v3.1

Additional context
My refit api interfaces are in a separate project so they can be shared between integration tests and my mobile client.

[clairernovotny]

Do you have a repro? I added tests for this scenario and they pass:

9e5260e

[ChrisPulman]

Issue notified as resolved.

[github-actions]

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