The GetAsync_SetAutomaticDecompression_ContentDecompressed_Deflate test hits the external httpbin.org/deflate endpoint, which has been returning frequent 503 Service Temporarily Unavailable responses. The test already tolerated a fixed set of gateway errors (502/504) and 503, but the endpoint can return other transient 5xx codes.

Changes

• Broadened the tolerated-error check in HttpClientHandlerTest.RemoteServer.cs to skip on any 5xx response instead of the specific BadGateway/GatewayTimeout/ServiceUnavailable set.

using HttpResponseMessage response = await client.GetAsync(uri);
if ((int)response.StatusCode >= 500)
{
    // Ignore any 5xx server error, the test depends on an external server that is out of our control.
    _output.WriteLine(response.ToString());
    return;
}