[Flaky Test] Change request to POST to avoid retry on server Shutdown #105035
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Fixes: #96407
Context
I am not sure how was this test runs in past, as the code https://github.com/rokonec/runtime/blob/01fb6bdee56cbbceb0fa9f2f890b0bcb4bdacb6e/src/libraries/System.Net.Http/src/System/Net/Http/SocketsHttpHandler/HttpConnection.cs#L654-L657
intent to retry when server side shut downs its side for idle timeout or other reason.
This test has timeouted on any OS during my testing.
Originally it was belived this test was flaky on OSX only, but it was present on other OSes, just less frequently.
Changes made
Test code only changes
Test request changed from GET to POST-with-content-body to avoid implicit retry logic.