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When a client sends an HTTP request to the proxy server and no matching protocol handler plugin is available…

When a client sends an HTTP request to the proxy server and no matching protocol handler plugin is available…: a task in LegoFlow-SWE (Harbor dataset). Expected behavior: The HttpProtocolHandler should detect that no suitable handler is found, immediately return an HTTP 400 Bad Request response…

The task

**Expected behavior:** The `HttpProtocolHandler` should detect that no suitable handler is found, immediately return an HTTP 400 Bad Request response, and close the connection instead of hanging.

Part of Lego-X/LegoFlow-SWE.