httpx giving UnsupportedProtocl error while running tests

[onlinejudge95]

While implementing a unit test for a FastAPI server particularly in a GET route in which I am using httpx to send a get request(with some query params) to another service, I am receiving the following error

    @contextlib.contextmanager
    def map_httpcore_exceptions() -> typing.Iterator[None]:
        try:
            yield
        except Exception as exc:
            mapped_exc = None
    
            for from_exc, to_exc in HTTPCORE_EXC_MAP.items():
                if not isinstance(exc, from_exc):
                    continue
                # We want to map to the most specific exception we can find.
                # Eg if `exc` is an `httpcore.ReadTimeout`, we want to map to
                # `httpx.ReadTimeout`, not just `httpx.TimeoutException`.
                if mapped_exc is None or issubclass(to_exc, mapped_exc):
                    mapped_exc = to_exc
    
            if mapped_exc is None:  # pragma: nocover
                raise
    
            message = str(exc)
>           raise mapped_exc(message) from exc
E           httpx.UnsupportedProtocol: Unsupported URL protocol ''

../../../.pyenv/versions/3.9.4/envs/api-gateway/lib/python3.9/site-packages/httpx/_transports/default.py:78: UnsupportedProtocol
...
========================================================================================= short test summary info ==========================================================================================
FAILED tests/email/test_routes.py::test_fetch_email_fails_invalid_params[http://localhost:8000/api/email/-request_body0-400] - httpx.UnsupportedProtocol: Unsupported URL protocol ''

The test in question is

@mark.parametrize("test_url,request_body,response_code", TEST_DATA_INVALID["GET"])
def test_fetch_email_fails_invalid_params(
    test_client, test_url, request_body, response_code
):
    response = test_client.get(test_url, params=request_body)

    assert response.status_code == response_code
    assert "request_id" not in response.json()

For full traceback please refer to the following GitHub action run
My entire codebase can be found here
Link to the failing test file
Link to System under test

[tomchristie]

You're probably not setting EMAIL_MICROSERVICE_URL, and when this request gets made it's to a URL like "/api/email".

We should probably include more information in that exception to make it clear what the full requested URL was, and make it more obvious that it was missing the "https://" or "http://" portion.

[onlinejudge95]

Makes sense as the other POST requests are blocked by FastAPI itself.