fix flask integration

[cle-b]

Fix the error AssertionError: View function mapping is overwriting an existing endpoint function: xxxx which happened in that case:

@app.route("/anything", methods=["GET", "POST", "PUT", "DELETE", "PATCH", "TRACE"])
@app.route(
    "/anything/<path:anything>",
    methods=["GET", "POST", "PUT", "DELETE", "PATCH", "TRACE"],
)
def view_anything(anything=None):
   ...

Fix the group by test feature which was broken by httpdbg_endpoint.