FastAPI, in Query arguments, interprets characters like `+`, `;` and `'` in special ways (see https://github.com/fastapi/fastapi/issues/720), which causes issues with the requests that some clients such as Panels send: Receiving these bare characters results in request errors.
So in order to prevent that special handling, move the `path` argument into the URL path: That eliminates the special-handling of those characters, resulting in far more requests from affected clients succeeding.
antifuchs