fastapi router not catching unknown method

In my case adding nginx headers and fastapi config for the proxy headers did not work. I had to hardcode the replacement of http to https in the 307 redirect responses (through a middleware) as follows: The FastAPI Advanced Dependencies guide has a couple examples, specifically oriented around classes. But in your example, so long as verify_token("red") returns a callable with the right syntax and type annotations, FastAPI can use it as a dependency. The easy way is to have the function return another function: When I use FastAPI , how can I sepcify a base path for the web-service? To put it another way - are there arguments to the FastAPI object that can set the end-point and any others I define, to a different root path? As explained here, if the function for streaming the response body is a normal def generator and not an async def one, FastAPI will use iterate_in_threadpool() to run the iterator/generator in a separate thread that is then await ed—see StreamingResponse 's relevant source code. FastAPI throws an error (Error loading ASGI app. Could not import ...