Web Reference: In these cases you can use root_path to configure your application. The root_path is a mechanism provided by the ASGI specification (that FastAPI is built on, through Starlette). The root_path is used to handle these specific cases. And it's also used internally when mounting sub-applications. When you mount a sub-application as described above, FastAPI will take care of communicating the mount path for the sub-application using a mechanism from the ASGI specification called a root_path. Continuing from the root endpoint, we’ll explore path parameters, query parameters, and finally learn how to use the interactive Swagger documentation.
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