Web Reference: OpenAPI doesn't support a way to declare a path parameter to contain a path inside, as that could lead to scenarios that are difficult to test and define. Nevertheless, you can still do it in FastAPI, using one of the internal tools from Starlette. Jul 23, 2025 · To ensure the accuracy of provided values and enforce expected data types in FastAPI, path parameters with specific types can be employed. This practice facilitates validation, guarding against potential issues arising from the use of incorrect parameter types. In FastAPI, such a path string is given as a parameter to the operation decorator. The operation here refers to the HTTP verb used by the browser to send the data.
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