What is the :path converter in FastAPI?
Tests FastAPI routing semantics and URL segmentation. A strong answer states :path captures slashes across segments while plain str stops at the next slash, and cites file-serving as the use case.
Tests deep knowledge of FastAPI/Starlette path parsing and the difference between type hints and path converters. A great answer covers four points: first, a standard str parameter only matches characters between slashes because routers segment URLs on /; second, the :path converter greedily matches the remainder of the URL including slashes; third, it is required for nested file paths like docs/tutorial.md; fourth, it is a Starlette converter, not a Pydantic type. Red flag: claiming str accepts slashes or confusing :path with validation.
Read the original → fastapi.tiangolo.com
- #fastapi
- #routing
- #path-parameters
- #starlette
- #web-frameworks
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