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Multiple API Endpoints with Identical Path Parameter
When designing RESTful APIs using FastAPI, it's possible to define multiple endpoints with different paths but a shared path parameter. However, in cases where endpoint execution becomes inconsistent, it's crucial to address potential configuration issues.
Consider the following router file in FastAPI:
<code class="python"># GET API Endpoint 1 @router.get("/project/{project_id}/{employee_id}") async def method_one( project_id: str, organization_id: str, session: AsyncSession = Depends(get_db) ): # Controller method execution # GET API Endpoint 2 @router.get("/project/details/{project_id}") async def method_two( project_id: str, session: AsyncSession = Depends(get_db) ): # Controller method execution # GET API Endpoint 3 @router.get("/project/metadata/{project_id}") async def method_three( project_id: str, session: AsyncSession = Depends(get_db) ): # Controller method execution</code>
When invoking API endpoints 2 and 3, unexpectedly, method_one's controller is executed instead of the expected method_two and method_three. This anomaly requires a careful examination of the configuration.
FastAPI evaluates endpoints in the sequence they are defined. Hence, project/{project_id}/{employee_id} will be evaluated first. Subsequently, any request to endpoints 2 and 3 will trigger endpoint 1.
Solution:
To resolve this issue, reorder the endpoint definitions in the router file, ensuring that endpoints 2 and 3 are defined before endpoint 1:
<code class="python"># GET API Endpoint 2 @router.get("/project/details/{project_id}") # ... # GET API Endpoint 3 @router.get("/project/metadata/{project_id}") # ... # GET API Endpoint 1 @router.get("/project/{project_id}/{employee_id}") # ...</code>
By reordering the endpoints, the appropriate controller methods will be executed upon API endpoint invocation.
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