


How to Define Multiple API Endpoints with Different Paths and the Same Path Parameter in FastAPI?
Defining Multiple API Endpoints with Different Paths and the Same Path Parameter in FastAPI
In FastAPI, declaring multiple API endpoints with different paths but the same path parameter can lead to unexpected route matching behavior.
Consider the following example:
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In this scenario, when API endpoints 2 and 3 are called, they execute the controller method defined in endpoint 1, namely method_one(). This is due to how FastAPI evaluates endpoints in sequence.
Solution
To ensure proper route matching, you must declare endpoints in the order of their path specificity. Because endpoints are evaluated sequentially, endpoints with more specific paths should be declared first.
In the above example, the endpoint for /project/{project_id}/{employee_id} is more specific than the endpoint for /project/details/{project_id}. Therefore, the correct declaration order is:
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By following this order, when endpoints 2 and 3 are called, the corresponding methods method_two() and method_three() will be executed as intended.
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