How to Create a Custom 404 Not Found Page in FastAPI?

Custom 404 Not Found Page with FastAPI

To create a custom 404 Not Found page, FastAPI offers several approaches. The appropriate method depends on your specific requirements.

Redirect on 404 Status Code

<br>@app.middleware("http")<br>async def redirect_on_not_found(request: Request, call_next):</p>
<div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false">response = await call_next(request)
if response.status_code == 404:
    return RedirectResponse("https://fastapi.tiangolo.com")
else:
    return response

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This middleware checks the response status code and redirects to a custom page if the code is 404.

Custom Exception Handler for 404

<br>@app.exception_handler(404)<br>async def not_found_exception_handler(request: Request, exc: HTTPException):</p>
<div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false">return RedirectResponse('https://fastapi.tiangolo.com')

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