Ash*_*mPL 4 python exception http-status-code-404 starlette fastapi
我正在为 Discord 制作一个 rick roll 网站，我想重定向到404响应状态代码的 rick roll 页面。
我尝试了以下方法，但没有成功：
@app.exception_handler(fastapi.HTTPException)
async def http_exception_handler(request, exc):
...
一个更优雅的解决方案是使用自定义异常处理程序，传递您想要处理的异常的状态代码，如下所示：
from fastapi.responses import RedirectResponse
from fastapi.exceptions import HTTPException
@app.exception_handler(404)
async def not_found_exception_handler(request: Request, exc: HTTPException):
return RedirectResponse('https://fastapi.tiangolo.com')
或者，使用exception_handlersFastAPI 类的参数，如下所示：
async def not_found_error(request: Request, exc: HTTPException):
return RedirectResponse('https://fastapi.tiangolo.com')
exception_handlers = {404: not_found_error}
app = FastAPI(exception_handlers=exception_handlers)
注意：在上面的示例中，RedirectResponse返回了 a，因为 OP 要求重定向用户。但是，您可以返回一些自定义Response,HTMLResponse或Jinja2 TemplateResponse，如下面的示例所示。
应用程序.py
from fastapi import FastAPI, Request
from fastapi.templating import Jinja2Templates
from fastapi.exceptions import HTTPException
async def not_found_error(request: Request, exc: HTTPException):
return templates.TemplateResponse('404.html', {'request': request}, status_code=404)
async def internal_error(request: Request, exc: HTTPException):
return templates.TemplateResponse('500.html', {'request': request}, status_code=500)
templates = Jinja2Templates(directory='templates')
exception_handlers = {
404: not_found_error,
500: internal_error
}
app = FastAPI(exception_handlers=exception_handlers)
模板/404.html
<!DOCTYPE html>
<html>
<title>Not Found</title>
<body>
<h1>Not Found</h1>
<p>The requested resource was not found on this server.</p>
</body>
</html>
模板/500.html
<!DOCTYPE html>
<html>
<title>Internal Server Error</title>
<body>
<h1>Internal Server Error</h1>
<p>The server encountered an internal error or
misconfiguration and was unable to complete your request.
</p>
</body>
</html>
您需要创建middleware并检查status_code的response。如果是404，则返回 a RedirectResponse。例子：
from fastapi import Request
from fastapi.responses import RedirectResponse
@app.middleware("http")
async def redirect_on_not_found(request: Request, call_next):
response = await call_next(request)
if response.status_code == 404:
return RedirectResponse("https://fastapi.tiangolo.com")
else:
return response