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                # 異常 Sanic可以自動地在handler中拋出異常,異常信息會作為它的第一個參數,包含`response`的狀態碼。 ## 拋出異常 使用Python自帶的`raise`或者`exceptions.abort()`都可以拋出異常 ```python from sanic.exceptions import ServerError @app.route('/killme') def i_am_ready_to_die(request): raise ServerError("Something bad happened", status_code=500) @app.route('/youshallnotpass') def no_no(request): abort(401) # 直接返回,后續代碼不會再被執行 text("OK") ``` `about()`封裝了`raise`,會拋出一個基于`SanicException`的異常,除非特別指定,否則返回HTTP狀態碼對應的標準信息(在`response.STATUS_CODES`中設置)。 ## 自定義異常 使用`@app.exception`裝飾器,可以覆蓋默認的異常處理程序。這個裝飾器內置了異常列表作為參數,可以通過`SanicException`捕獲它們。被裝飾的方法必須有`Request`和`Exception`兩個對象作為參數。 ```python from sanic.response import text from sanic.exceptions import NotFound @app.exception(NotFound) def ignore_404s(request, exception): return text("Yep, I totally found the page: {}".format(request.url)) ``` ## 常用的異常 - `NotFound` 404 - `ServerError` 500 完整的異常列表可參見`sanic.exceptions`
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