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            - middleware

from fastapi import FastAPI, HTTPException
from fastapi.exception_handlers import (
    http_exception_handler,
    request_validation_exception_handler,
)
from fastapi.exceptions import RequestValidationError
from starlette.exceptions import HTTPException as StarletteHTTPException

app = FastAPI()


@app.exception_handler(StarletteHTTPException)
async def custom_http_exception_handler(request, exc):
    print(f"OMG! An HTTP error!: {repr(exc)}")

from starlette.exceptions import HTTPException as StarletteHTTPException

app = FastAPI()


@app.exception_handler(StarletteHTTPException)
async def http_exception_handler(request, exc):
    return PlainTextResponse(str(exc.detail), status_code=exc.status_code)


@app.exception_handler(RequestValidationError)
async def validation_exception_handler(request, exc: RequestValidationError):
    message = "Validation errors:"

from fastapi.encoders import jsonable_encoder
from fastapi.exceptions import RequestValidationError
from fastapi.responses import JSONResponse
from pydantic import BaseModel

app = FastAPI()


@app.exception_handler(RequestValidationError)
async def validation_exception_handler(request: Request, exc: RequestValidationError):
    return JSONResponse(
        status_code=422,

from fastapi import FastAPI, Request
from fastapi.responses import JSONResponse


class UnicornException(Exception):
    def __init__(self, name: str):
        self.name = name


app = FastAPI()


@app.exception_handler(UnicornException)
async def unicorn_exception_handler(request: Request, exc: UnicornException):
    return JSONResponse(
        status_code=418,

Y quieres manejar esta excepción globalmente con FastAPI.

Podrías agregar un manejador de excepciones personalizado con `@app.exception_handler()`:

{* ../../docs_src/handling_errors/tutorial003_py310.py hl[5:7,13:18,24] *}

Aquí, si solicitas `/unicorns/yolo`, la *path operation* lanzará un `UnicornException`.

Diyelim ki sizin (ya da kullandığınız bir kütüphanenin) `raise` edebileceği `UnicornException` adında özel bir exception’ınız var.

Ve bu exception’ı FastAPI ile global olarak handle etmek istiyorsunuz.

`@app.exception_handler()` ile özel bir exception handler ekleyebilirsiniz:

{* ../../docs_src/handling_errors/tutorial003_py310.py hl[5:7,13:18,24] *}

可以使用[与 Starlette 相同的异常处理工具](https://www.starlette.dev/exceptions/)添加自定义异常处理器。

假设有一个自定义异常 `UnicornException`（你自己或你使用的库可能会 `raise` 它）。

并且你希望用 FastAPI 在全局处理该异常。

此时，可以用 `@app.exception_handler()` 添加自定义异常处理器：

{* ../../docs_src/handling_errors/tutorial003_py310.py hl[5:7,13:18,24] *}

这里，请求 `/unicorns/yolo` 时，路径操作会触发 `UnicornException`。

但该异常将会被 `unicorn_exception_handler` 处理。

Let's say you have a custom exception `UnicornException` that you (or a library you use) might `raise`.

And you want to handle this exception globally with FastAPI.

You could add a custom exception handler with `@app.exception_handler()`:

{* ../../docs_src/handling_errors/tutorial003_py310.py hl[5:7,13:18,24] *}

Here, if you request `/unicorns/yolo`, the *path operation* will `raise` a `UnicornException`.

你可以使用 [Starlette 的相同例外工具](https://www.starlette.dev/exceptions/) 來加入自訂例外處理器。

假設你有一個自訂例外 `UnicornException`，你（或你使用的函式庫）可能會 `raise` 它。

而你想用 FastAPI 全域處理這個例外。

你可以使用 `@app.exception_handler()` 加入自訂例外處理器：

{* ../../docs_src/handling_errors/tutorial003_py310.py hl[5:7,13:18,24] *}

在這裡，如果你請求 `/unicorns/yolo`，該「路徑操作」會 `raise` 一個 `UnicornException`。

但它會被 `unicorn_exception_handler` 所處理。