## 含 `yield` 與 `except` 的相依 { #dependencies-with-yield-and-except }

如果你在含 `yield` 的相依中用 `except` 攔截了例外，且沒有再次拋出它（或拋出新的例外），FastAPI 將無法察覺有例外發生，就像在一般的 Python 中一樣：

{* ../../docs_src/dependencies/tutorial008c_an_py310.py hl[15:16] *}

在這種情況下，客戶端會如預期地看到一個 *HTTP 500 Internal Server Error* 回應（因為我們沒有拋出 `HTTPException` 或類似的東西），但伺服器將不會有任何日誌或其他錯誤線索。😱

## Залежності з `yield` та `except` { #dependencies-with-yield-and-except }

Якщо ви перехоплюєте виняток за допомогою `except` у залежності з `yield` і не піднімаєте його знову (або не піднімаєте новий виняток), FastAPI не зможе помітити, що стався виняток, так само як це було б у звичайному Python:

/*
 * Copyright (C) 2008 The Guava Authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,

### Dependencies with `yield` and `except`, Technical Details { #dependencies-with-yield-and-except-technical-details }

/*
 * Copyright (C) 2007 The Guava Authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
 * in compliance with the License. You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software distributed under the License

e-link):not(.badge):not(.btn),\n.accent-success .nav-tabs .nav-link {\n  color: #28a745;\n}\n\n.accent-success .btn-link:hover,\n.accent-success a:not(.dropdown-item):not(.btn-app):not(.nav-link):not(.brand-link):not(.page-link):not(.badge):not(.btn):hover,\n.accent-success .nav-tabs .nav-link:hover {\n  color: #19692c;\n}\n\n.accent-success .dropdown-item:active, .accent-success .dropdown-item.active {\n  background-color: #28a745;\n  color: #fff;\n}\n\n.accent-success .custom-control-input:checked...

## Зависимости с `yield` и `except` { #dependencies-with-yield-and-except }

Если вы ловите исключение с помощью `except` в зависимости с `yield` и не вызываете его снова (или не вызываете новое исключение), FastAPI не сможет заметить, что было исключение — так же, как это происходит в обычном Python:

/*
 * Copyright (C) 2007 The Guava Authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,

/*
 * Copyright (C) 2007 The Guava Authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,

        assertEquals(name, request.getRemoteUser());
        verify(mockPrincipal, times(1)).getName();
    }

    @Test
    @DisplayName("constructor accepts null principal")
    void testConstructorWithNullPrincipal(@Mock HttpServletRequest mockRequest) {
        // Constructor accepts null principal without throwing exception
        NtlmHttpServletRequest request = new NtlmHttpServletRequest(mockRequest, null);