現在，從（假的）資料庫裡用表單欄位的 `username` 取得使用者資料。

如果沒有該使用者，就回傳「Incorrect username or password」的錯誤。

我們用 `HTTPException` 這個例外來回傳錯誤：

{* ../../docs_src/security/tutorial003_an_py310.py hl[3,79:81] *}

### 檢查密碼 { #check-the-password }

這時我們已經有來自資料庫的使用者資料，但還沒檢查密碼。

先把那些資料放進 Pydantic 的 `UserInDB` 模型。

你絕對不要以純文字儲存密碼，所以我們會使用（假的）密碼雜湊系統。

如果密碼不匹配，我們回傳同樣的錯誤。

#### 密碼雜湊（hashing） { #password-hashing }

common_parameters(["common_parameters"])
read_items["/items/"]
read_users["/users/"]

common_parameters --> read_items
common_parameters --> read_users
```

这样，你只需编写一次共享代码，**FastAPI** 会在你的*路径操作*中为你调用它。

/// check | 检查

注意，无需创建专门的类并传给 **FastAPI** 去“注册”之类的操作。

只要把它传给 `Depends`，**FastAPI** 就知道该怎么做了。

///

## 共享 `Annotated` 依赖项 { #share-annotated-dependencies }

在上面的示例中，你会发现这里有一点点**代码重复**。

func GcdInt(d, x, y, a, b *Int) {
	d.doinit()
	x.doinit()
	y.doinit()
	a.doinit()
	b.doinit()
	C.mpz_gcdext(&d.i[0], &x.i[0], &y.i[0], &a.i[0], &b.i[0])
}

// ProbablyPrime performs n Miller-Rabin tests to check whether z is prime.
// If it returns true, z is prime with probability 1 - 1/4^n.
// If it returns false, z is not prime.
func (z *Int) ProbablyPrime(n int) bool {
	z.doinit()

		return false
	}
	// We have checked if prefix matches, so we can do direct compare.
	return b.First > prefix
}

// endedPrefix returns true if the given prefix ends within the block.
func (b metacacheBlock) endedPrefix(prefix string) bool {
	if prefix == "" || strings.HasPrefix(b.Last, prefix) {
		return false
	}

	// We have checked if prefix matches, so we can do direct compare.

        void testReadSizeProperty() {
            testMessage.setReadSize(1024);
            // No getter for readSize, but it's used internally in decode
        }

        @Test
        @DisplayName("Should check if async")
        void testAsyncProperty() {
            assertFalse(testMessage.isAsync());
        }
    }

    @Nested
    @DisplayName("Flag Operations Tests")
    class FlagOperationsTests {

* Increase request timeout based on termination grace period ([#31275](https://github.com/kubernetes/kubernetes/pull/31275), [@dims](https://github.com/dims))
* Skip safe to detach check if node API object no longer exists ([#30737](https://github.com/kubernetes/kubernetes/pull/30737), [@saad-ali](https://github.com/saad-ali))

                        new String(Arrays.copyOfRange(targetInfo, 4, 4 + TEST_DOMAIN.getBytes(Type2Message.UNI_ENCODING).length),
                                Type2Message.UNI_ENCODING));

                // Verify server part - check if it exists
                int serverOffset = 4 + TEST_DOMAIN.getBytes(Type2Message.UNI_ENCODING).length;
                if (serverOffset + 4 <= targetInfo.length) {

   * possible with an unsafe cast which requires {@code keys} to actually be of type {@code K}.
   *
   * @since 11.0
   */
  /*
   * <? extends Object> is mostly the same as <?> to plain Java. But to nullness checkers, they
   * differ: <? extends Object> means "non-null types," while <?> means "all types."
   */
  @Override
  public ImmutableMap<K, V> getAllPresent(Iterable<? extends Object> keys) {

     * in O(n) time stepping through the two collections.
     */
    Iterator<E> thisIterator = iterator();

    Iterator<?> thatIterator = targets.iterator();
    // known nonempty since we checked targets.size() > 1

    if (!thisIterator.hasNext()) {
      return false;
    }

    Object target = thatIterator.next();
    E current = thisIterator.next();
    try {
      while (true) {

      apply {
        val identityBody =
          body
            ?: throw IllegalStateException("cannot gzip a request that has no body")

        val contentEncoding = headers["Content-Encoding"]
        check(contentEncoding == null) {
          "Content-Encoding already set: $contentEncoding"
        }

        headers.add("Content-Encoding", "gzip")
        body = GzipRequestBody(identityBody)
      }