Make sure you create a [virtual environment](../virtual-environments.md){.internal-link target=_blank}, activate it, and then **install FastAPI**:

<div class="termy">

```console
$ pip install "fastapi[standard]"

---> 100%
```

</div>

/// note

When you install with `pip install "fastapi[standard]"` it comes with some default optional standard dependencies.

FastAPI 可以进行识别，并生成表明无响应体的 OpenAPI 文档。

///

## 关于 HTTP 状态码

/// note | "笔记"

如果已经了解 HTTP 状态码，请跳到下一章。

///

在 HTTP 协议中，发送 3 位数的数字状态码是响应的一部分。

这些状态码都具有便于识别的关联名称，但是重要的还是数字。

简言之：

* `100` 及以上的状态码用于返回**信息**。这类状态码很少直接使用。具有这些状态码的响应不能包含响应体
* **`200`** 及以上的状态码用于表示**成功**。这些状态码是最常用的
    * `200` 是默认状态代码，表示一切**正常**
    * `201` 表示**已创建**，通常在数据库中创建新记录后使用
    * `204` 是一种特殊的例子，表示**无内容**。该响应在没有为客户端返回内容时使用，因此，该响应不能包含响应体

package handlers

import (
	"context"
	"net"
	"net/http"
	"net/http/httputil"
	"net/url"
	"strings"
	"sync"
	"time"
)

const defaultFlushInterval = time.Duration(100) * time.Millisecond

// Forwarder forwards all incoming HTTP requests to configured transport.
type Forwarder struct {
	RoundTripper http.RoundTripper
	PassHost     bool
	Logger       func(error)

      context.get(), in_components, device_name, status.get());
  ASSERT_TRUE(TF_GetCode(status.get()) == TF_OK) << TF_Message(status.get());

  // Loop to make synchronization failures more deterministic
  for (int i = 0; i < 100; ++i) {
    TensorHandlePtr multiply_result(
        Multiply(context.get(), combined_value.get(), combined_value.get(),
                 status.get()));

     */
    protected String semicolonStr = "_SCLN_";

    /**
     * A string to replace &.
     */
    protected String ampersandStr = "_AMP_";

    protected int maxDuplicatedPath = 100;

    protected String charsetName = Constants.UTF_8;

    /**
     * A directory to store downloaded files.
     */
    protected File baseDir;

    protected File createFile(final String path) {

                                               value="${f:h(crawlingThreadCount)}" class="form-control"
                                               min="1" max="1000">
                                    </div>
                                </div>
                                <div class="form-group row">

    ListenableFuture<?> future = executor.submit(incrementTask);
    assertTrue(future.isDone());
    assertListenerRunImmediately(future);
    assertEquals(1, threadLocalCount.get().intValue());
    otherThread.join(1000);
    assertEquals(Thread.State.TERMINATED, otherThread.getState());
    Throwable throwable = throwableFromOtherThread.get();
    assertNull(
        "Throwable from other thread: "

<div class="termy">

```console
$ pip install pydantic-settings
---> 100%
```

</div>

Es ist bereits enthalten, wenn Sie die `all`-Extras installiert haben, mit:

<div class="termy">

```console
$ pip install "fastapi[all]"
---> 100%
```

</div>

/// info

    public static final String DEFAULT_DAILY_CRON_EXPRESSION = "0 0 * * *";

    public static final String DEFAULT_HOURLY_CRON_EXPRESSION = "0 * * * *";

    public static final int DEFAULT_INTERVAL_TIME_FOR_FS = 1000;

    public static final int DEFAULT_INTERVAL_TIME_FOR_WEB = 10000;

    public static final int DEFAULT_NUM_OF_THREAD_FOR_FS = 5;

    public static final int DEFAULT_NUM_OF_THREAD_FOR_WEB = 1;

            final DocumentBuilder builder = factory.newDocumentBuilder();

            final Document doc = builder.parse(is);

            final StringBuilder buf = new StringBuilder(1000);
            buf.append(getResultDataHeader());
            for (final Map.Entry<String, String> entry : fieldRuleMap.entrySet()) {
                final List<String> nodeStrList = new ArrayList<>();
                try {