### Without `standard` Dependencies

If you don't want to include the `standard` optional dependencies, you can install with `pip install fastapi` instead of `pip install "fastapi[standard]"`.

### Additional Optional Dependencies

There are some additional dependencies you might want to install.

Additional optional Pydantic dependencies:

## Install `WebSockets`

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

<div class="termy">

```console
$ pip install websockets

---> 100%
```

</div>

## WebSockets client

### In production

確保你建立一個[虛擬環境](../virtual-environments.md){.internal-link target=_blank}，啟用它，然後**安裝 FastAPI**：

<div class="termy">

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

---> 100%
```

</div>

/// note

當你使用 `pip install "fastapi[standard]"` 安裝時，會包含一些預設的可選標準相依項。

如果你不想包含那些可選的相依項，你可以使用 `pip install fastapi` 來安裝。

///

## 進階使用者指南

還有一個**進階使用者指南**你可以稍後閱讀。

**進階使用者指南**建立在這個教學之上，使用相同的概念，並教你一些額外的功能。

public class ErrorBadrequrestAction extends FessSearchAction {

    // ===================================================================================
    //                                                                            Constant
    //

    // ===================================================================================
    //                                                                           Attribute
    //

// assembler.

package arch

import (
	"cmd/internal/obj"
	"cmd/internal/obj/riscv"
)

// IsRISCV64AMO reports whether the op (as defined by a riscv.A*
// constant) is one of the AMO instructions that requires special
// handling.
func IsRISCV64AMO(op obj.As) bool {
	switch op {
	case riscv.ASCW, riscv.ASCD, riscv.AAMOSWAPW, riscv.AAMOSWAPD, riscv.AAMOADDW, riscv.AAMOADDD,

apiVersion: install.istio.io/v1alpha1
kind: IstioOperator
metadata:
  name: test
  namespace: istio-system
spec:
  meshConfig:
    # Set enableTracing to false to disable request tracing.
    enableTracing: true
    # This is the ingress service name, update if you used a different name
    ingressService: istio-ingress
    connectTimeout: 1s
    defaultConfig:
      ### ADVANCED SETTINGS #############

 * @author Ben Yu
 * @since 1.0
 */
@GwtCompatible(emulated = true)
@ElementTypesAreNonnullByDefault
public final class Throwables {
  private Throwables() {}

  /**
   * Throws {@code throwable} if it is an instance of {@code declaredType}. Example usage:
   *
   * <pre>
   * for (Foo foo : foos) {
   *   try {
   *     foo.bar();
   *   } catch (BarException | RuntimeException | Error t) {
   *     failure = t;
   *   }

// Code generated by "stringer -type=TargetType -trimprefix=Target types.go"; DO NOT EDIT.

package types

import "strconv"

func _() {
	// An "invalid array index" compiler error signifies that the constant values have changed.
	// Re-run the stringer command to generate them again.
	var x [1]struct{}
	_ = x[TargetConsole-1]
	_ = x[TargetHTTP-2]
	_ = x[TargetKafka-3]
}

const _TargetType_name = "ConsoleHTTPKafka"

  companion object {
    /**
     * A DNS that uses [InetAddress.getAllByName] to ask the underlying operating system to
     * lookup IP addresses. Most custom [Dns] implementations should delegate to this instance.
     */
    @JvmField
    val SYSTEM: Dns = DnsSystem()

    private class DnsSystem : Dns {
      override fun lookup(hostname: String): List<InetAddress> {
        try {

public class CacheAction extends FessSearchAction {

    // ===================================================================================
    //                                                                            Constant
    //
    private static final Logger logger = LogManager.getLogger(CacheAction.class);

    // ===================================================================================