Keep in mind that dataclasses can't do everything Pydantic models can do.

So, you might still need to use Pydantic models.

But if you have a bunch of dataclasses laying around, this is a nice trick to use them to power a web API using FastAPI. 🤓

///

## Dataclasses in `response_model` { #dataclasses-in-response-model }

You can also use `dataclasses` in the `response_model` parameter:

- Adds feature gate `KubeletInUserNamespace` which enables support for running kubelet in a user namespace.
  
  The user namespace has to be created before running kubelet.
  All the node components such as CRI need to be running in the same user namespace.
  

import jcifs.internal.util.SMBUtil;
import jcifs.smb.NtlmPasswordAuthenticator;
import jcifs.smb.SmbException;

/**
 * SMB1 Session Setup AndX request message.
 *
 * This command is used to authenticate a user session and
 * establish security context for subsequent operations.
 */
public class SmbComSessionSetupAndX extends AndXServerMessageBlock {

    private byte[] lmHash, ntHash, blob = null;

**FastAPI** uses it so that, if you use a Pydantic model in `response_model`, and your data has an error, you will see the error in your log.

But the client/user will not see it. Instead, the client will receive an "Internal Server Error" with an HTTP status code `500`.

			// For any config error, we don't need to drop into safe-mode
			// instead its a user error and should be fixed by user.
			if errors.As(err, &cerr) {
				logger.FatalIf(err, "Unable to initialize the server")
			}

			// If context was canceled
			if errors.Is(err, context.Canceled) {
				logger.FatalIf(err, "Server startup canceled upon user request")
			}

			bootLogIf(GlobalContext, err)
		}

        final AsyncManager asyncManager = getAsyncManager();
        final MessageManager messageManager = getMessageManager();
        return new SMailDogmaticPostalPersonnel() {

            // *if you need user locale switching or templates from database,
            // override createConventionReceptionist() (see the method for the details)
            @Override

import (
	"bufio"
	"bytes"
	"flag"
	"fmt"
	"log"
	"math"
	"os"
	"path"
	"regexp"
	"strconv"
	"strings"
	"time"
)

var (
	goroutinesRE, searchRE *regexp.Regexp

	// User input flags
	searchText           string
	goTime, less, margin time.Duration
)

func init() {
	flag.DurationVar(&less, "less", 0, "goroutine waiting less than the specified time")

For example, the `PATH` environment variable could look like this:

//// tab | Linux, macOS

```plaintext
/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin
```

This means that the system should look for programs in the directories:

* `/usr/local/bin`
* `/usr/bin`
* `/bin`
* `/usr/sbin`
* `/sbin`

////

//// tab | Windows

```plaintext

 * your own escapers, use {@link CharEscaperBuilder}, or extend {@code CharEscaper} or {@code
 * UnicodeEscaper}.
 *
 * @author David Beaumont
 * @since 15.0
 */
@DoNotMock("Use Escapers.nullEscaper() or another methods from the *Escapers classes")
@GwtCompatible
@SuppressWarnings("EscapedEntity") // We do mean for the user to see "<" etc.
public abstract class Escaper {

![trình soạn thảo hỗ trợ](https://fastapi.tiangolo.com/img/vscode-completion.png)

Ví dụ hoàn chỉnh bao gồm nhiều tính năng hơn, xem <a href="https://fastapi.tiangolo.com/tutorial/">Tutorial - User Guide</a>.


**Cảnh báo tiết lỗ**: Tutorial - User Guide:

* Định nghĩa **tham số** từ các nguồn khác nhau như: **headers**, **cookies**, **form fields** và **files**.