* **`300`** 以上は「リダイレクト」のためのものです。これらのステータスコードを持つレスポンスは`304`（Not Modified）を除き、ボディを持つことも持たないこともできます。
* **`400`** 以上は「クライアントエラー」のレスポンスのためのものです。これらは、おそらく最も多用するであろう２番目のタイプです。
    * 例えば、`404`は「Not Found」レスポンスです。
    * クライアントからの一般的なエラーについては、`400`を使用することができます。
* `500`以上はサーバーエラーのためのものです。これらを直接使うことはほとんどありません。アプリケーションコードやサーバーのどこかで何か問題が発生した場合、これらのステータスコードのいずれかが自動的に返されます。

/// tip | 豆知識

	producer sarama.SyncProducer
	kconfig  Config
	config   *sarama.Config
}

func (h *Target) validate() error {
	if len(h.kconfig.Brokers) == 0 {
		return errors.New("no broker address found")
	}
	for _, b := range h.kconfig.Brokers {
		if _, err := xnet.ParseHost(b.String()); err != nil {
			return err
		}
	}
	return nil
}

// Name returns the name of the target

		for i := range len(piece) {
			switch {
			case (piece[i] >= 'a' && piece[i] <= 'z' ||
				piece[i] == '-'):
				// Found a non-digit character, so
				// this piece is not a number.
				isNotNumber = true
			case piece[i] >= '0' && piece[i] <= '9':
				// Nothing to do.
			default:
				// Found invalid character.
				return false
			}
		}
		allNumbers = allNumbers && !isNotNumber
	}

* que una query de base de datos devuelva los resultados
* etc.

Como el tiempo de ejecución se consume principalmente esperando operaciones de <abbr title="Input and Output – Entrada y salida">I/O</abbr>, las llaman operaciones "I/O bound".

Go 1.22 changed how the runtime interacts with transparent huge pages on Linux.
In particular, a common default Linux kernel configuration can result in
significant memory overheads, and Go 1.22 no longer works around this default.
To work around this issue without adjusting kernel settings, transparent huge
pages can be disabled for Go memory with the
[`disablethp` setting](/pkg/runtime#hdr-Environment_Variables).

// Copyright 2010 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package zip

import (
	"bufio"
	"encoding/binary"
	"errors"
	"fmt"
	"hash"
	"hash/crc32"
	"internal/godebug"
	"io"
	"io/fs"
	"os"
	"path"
	"path/filepath"
	"slices"
	"strings"
	"sync"
	"time"
)

<img src="/img/tutorial/body/image03.png">

You also get error checks for incorrect type operations:

<img src="/img/tutorial/body/image04.png">

This is not by chance, the whole framework was built around that design.

And it was thoroughly tested at the design phase, before any implementation, to ensure it would work with all the editors.

There were even some changes to Pydantic itself to support this.

		"",
	)

	ErrNoCertsAndHTTPSEndpoints = newErrFn(
		"HTTPS specified in endpoints, but no TLS certificate is found on the local machine",
		"Please add TLS certificate or use HTTP endpoints only",

	mutex sync.Mutex
	// Map of locks, with negative value indicating (exclusive) write lock
	// and positive values indicating number of read locks
	lockMap map[string]int64

	// Refresh returns lock not found if set to true
	lockNotFound bool

	// Set to true if you want peers servers to do not respond
	responseDelay int64
}

func (l *lockServer) setRefreshReply(refreshed bool) {
	l.mutex.Lock()

	if !sourceFailed && !targetFailed {
		ssum := srcSha256.Sum(nil)
		tsum := tgtSha256.Sum(nil)
		allgood = bytes.Equal(ssum, tsum)
		if !allgood {
			fmt.Printf("sha256 sum mismatch: %s -> Expected(%x), Found(%x)\n", srcCtnt.Key, ssum, tsum)
		}
	}

	return allgood