Если у вас есть достаточно технических знаний (сопрограммы, потоки, блокировки и т.д.) и вам интересно, как FastAPI обрабатывает `async def` по сравнению с обычным `def`, — вперёд.

///

### Функции-обработчики пути { #path-operation-functions }

Когда вы объявляете *функцию-обработчик пути* обычным `def` вместо `async def`, она запускается во внешнем пуле потоков, который затем «ожидается», вместо прямого вызова (прямой вызов заблокировал бы сервер).

Kullanım şekli oldukça basit. Örneğin bir `GET` isteği yapmak için aşağıdaki yeterli:

```Python
response = requests.get("http://example.com/some/url")
```

Bunun FastAPI'deki API <abbr title="Yol İşlemi: Path Operation">*yol işlemi*</abbr> şöyle görünür:

```Python hl_lines="1"
@app.get("/some/url")
def read_url():
    return {"message": "Hello World!"}
```

    *   New endpoints in tf.math namespace: `tf.math.acos`, `tf.math.acosh`,
        `tf.math.add`, `tf.math.asin`, `tf.math.asinh`, `tf.math.atan`,
        `tf.math.atan2`, `tf.math.atanh`, `tf.math.betainc`, `tf.math.ceil`,
        `tf.math.cos`, `tf.math.cosh`, `tf.math.digamma`, `tf.math.equal`,
        `tf.math.erfc`, `tf.math.exp`, `tf.math.expm1`, `tf.math.floor`,
        `tf.math.greater`, `tf.math.greater_equal`, `tf.math.igamma`,

// along with this program.  If not, see <http://www.gnu.org/licenses/>.

package cmd

import (
	"bytes"
	"context"
	"encoding/base64"
	"errors"
	"fmt"
	"io"
	"maps"
	"net/http"
	"path"
	"runtime"
	"slices"
	"sort"
	"strconv"
	"strings"
	"sync"
	"time"

	"github.com/klauspost/readahead"
	"github.com/minio/madmin-go/v3"
	"github.com/minio/minio-go/v7/pkg/tags"

pkg path/filepath (darwin-amd64-cgo), const Separator = 47
pkg path/filepath (freebsd-386), const ListSeparator = 58
pkg path/filepath (freebsd-386), const Separator = 47
pkg path/filepath (freebsd-386-cgo), const ListSeparator = 58
pkg path/filepath (freebsd-386-cgo), const Separator = 47
pkg path/filepath (freebsd-amd64), const ListSeparator = 58
pkg path/filepath (freebsd-amd64), const Separator = 47

<!--{
	"Title": "The Go Memory Model",
	"Subtitle": "Version of June 6, 2022",
	"Path": "/ref/mem"
}-->

<style>
p.rule {
  font-style: italic;
}
</style>

<h2 id="introduction">Introduction</h2>

<p>
The Go memory model specifies the conditions under which
reads of a variable in one goroutine can be guaranteed to
observe values produced by writes to the same variable in a different goroutine.
</p>

Se você tem certo conhecimento técnico (corrotinas, threads, blocking etc) e está curioso sobre como o FastAPI controla o `async def` vs normal `def`, vá em frente.

///

### Funções de operação de rota { #path-operation-functions }

// along with this program.  If not, see <http://www.gnu.org/licenses/>.

package grid

import (
	"bytes"
	"context"
	"encoding/binary"
	"errors"
	"fmt"
	"io"
	"math"
	"math/rand"
	"net"
	"runtime"
	"runtime/debug"
	"strings"
	"sync"
	"sync/atomic"
	"time"

	"github.com/gobwas/ws"
	"github.com/gobwas/ws/wsutil"
	"github.com/google/uuid"

package main

import (
	"bytes"
	"crypto/md5"
	"encoding/base64"
	"encoding/binary"
	"encoding/hex"
	"encoding/json"
	"errors"
	"fmt"
	"io"
	"log"
	"os"
	"path/filepath"
	"regexp"
	"slices"
	"sort"
	"strconv"
	"strings"
	"time"
	"unicode/utf8"

	"github.com/google/uuid"
	"github.com/klauspost/compress/zip"
	"github.com/klauspost/filepathx"

pkg os (darwin-arm64-cgo), const PathListSeparator = 58
pkg os (darwin-arm64-cgo), const PathSeparator = 47
pkg path/filepath (darwin-arm64), const ListSeparator = 58
pkg path/filepath (darwin-arm64), const Separator = 47
pkg path/filepath (darwin-arm64-cgo), const ListSeparator = 58
pkg path/filepath (darwin-arm64-cgo), const Separator = 47
pkg runtime (darwin-arm64), const GOARCH = "arm64"