Ama yine de, FastAPI, Requests'ten oldukça ilham aldı.

**Requests**, <abbr title="API (Application Programming Interface): Uygulama Programlama Arayüzü">API'lar</abbr> ile bir istemci olarak *etkileşime geçmeyi* sağlayan bir kütüphaneyken **FastAPI** bir sunucu olarak <abbr title="API (Application Programming Interface): Uygulama Programlama Arayüzü">API'lar</abbr> oluşturmaya yarar.

```Python hl_lines="6"
{!../../docs_src/events/tutorial002.py!}
```

Hier schreibt die `shutdown`-Eventhandler-Funktion eine Textzeile `"Application shutdown"` in eine Datei `log.txt`.

/// info

INFO:     Uvicorn running on http://127.0.0.1:8000 (Press CTRL+C to quit)
INFO:     Started reloader process [28720]
INFO:     Started server process [28722]
INFO:     Waiting for application startup.
INFO:     Application startup complete.
```

</div>

<details markdown="1">
<summary>O komendzie <code>uvicorn main:app --reload</code>...</summary>
Komenda `uvicorn main:app` odnosi się do:

### `shutdown` 🎉

🚮 🔢 👈 🔜 🏃 🕐❔ 🈸 🤫 🔽, 📣 ⚫️ ⏮️ 🎉 `"shutdown"`:

```Python hl_lines="6"
{!../../docs_src/events/tutorial002.py!}
```

📥, `shutdown` 🎉 🐕‍🦺 🔢 🔜 ✍ ✍ ⏸ `"Application shutdown"` 📁 `log.txt`.

/// info

`open()` 🔢, `mode="a"` ⛓ "🎻",, ⏸ 🔜 🚮 ⏮️ ⚫️❔ 🔛 👈 📁, 🍵 📁 ⏮️ 🎚.

///

/// tip

👀 👈 👉 💼 👥 ⚙️ 🐩 🐍 `open()` 🔢 👈 🔗 ⏮️ 📁.

		return
	}

	// Ensure body content type is opaque to ensure that request body has not
	// been interpreted as form data.
	contentType := r.Header.Get("Content-Type")
	if contentType != "application/octet-stream" {
		writeErrorResponseJSON(ctx, w, errorCodes.ToAPIErr(ErrBadRequest), r.URL)
		return
	}

	password := cred.SecretKey

				err = fmt.Errorf("%s: %w", cleanErr.Error(), err)
			} else {
				err = cleanErr
			}
		}

		return
	},
}

// GetCommand returns the main cobra.Command object for this application
func GetCommand() *cobra.Command {
	return rootCmd
}

func init() {
	viper.AutomaticEnv()
	viper.AllowEmptyEnv(true)
	viper.SetEnvKeyReplacer(strings.NewReplacer("-", "_"))

Events
======

Events allow you to capture metrics on your application’s HTTP calls. Use events to monitor:

 * The size and frequency of the HTTP calls your application makes. If you’re making too many calls, or your calls are too large, you should know about it!
 * The performance of these calls on the underlying network. If the network’s performance isn’t sufficient, you need to either improve the network or use less of it.

### EventListener

    fun systemDns(systemDns: Dns) =
      apply {
        this.systemDns = systemDns
      }
  }

  companion object {
    val DNS_MESSAGE: MediaType = "application/dns-message".toMediaType()
    const val MAX_RESPONSE_SIZE = 64 * 1024

    private fun buildBootstrapClient(builder: Builder): Dns {
      val hosts = builder.bootstrapDnsHosts

      return if (hosts != null) {

          + "@:"; // The gendelim characters permitted in paths.

  /**
   * Returns an {@link Escaper} instance that escapes strings so they can be safely included in <a
   * href="https://url.spec.whatwg.org/#application-x-www-form-urlencoded-percent-encode-set">URL
   * form parameter names and values</a>. Escaping is performed with the UTF-8 character encoding.
   * The caller is responsible for <a

    "Operating System :: OS Independent",
    "Programming Language :: Python :: 3",
    "Programming Language :: Python",
    "Topic :: Internet",
    "Topic :: Software Development :: Libraries :: Application Frameworks",
    "Topic :: Software Development :: Libraries :: Python Modules",
    "Topic :: Software Development :: Libraries",
    "Topic :: Software Development",
    "Typing :: Typed",