i++
      } else if (input.startsWith(".", startIndex = i)) {
        // If we see a '.', rewind to the beginning of the previous group and parse as IPv4.
        if (!decodeIpv4Suffix(input, groupOffset, limit, address, b - 2)) return null
        b += 2 // We rewound two bytes and then added four.
        break
      } else {
        return null // Wrong delimiter.
      }
    }

			// Put the '\r' back on buf and drop it from line.
			// Let the next call to ReadLine check for "\r\n".
			if b.r == 0 {
				// should be unreachable
				panic("bufio: tried to rewind past start of buffer")
			}
			b.r--
			line = line[:len(line)-1]
		}
		return line, true, nil
	}

	if len(line) == 0 {
		if err != nil {
			line = nil
		}
		return
	}

        buffer.putInt(fileNameBytes.length);
        buffer.put(fileNameBytes);

        // Return only the used portion of the buffer
        byte[] result = new byte[buffer.position()];
        buffer.rewind();
        buffer.get(result);
        return result;
    }

    /**
     * Helper method to create a buffer with multiple notifications
     */

# Behind a Proxy { #behind-a-proxy }

In many situations, you would use a **proxy** like Traefik or Nginx in front of your FastAPI app.

These proxies could handle HTTPS certificates and other things.

## Proxy Forwarded Headers { #proxy-forwarded-headers }

[http://127.0.0.1:8000/docs](http://127.0.0.1:8000/docs)에서 확인할 수 있습니다:

<img src="/img/tutorial/behind-a-proxy/image01.png">

하지만 프록시(포트 `9999`)를 사용해 "공식" URL인 `/api/v1/docs`에서 docs UI에 접근하면, 올바르게 동작합니다! 🎉

[http://127.0.0.1:9999/api/v1/docs](http://127.0.0.1:9999/api/v1/docs)에서 확인할 수 있습니다:

<img src="/img/tutorial/behind-a-proxy/image02.png">

원하던 그대로입니다. ✔️

<img src="/img/tutorial/behind-a-proxy/image01.png">

Ancak docs UI'yi proxy üzerinden, `9999` portuyla, `/api/v1/docs` altında "resmi" URL'den açarsak doğru çalışır! 🎉

Şuradan kontrol edebilirsiniz: [http://127.0.0.1:9999/api/v1/docs](http://127.0.0.1:9999/api/v1/docs):

<img src="/img/tutorial/behind-a-proxy/image02.png">

Tam istediğimiz gibi. ✔️

<img src="/img/tutorial/behind-a-proxy/image01.png">

Wenn wir jedoch unter der „offiziellen“ URL, über den Proxy mit Port `9999`, unter `/api/v1/docs`, auf die Dokumentationsoberfläche zugreifen, funktioniert es ordnungsgemäß! 🎉

Sie können das unter [http://127.0.0.1:9999/api/v1/docs](http://127.0.0.1:9999/api/v1/docs) testen:

<img src="/img/tutorial/behind-a-proxy/image02.png">

你可以在 [http://127.0.0.1:8000/docs](http://127.0.0.1:8000/docs) 查看：

<img src="/img/tutorial/behind-a-proxy/image01.png">

但如果我们在“官方”URL（代理端口为 `9999`）的 `/api/v1/docs` 访问文档界面，它就能正常工作！🎉

你可以在 [http://127.0.0.1:9999/api/v1/docs](http://127.0.0.1:9999/api/v1/docs) 查看：

<img src="/img/tutorial/behind-a-proxy/image02.png">

完全符合我们的预期。✔️

<img src="/img/tutorial/behind-a-proxy/image01.png">

Mais si nous accédons à l'interface de documents à l'URL « officielle » en utilisant le proxy avec le port `9999`, à `/api/v1/docs`, cela fonctionne correctement ! 🎉

Vous pouvez le vérifier sur [http://127.0.0.1:9999/api/v1/docs](http://127.0.0.1:9999/api/v1/docs) :

<img src="/img/tutorial/behind-a-proxy/image02.png">

<img src="/img/tutorial/behind-a-proxy/image01.png">

Mas se acessarmos a interface de documentação no URL "oficial" usando o proxy com a porta `9999`, em `/api/v1/docs`, ela funciona corretamente! 🎉

Você pode verificar em [http://127.0.0.1:9999/api/v1/docs](http://127.0.0.1:9999/api/v1/docs):

<img src="/img/tutorial/behind-a-proxy/image02.png">

Exatamente como queríamos. ✔️