* O frontend precisa buscar mais dados daquela API.
		* Mas precisa de autenticação para aquele endpoint em específico.
		* Então, para autenticar com nossa API, ele manda um header de `Autorização` com o valor `Bearer` mais o token.
		* Se o token contém `foobar`, o conteúdo do header de `Autorização` será: `Bearer foobar`.

## **FastAPI**'s `OAuth2PasswordBearer`

///

/// info

In diesem Beispiel verwenden wir zwei erfundene benutzerdefinierte Header `X-Key` und `X-Token`.

        )
      socket.source.timeout().timeout(readTimeoutMillis.toLong(), TimeUnit.MILLISECONDS)
      socket.sink.timeout().timeout(writeTimeoutMillis.toLong(), TimeUnit.MILLISECONDS)
      tunnelCodec.writeRequest(nextRequest.headers, requestLine)
      tunnelCodec.finishRequest()
      val response =
        tunnelCodec
          .readResponseHeaders(false)!!
          .request(nextRequest)
          .build()

* .
* **OAuth2** (همچنین با **JWT tokens**). آموزش را در [OAuth2 with JWT](tutorial/security/oauth2-jwt.md){.internal-link target=\_blank} مشاهده کنید.
* کلید های API:
    * <abbr title="سرصفحه ها">Headers</abbr>
    * <abbr title="پارامترهای پرسمان">Query parameters</abbr>
    * <abbr title="کوکی ها">Cookies</abbr>، و غیره.

		},
		// Test case - 3.
		// Test case with valid "X-Amz-Algorithm" query value, but invalid  "X-Amz-Credential" header.
		// Malformed crenential.
		{
			inputQueryKeyVals: []string{
				// valid  "X-Amz-Algorithm" header.
				"X-Amz-Algorithm", signV4Algorithm,
				// valid  "X-Amz-Credential" header.
				"X-Amz-Credential", "invalid-credential",
				"X-Amz-Signature", "",
				"X-Amz-Date", "",

	return fmt.Errorf("%w (offline-disks=%d/%d)", writeErr, countErrs(p.errs, errDiskNotFound), len(p.writers))
}

// Encode reads from the reader, erasure-encodes the data and writes to the writers.
func (e *Erasure) Encode(ctx context.Context, src io.Reader, writers []io.Writer, buf []byte, quorum int) (total int64, err error) {
	writer := &multiWriter{
		writers:     writers,
		writeQuorum: quorum,

    * JSON.
    * Yol parametreleri.
    * Sorgu parametreleri.
    * Çerezler.
    * Headers.
    * Formlar.
    * Dosyalar.
* Giden verinin <abbr title="Dönüşüm: serialization, parsing, marshalling olarak da biliniyor">dönüşümünü</abbr> aşağıdaki veri tiplerini kullanarak gerçekleştirir (JSON olarak):

        prop.load(inStream);
        properties = prop;
    }

    @Override
    public synchronized void load(final Reader reader) throws IOException {
        final Properties prop = new Properties();
        lastModified = propertiesFile.lastModified();
        prop.load(reader);
        properties = prop;
    }

    @Override

* El frontend necesita obtener más datos de la API.
    * Pero necesita autenticación para ese endpoint específico.
    * Así que, para autenticarse con nuestra API, envía un `header` `Authorization` con un valor de `Bearer ` más el token.
    * Si el token contiene `foobar`, el contenido del `header` `Authorization` sería: `Bearer foobar`.

## `OAuth2PasswordBearer` de **FastAPI**

     * Get the value for the key 'searchlog.request.headers'. <br>
     * The value is, e.g.  <br>
     * comment: Request headers to include in search log.
     * @return The value of found property. (NotNull: if not found, exception but basically no way)
     */
    String getSearchlogRequestHeaders();

    /**
     * Get the value for the key 'searchlog.request.headers' as {@link Integer}. <br>
     * The value is, e.g.  <br>