{* ../../docs_src/handling_errors/tutorial006_py39.py hl[2:5,15,21] *}

O OAuth2 foi projetado para que o backend ou a API pudesse ser independente do servidor que autentica o usuário.

Mas, neste caso, a mesma aplicação **FastAPI** irá lidar com a API e com a autenticação.

Então, vamos rever de um ponto de vista simplificado:

* O usuário digita o `username` e o `password` no frontend e pressiona `Enter`.

{* ../../docs_src/handling_errors/tutorial006_py39.py hl[2:5,15,21] *}

			}
			return written, nil
		}
	}
}

// SafeClose safely closes any channel of any type
func SafeClose[T any](c chan<- T) {
	if c != nil {
		close(c)
		return
	}
	// Print stack to check who is sending `c` as `nil`
	// without crashing the server.
	debug.PrintStack()

        // Prepare test data with minimal valid resource record
        byte[] src = new byte[100];
        int srcIndex = 10;

        // Set up a minimal resource record response
        // Name pointer (0xC00C)
        src[srcIndex] = (byte) 0xC0;
        src[srcIndex + 1] = 0x0C;
        // Record type (NBSTAT = 0x0021)
        src[srcIndex + 2] = 0x00;
        src[srcIndex + 3] = 0x21;

            when(mockNdrBuffer.dec_ndr_short()).thenReturn((int) (short) 0, (int) (short) 0);
            when(mockNdrBuffer.dec_ndr_long()).thenReturn(0); // Null referent pointer

            // When: Decoding the unicode string
            unicodeString.decode(mockNdrBuffer);

            // Then: Verify the decoding sequence and values
            verify(mockNdrBuffer).align(4);

			peers[i] = newPeerS3Client(node)
		}
		peers[i].SetPools(node.Pools)
	}

	return peers
}

// Returns a peer S3 client.
func newPeerS3Client(node Node) peerS3Client {
	var gridConn atomic.Pointer[grid.Connection]

	return &remotePeerS3Client{
		node: node,
		gridConn: func() *grid.Connection {
			// Lazy initialization of grid connection.

        }

        DfsReferralDataInternal dr = null;
        final long now = System.currentTimeMillis();
        synchronized (this.domainsLock) {
            /*
             * domains that can contain DFS points to maps of roots for each
             */
            final Map<String, Map<String, CacheEntry<DfsReferralDataInternal>>> domains = getTrustedDomains(tf);
            if (domains != null) {

		return err
	}

	// Build Go for Android.
	cmd = exec.Command(goTool, "install", "cmd")
	out, err = cmd.CombinedOutput()
	if err != nil {
		if len(bytes.TrimSpace(out)) > 0 {
			log.Printf("\n%s", out)
		}
		return fmt.Errorf("%v: %w", cmd, err)
	}
	if err := adb("exec-out", "mkdir", "-p", deviceGoroot); err != nil {
		return err
	}

				"video/daala",
				"video/theora",
				"video/x-dirac",
				"video/x-ogm",
				"video/x-ogguvs",
				"video/x-oggyuv",
				"video/x-oggrgb",
				"video/parityfec",
				"video/pointer",
				"video/quicktime",
				"video/raw",
				"video/rtp-enc-aescm128",
				"video/rtx",
				"video/smpte292m",
				"video/ulpfec",
				"video/vc1",
				"video/vnd.cctv",