// Anonymous request return quickly.
	if accessKey == "" || secretKey == "" {
		return req, nil
	}

	for k, v := range headers {
		req.Header.Set(k, v)
	}

	err = signRequestV2(req, accessKey, secretKey)
	if err != nil {
		return nil, err
	}

	return req, nil
}

// Returns new HTTP request object signed with signature v4.

                buf.append(c);
            }
        }
        return buf.toString().trim();
    }

    /**
     * Parses the XML content from the provided {@link AccessResultData} and returns a map of the data.
     *
     * @param accessResultData the data containing the XML content to be parsed
     * @return a map containing the parsed data from the XML content

        }
      }
      return unmodifiableMap(ret);
    }
  }

  /** Returns whether any of the values in {@code dataset} are {@code NaN}. */
  private static boolean containsNaN(double... dataset) {
    for (double value : dataset) {
      if (Double.isNaN(value)) {
        return true;
      }
    }
    return false;
  }

  /**

     * Retrieves all duplicate host configurations without pagination.
     *
     * <p>This method returns all duplicate host configurations in the system,
     * ordered by sort order, regular name, and duplicate hostname. The results
     * are limited by the configured maximum fetch size to prevent memory issues.</p>
     *
     * @return a list of all DuplicateHost entities
     */
    public List<DuplicateHost> getDuplicateHostList() {

          name == TE &&
          headers.value(i) == "trailers"
        ) {
          result.add(Header(name, headers.value(i)))
        }
      }
      return result
    }

    /** Returns headers for a name value block containing an HTTP/2 response. */
    fun readHttp2HeadersList(
      headerBlock: Headers,
      protocol: Protocol,
    ): Response.Builder {

                    return true;
                }
            }
        }
        return false;
    }

    private boolean isBeforeOrAfterPhase(String task) {
        return task.startsWith(Lifecycle.BEFORE) || task.startsWith(Lifecycle.AFTER);
    }

    private boolean isGoalSpecification(String task) {
        return task.indexOf(':') >= 0;
    }

    return emptySet();
  }

  protected Collection<Method> suppressForConcurrentLinkedDeque() {
    return emptySet();
  }

  protected Collection<Method> suppressForConcurrentLinkedQueue() {
    return emptySet();
  }

  protected Collection<Method> suppressForLinkedBlockingDeque() {
    return emptySet();
  }

  protected Collection<Method> suppressForLinkedBlockingQueue() {
    return emptySet();
  }

				"x-amz-meta-key": []string{"amz-meta1", "amz-meta2"},
			},
			metadata: map[string]string{
				"x-amz-meta-key": "amz-meta1,amz-meta2",
			},
			shouldFail: false,
		},
		// Empty header input returns empty metadata.
		{
			header:     nil,
			metadata:   nil,
			shouldFail: true,
		},
	}

	// Validate if the extracting headers.
	for i, testCase := range testCases {

	debug                          bool
	versions                       bool
	insecure                       bool
)

// getMD5Sum returns MD5 sum of given data.
func getMD5Sum(data []byte) []byte {
	hash := md5.New()
	hash.Write(data)
	return hash.Sum(nil)
}

func main() {
	flag.StringVar(&endpoint, "endpoint", "https://play.min.io", "S3 endpoint URL")

That way, using `secrets.compare_digest()` in your application code, it will be safe against this whole range of security attacks.

### Return the error { #return-the-error }

After detecting that the credentials are incorrect, return an `HTTPException` with a status code 401 (the same returned when no credentials are provided) and add the header `WWW-Authenticate` to make the browser show the login prompt again: