return compressLZ77Huffman(data, offset, length);

        case COMPRESSION_LZNT1:
            throw new CIFSException("LZNT1 compression not yet implemented");

        case COMPRESSION_PATTERN_V1:
            throw new CIFSException("Pattern_V1 compression not yet implemented");

        default:
            throw new CIFSException("Unknown compression algorithm: " + algorithm);
        }
    }

    @Override

/// warning

This page hasn’t been translated into your language yet. 🌍

We’re currently switching to an automated translation system 🤖, which will help keep all translations complete and up to date.

Learn more: [Contributing – Translations](https://fastapi.tiangolo.com/contributing/#translations){.internal-link target=_blank}

<img src="/img/tutorial/security/image02.png">

/// note

It doesn't matter what you type in the form, it won't work yet. But we'll get there.

///

This is of course not the frontend for the final users, but it's a great automatic tool to document interactively all your API.

It can be used by the frontend team (that can also be yourself).

                  </div>
                </div>
                </p>
                <p>
                If change was made on the `release` branch but hasn't yet been published to the baseline version, update the baseline version:

}

func TestHeadersAlreadyWritten(t *testing.T) {
	rw := httptest.NewRecorder()
	trw := &trackingResponseWriter{ResponseWriter: rw}

	if headersAlreadyWritten(trw) {
		t.Fatal("headers have not been written yet")
	}

	trw.WriteHeader(123)
	if !headersAlreadyWritten(trw) {
		t.Fatal("headers were written")
	}
}

func TestHeadersAlreadyWrittenWrapped(t *testing.T) {
	rw := httptest.NewRecorder()

          .that(returnType.getComponentType())
          .isEqualTo(annotationClass.getDeclaringClass());
    }
  }

  // This is public so that tests for Feature enums we haven't yet imagined
  // can reuse it.
  public static <E extends Enum<?> & Feature<?>> void assertGoodFeatureEnum(
      Class<E> featureEnumClass) {
    Class<?>[] classes = featureEnumClass.getDeclaredClasses();

///

## Returning a custom `Response` { #returning-a-custom-response }

The example above shows all the parts you need, but it's not very useful yet, as you could have just returned the `item` directly, and **FastAPI** would put it in a `JSONResponse` for you, converting it to a `dict`, etc. All that by default.

Now, let's see how you could use that to return a custom response.

func bucketUsageMetricsPrometheus(ch chan<- prometheus.Metric) {
	objLayer := newObjectLayerFn()
	// Service not initialized yet
	if objLayer == nil {
		return
	}

	dataUsageInfo, err := loadDataUsageFromBackend(GlobalContext, objLayer)
	if err != nil {
		return
	}
	// data usage has not captured any data yet.
	if dataUsageInfo.LastUpdate.IsZero() {
		return
	}

            ActionListener<SearchResponse> listener) {
        throw new UnsupportedOperationException("Not implemented yet");
    }

    @Override
    public ActionFuture<SearchResponse> searchView(org.opensearch.action.admin.indices.view.SearchViewAction.Request request) {
        throw new UnsupportedOperationException("Not implemented yet");
    }

    @Override

///

Then you could call that Python program:

//// tab | Linux, macOS, Windows Bash

<div class="termy">

```console
// Here we don't set the env var yet
$ python main.py

// As we didn't set the env var, we get the default value

Hello World from Python

// But if we create an environment variable first
$ export MY_NAME="Wade Wilson"