byte[] compressed = compressionService.compress(testData, CompressionService.COMPRESSION_LZ77);
        assertNotNull(compressed);
        assertTrue(compressed.length > 0);
        // Compressed size should typically be smaller (though not guaranteed for all data)

        byte[] decompressed = compressionService.decompress(compressed, CompressionService.COMPRESSION_LZ77);

    /**
     * Compresses data using the specified algorithm.
     *
     * @param data the data to compress
     * @param algorithm the compression algorithm to use
     * @return the compressed data
     * @throws CIFSException if compression fails
     */
    byte[] compress(byte[] data, int algorithm) throws CIFSException;

    /**
     * Compresses data using the specified algorithm with offset and length.

    }

    /**
     * Decompresses GZIP-compressed data.
     *
     * @param compressed The GZIP-compressed data to decompress
     * @return Decompressed data
     * @throws IORuntimeException if decompression fails
     */
    protected byte[] gzipDecompress(final byte[] compressed) {
        try (final ByteArrayInputStream bis = new ByteArrayInputStream(compressed);

            return "[" + address + "]";
        }
        return address;
    }

    /**
     * Compresses an IPv6 address string to its canonical compressed form.
     * For example, "0:0:0:0:0:0:0:1" becomes "::1"
     *
     * @param ipv6Address the IPv6 address string to compress
     * @return the compressed IPv6 address string
     */
    protected static String compressIPv6(final String ipv6Address) {

            throws CIFSException {
        byte[] decompressed = decompress(compressedData, offset, length, algorithm);
        if (outputBuffer.length - outputOffset < decompressed.length) {
            throw new CIFSException("Output buffer too small");
        }
        System.arraycopy(decompressed, 0, outputBuffer, outputOffset, decompressed.length);
        return decompressed.length;
    }

    @Override

      decompress(response)
    } else {
      chain.proceed(chain.request())
    }

  /**
   * Returns a decompressed copy of the Response, typically via a streaming Source.
   * If no known decompression or the response is not compressed, returns the response unmodified.
   */
  internal fun decompress(response: Response): Response {
    if (!response.promisesBody()) {
      return response

    callback.assertTextMessage("Hello")
  }

  @Test fun serverWithCompressionCompressedHelloTwoChunks() {
    data.write("418460b420bb92fced72".decodeHex()) // first 4 bytes of compressed 'Hello'
    data.write("80833851d9d4f156d9".decodeHex()) // last 3 bytes of compressed 'Hello'
    serverReaderWithCompression.processNextFrame()
    callback.assertTextMessage("Hello")
  }

  @Test fun clientTwoFrameHello() {

If there's no `gzip` in the header, it will not try to decompress the body.

That way, the same route class can handle gzip compressed or uncompressed requests.

{* ../../docs_src/custom_request_and_route/tutorial001_an_py310.py hl[9:16] *}

### Create a custom `GzipRoute` class { #create-a-custom-gziproute-class }

	Spectre    = flag.String("spectre", "", "enable spectre mitigations in `list` (all, ret)")
)

var DebugFlags struct {
	CompressInstructions int    `help:"use compressed instructions when possible (if supported by architecture)"`
	MayMoreStack         string `help:"call named function before all stack growth checks"`

		return io.ErrUnexpectedEOF
	}
	ver := int(b[0])
	switch ver {
	case dataUsageCacheVerV1:
		return errors.New("cache version deprecated (will autoupdate)")
	case dataUsageCacheVerV2:
		// Zstd compressed.
		dec, err := zstd.NewReader(r, zstd.WithDecoderConcurrency(2))
		if err != nil {
			return err
		}
		defer dec.Close()

		dold := &dataUsageCacheV2{}