### Question:
CompressionEncodingFilter implements EncodingFilter { @Override public boolean applyDecoding(final HttpHeader httpPacket) { if (!httpPacket.isRequest()) { return false; } assert httpPacket instanceof HttpRequestPacket; return canDecompressHttpRequest((HttpRequestPacket) httpPacket, compressionConfig, aliases); } CompressionEncodingFilter(final CompressionConfig compressionConfig, final String[] aliases);  CompressionEncodingFilter(CompressionModeI compressionMode, int compressionMinSize, String[] compressibleMimeTypes, String[] noCompressionUserAgents,
            String[] aliases);  CompressionEncodingFilter(CompressionModeI compressionMode, int compressionMinSize, String[] compressibleMimeTypes, String[] noCompressionUserAgents,
            String[] aliases, boolean enableDecompression); @Override boolean applyEncoding(final HttpHeader httpPacket); @Override boolean applyDecoding(final HttpHeader httpPacket);  }### Answer:
@Test public void testContentEncodingProcessing() throws Exception { final CompressionEncodingFilter filter = new CompressionEncodingFilter(CompressionMode.ON, 1, new String[0], new String[0], new String[] { "gzip" }, true); HttpRequestPacket request = setContentEncoding(HttpRequestPacket.builder().method(Method.GET).protocol(Protocol.HTTP_1_1).uri("/").build(), "gzip"); assertTrue(filter.applyDecoding(request)); request = setContentEncoding(HttpRequestPacket.builder().method(Method.GET).protocol(Protocol.HTTP_1_1).uri("/").build(), "identity"); assertFalse(filter.applyDecoding(request)); request = HttpRequestPacket.builder().method(Method.GET).protocol(Protocol.HTTP_1_1).uri("/").build(); assertFalse(filter.applyDecoding(request)); }