A few days ago, when I was working on a project, I encountered a garbled return from the feign call, which caused a program error. The reason is that the dependency version of cloud is too low, and feign does not support gzip decoding. Without upgrading the jar, a filter was added.

code show as below:

public class FeignResponseDecoder implements Decoder {
    private final Decoder delegate;
 
    public FeignResponseDecoder(Decoder delegate) {
        Objects.requireNonNull(delegate, "Decoder must not be null. ");
        this.delegate = delegate;
    }
 
    @Override
    public Object decode(Response response, Type type) throws IOException {
        Collection<String> values = response.headers().get(HttpEncoding.CONTENT_ENCODING_HEADER);
        if (Objects.nonNull(values) && !values.isEmpty() && values.contains(HttpEncoding.GZIP_ENCODING)) {
            byte[] compressed = Util.toByteArray(response.body().asInputStream());
            if ((compressed == null) || (compressed.length == 0)) {
                return delegate.decode(response, type);
            }
            //decompression part
            //after decompress we are delegating the decompressed response to default
            //decoder
            if (isCompressed(compressed)) {
                final StringBuilder output = new StringBuilder();
                final GZIPInputStream gis = new GZIPInputStream(new ByteArrayInputStream(compressed));
                final BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(gis, StandardCharsets.UTF_8));
                String line;
                while ((line = bufferedReader.readLine()) != null) {
                    output.append(line);
                }
                Response uncompressedResponse = response.toBuilder().body(output.toString().getBytes()).build();
                return delegate.decode(uncompressedResponse, type);
            } else {
                return delegate.decode(response, type);
            }
        } else {
            return delegate.decode(response, type);
        }
    }
 
    private static boolean isCompressed(final byte[] compressed) {
        return (compressed[0] == (byte) (GZIPInputStream.GZIP_MAGIC)) && (compressed[1] == (byte) (GZIPInputStream.GZIP_MAGIC >> 8));
    }
}

Then inject this class as a bean:

@Bean
public Decoder GZIPResponseDecoder(ObjectFactory<HttpMessageConverters> messageConverters) {
    Decoder decoder = new FeignResponseDecoder(new SpringDecoder(messageConverters));
    return decoder;
}

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