Spring Integration GZIP HTTP requests

Question

I need to compress HTTP requests over outbound-gateway. Is there a GZIPInterceptor for Spring Integration or other thing for that?

Answer 1

There's nothing out of the box, but it's easy enough to add a pair of transformers to zip the payload before sending to the gateway...

@Bean
@Transformer(inputChannel = "gzipIt", outputChannel = "gzipped")
public byte[] gzip(byte[] in) throws IOException {
    ByteArrayOutputStream out = new ByteArrayOutputStream();
    GZIPOutputStream gzOut = new GZIPOutputStream(out);
    FileCopyUtils.copy(in, gzOut);
    return out.toByteArray();
}

and another to unzip...

@Bean
@Transformer(inputChannel = "gUnzipIt", outputChannel = "gUnzipped")
public byte[] gUnzip(byte[] in) throws IOException {
    ByteArrayOutputStream out = new ByteArrayOutputStream();
    GZIPInputStream gzIn = new GZIPInputStream(new ByteArrayInputStream(in));
    FileCopyUtils.copy(gzIn, out);
    return out.toByteArray();
}

You can also do it in a ClientHttpRequestInterceptor.

Also see the link in Artem's comment below.