The nginx connection hangs until timeout for the following nginx configuration:
header_filter_type 'java';
header_filter_name 'MyHeaderFilter'
proxy_http_version 1.1;
proxy_buffering off;

Note the curl output in verbose mode shows:

Transfer-Encoding: chunked

It works fine if I remove the header filter.

It also works fine if I make any of the following changes:

1. change proxy_buffering to on
2. change proxy_http_version to 1.0
3. set Content-Length in response header

Note if I change proxy_http_version to 1.0 or set Content-Length in response header, the transfer encoding is no longer trunked. I am not sure this is related to the hanging issue. Even with trunked transfer encoding, it works fine if I change proxy_buffering to on.

For testing purpose, my filter class is simply:

public class MyFilter implements NginxJavaHeaderFilter {
@OverRide
public Object[] doFilter(int status, Map<String, Object> request, Map<String, Object> responseHeaders) throws IOException {
return Constants.PHASE_DONE;
}
}

My nginx version is 1.12.2 and my nginx-closure version is 0.4.5. You should be able to reproduce the issue easily.

This is a blocking issue for me as my customers use the above configuration for streaming large amount of data. Thanks for your help!

Jason