@jeffkaufman updated & force pushed
I can reproduce a form of gzip trouble on the current master with this:
```
http {
   include       mime.types;
   default_type  application/octet-stream;

   gzip  on;
   pagespeed FileCachePath /tmp/ngx_pagespeed_cache;

   server {
        listen       7002;
        pagespeed on;
        location / {
                 proxy_pass http://www.jefftk.com/;
        }
    }
}
```

Applying these few lines to master fixes that (not copying headers with when their hash is set to 0): https://github.com/pagespeed/ngx_pagespeed/pull/457/files#L2R209