Francis,

That was it! The subsequent, asynchronous AJAX call was responding with a Javascript redirect that was remedied using Nginx's sub_filter directive.

location / {
resolver 103.86.99.100;
proxy_bind $server_addr;
proxy_pass https://$host$request_uri;
proxy_redirect https:// http://;
proxy_set_header Accept-Encoding ""; # Needed by sub_filter to disable gzip compression
sub_filter_types text/javascript text/css text/xml;
sub_filter 'https:' 'http:';
sub_filter_once off;
}

The combination of disabling gzip compression, adding sub_filter_types text/javascript, and creating sub_filter 'https:' 'http:' rewrote the protocol of the Javascript redirect.

{"url":"http:\/\/z1.fm\/download\/3298838","isSuccess":1}

Then, I was able to download MP3's by simply clicking the AJAX link.

Hope this helps someone in the future.

Respectfully,


Gary