Hello!

On Thu, Aug 02, 2018 at 01:46:35PM +0000, Friscia, Michael wrote:

> I’m trying to figure out why my sub_filter is not working on a
> JSON file. I do have application/json and text/json listed in
> the sub_filter_types but the simple string replace is not
> happening. It causes me to think that for whatever reason, Nginx
> is not seeing this file as JSON. Is there a way to output what
> mime type the file from the upstream server is so I can make
> sure I have the right filter type?
>
> Or, is there something I should also be doing to make the
> sub_filter work on a JSON file?

Some things to check, in no particular order:

- The Content-Type header as sent by the upstream server is
correct. Check the response headers in your favorite client to
see the Content-Type header (you can also log
$sent_http_content_type or $upstream_http_content_type, but
usually checking response headers is enough).

- The Content-Type in question is listed in the sub_filter_types
directive.

- The response is not compressed by the upstream server. If it
is, consider adding `proxy_set_header Accept-Encoding "";` to
the configuration.

--
Maxim Dounin
http://mdounin.ru/
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