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Nginx 1.18 - sub_filter + if statement

Ahmed Sajid
September 10, 2020 06:46PM
Hi All,

Not sure if this question has been answered before. The only evidence I could find was a StackExchange question https://serverfault.com/questions/774750/use-of-sub-filter-in-if-block-under-nginx-config with no answer.

Here's what I'm trying to accomplish:

* If the request is coming from a specific using agent, set override var to 1
* under location block if override is 1 only then apply sub_filter

Here's the snippet:

if ($http_user_agent = 'HTTPie/1.0.3') {
set $override_content 1;

location / {
proxy_set_header Accept-Encoding "";
proxy_pass $upstream_endpoint;
if ($override_content = 1) {
sub_filter 'abcabcabcabc' 'xyzxyzxyzxyz';
sub_filter_types 'application/json';
sub_filter_once off;

I get error nginx: [emerg] "sub_filter" directive is not allowed here

When I remove the if block, there's no complain or error and Nginx runs fine.

Any idea why this doesn't work?

Best Regards,

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Subject Author Posted

Nginx 1.18 - sub_filter + if statement

Ahmed Sajid September 10, 2020 06:46PM

Re: Nginx 1.18 - sub_filter + if statement

J.R. September 10, 2020 07:40PM

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