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<p>Hi All,</p>
<p>Not sure if this question has been answered before. The only evidence I could find was a StackExchange question
<a class="moz-txt-link-freetext" href="https://serverfault.com/questions/774750/use-of-sub-filter-in-if-block-under-nginx-config">
https://serverfault.com/questions/774750/use-of-sub-filter-in-if-block-under-nginx-config</a> with no answer.</p>
<p>Here's what I'm trying to accomplish:</p>
<ul>
<li>If the request is coming from a specific using agent, set override var to 1</li><li>under location block if override is 1 only then apply sub_filter</li></ul>
<p>Here's the snippet:</p>
<p><font face="Courier New, Courier, monospace"> if ($http_user_agent = 'HTTPie/1.0.3') {<br>
set $override_content 1;<br>
}<br>
<br>
location / {<br>
proxy_set_header Accept-Encoding "";<br>
proxy_pass $upstream_endpoint;<br>
if ($override_content = 1) {<br>
sub_filter 'abcabcabcabc' 'xyzxyzxyzxyz';<br>
sub_filter_types 'application/json';<br>
sub_filter_once off;<br>
}<br>
}</font><br>
</p>
<p>I get error <b>nginx: [emerg] "sub_filter" directive is not allowed here</b></p>
<p>When I remove the <b>if</b> block, there's no complain or error and Nginx runs fine.<br>
</p>
<p>Any idea why this doesn't work?</p>
<p>Best Regards,<br>
Ahmed.<br>
</p>
<p><br>
</p>
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