Why nginx does not forward Vary header sent by Apache in proxy mode?

Question

I'm using Plesk (seems to be 17.8.11 provided by OVH) and nginx is configured as proxy. My PHP script returns images into WEBP format when the browser accept it, otherwise it returns orignal format (JPG or PNG).

In .htaccess I return header Vary: Accept so proxies know that the content depends on the Accept header.

In nginx settings of Plesk I only checked the 'Proxy mode' option, other checkboxes are cleared. When I fetch the image the Vary: Accept is not present, I cannot imagine that nginx does not handle this header, please help me to figure this out.

Answer 1

I finally found the reason: I was not sending "Vary: Accept" header for ".webp" extension, only for ".jpg" and ".png". My URLs ends with .jpg or .png, never .webp and this is working good with Apache. Here was my htaccess directives:

<IfModule mod_setenvif.c>
    SetEnvIf Request_URI "\.(jpe?g|png)$" REQUEST_image
</IfModule>
<IfModule mod_headers.c>
    Header append Vary Accept env=REQUEST_image
</IfModule>

To fix it I added .webp in URLs filter:

<IfModule mod_setenvif.c>
    SetEnvIf Request_URI "\.(jpe?g|png|webp)$" REQUEST_image
</IfModule>
<IfModule mod_headers.c>
    Header append Vary Accept env=REQUEST_image
</IfModule>

Now it's all good.