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Vary header

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26 Jan 2026, 4:31 PM

dml73

Zen Follower

Join Date:: Oct 2007
Posts:: 413
Plugin Contributions:: 0

Vary header

Bootstrap 3.7.7-beta1
PHP Version: 8.4.10

I'm using Cloudflare and they are telling me that for their png/jpg - webp image conversion function to work the only accepted Vary header is:

Vary: Accept-encoding

Is this possible / safe to set? and if, how would I do that?

27 Jan 2026, 11:56 AM

mprough

Totally Zenned

Join Date:: Nov 2007
Location:: Woodbine, Georgia, United States
Posts:: 4,280
Plugin Contributions:: 37

Re: Vary header

DML73:

Bootstrap 3.7.7-beta1
PHP Version: 8.4.10

I'm using Cloudflare and they are telling me that for their png/jpg - webp image conversion function to work the only accepted Vary header is:

Vary: Accept-encoding

Is this possible / safe to set? and if, how would I do that?

It is the PCI/DSS best practice =)

27 Jan 2026, 1:04 PM

dml73

Zen Follower

Join Date:: Oct 2007
Posts:: 413
Plugin Contributions:: 0

Re: Vary header

I just found out that I needed to disable server-side cacheing in my host, once I did that, Cloudflare png/jpg to webp conversion started working.