Use `Cache-Control: no-transform` to disable Cloudflare auto minify

[wxiaoguang]

Many users report that all the tab/space in code disappear. The code indent/indentation become messy.

The reason is that they put Gitea behind Cloudflare, and they enabled the auto minify feature on Cloudflare.

The workaround is to disable the auto minify feature on Cloudflare.

Also, Cloudflare has an option to disable the auto minify: Cache-Control: no-transform

Issues:

• Code indents not displaying properly #14062
  and more

Ref:

• https://community.cloudflare.com/t/disable-minification-with-header/15294
• https://support.cloudflare.com/hc/en-us/articles/200168396-What-will-Cloudflare-compress-

[tankerkiller125]

Reading through the docs this will also disable gzip/brotli compression, which I don't think is necessarily what you would want to do?

[silverwind]

Whitespace in HTML is often times significant, I think it's a bug on CF if they remove significant whitespace and break sites that way.

Anyways, I would not be opposed to adding no-transform to text/html responses only.

[wxiaoguang]

Reading through the docs this will also disable gzip/brotli compression, which I don't think is necessarily what you would want to do?

It won't be a problem. Gitea has builtin ENABLE_GZIP support.

[zeripath]

Is it possible that if we use <pre> instead of just relying on CSS pre cloudfare would just do the correct thing?

[wxiaoguang]

I have no idea about whether Cloudflare affects the content inside <pre> or <textarea>. I didn't find related documents about this topic.

[silverwind]

Is it possible that if we use <pre> instead of just relying on CSS pre cloudfare would just do the correct thing?

Depends on which HTML minfier they are using, but I suspect it might help, but I'm not sure if the introduction of <pre> will break other things. I think we could do a common <pre> ancestor to code view, similar to how GitLab does it. GitHub itself has no <pre> ancestor to their code views so should be affected by this "bug" too.