add cloudflare connecting ip to self info plugin

[winneratwin]

Is your feature request related to a problem? Please describe.

it doesn't show the correct ip behind cloudflare

Describe the solution you'd like

add Cf-Connecting-Ip header to the list of headers that the self info plugin uses when the query is ip

Describe alternatives you've considered

there is another header True-Client-IP in cloudflare enterprise plan but the Cf-Connecting-Ip header is always active

Additional context

none required

[unixfox]

Searx is usually run behind a reverse proxy, so you must configure your reverse proxy to forward the given client IP address by cloudflare to Searx.

In no way this is Searx fault.

[return42]

OT: Cloudflare violates privacy, hosting SearXNG on is a bad idea / searx/searx#1965 (comment)

Further see:

• http://crimeflare.eu.org
• https://git.nogafam.es/deCloudflare/deCloudflare/src/branch/master/subfiles/the_trouble_with_codeberg.md

[dalf]

At this line

searxng/searx/plugins/self_info.py

Line 37 in feef577

x_forwarded_for = request.headers.getlist("X-Forwarded-For")

you can replace X-Forwarded-For by Cf-Connecting-Ip, it should work.

But it won't be supported in this repository for the reasons described above.