And also require HTTP. Also add `IPv6` to the keywords.
Fixing:
Linux AM openssl !ipv6 !--libcurl:
```
FAIL 1265: 'NO_PROXY with IPv6 numerical address' HTTP, HTTP proxy, http_proxy, NO_PROXY, noproxy
FAIL 1324: 'HTTP with --resolve and [ipv6address]' HTTP, HTTP GET, --resolve
FAIL 2086: 'Pre-request callback for HTTP IPv6' HTTP, IPv6
```
Ref: https://github.com/curl/curl/actions/runs/14378524385/job/40318328714?pr=17012#step:41:3789
Follow-up to a09e49168a#17005Closes#17014
Triggered before a request is made but after a connection is set up
Changes:
- callback: Update docs and callback for pre-request callback
- Add documentation for CURLOPT_PREREQDATA and CURLOPT_PREREQFUNCTION,
- Add redirect test and callback failure test
- Note that the function may be called multiple times on a redirection
- Disable new 2086 test due to Windows weirdness
Closes#7477