[1.x] http request header

[brianteeman]

code review

Mozilla telemetry indicates that there is less than 0.24% still using 1.0 https://mzl.la/3tFMtkA

httparchive didnt even include 1.0 in its 2020 almanac https://almanac.httparchive.org/en/2020/http#fig-3 but in 2019 they reported less than 0.06%

Also see https://github.com/joomla/joomla-cms/pull/35568

[nibra]

Thank you!