what needs to happen to move forward with this? :)

i tested this with my application and can confirm that everything is working as expected so far for me 👍

I'll review this while I'm on holiday, coming up in a couple of weeks, and will merge it then. It might require a new major version, which I'm happy to tag for this.

We have an interesting history with these kinds of requests, and I bet @shadowhand would agree with me that we are way overdue to accept this. 😁

I'm going to tag a bunch of issues and PRs from over the years here, just to connect things together:

• Introducing HTTPlug #475
• Implement HTTPlug #538
• Allow another HTTP client #652
• Support using different HTTP Clients through PSR-17 and PSR-18 #685
• Set custom User-Agent for requests #698
• make option "verify" also without parameter proxy available #704
• Send additional options to Guzzle #863
• feat: PSR18 #885

Don't worry about the test failures on PHP 7.1 and earlier. If I tag this for a new major version, I'll be dropping support for everything before PHP 8.1.

I'll fix the unit tests errors running on 8.1+

Codecov Report

All modified and coverable lines are covered by tests ✅

Please upload report for BASE (3.x@c8cc03e). Learn more about missing BASE report.

@@          Coverage Diff           @@
##             3.x    #1032   +/-   ##
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  Coverage       ?   99.03%           
  Complexity     ?      195           
======================================
  Files          ?       19           
  Lines          ?      517           
  Branches       ?        0           
======================================
  Hits           ?      512           
  Misses         ?        5           
  Partials       ?        0           

@flavioheleno FYI, I've created a 3.x branch that targets PHP 8.1+, and I've repointed the based of this branch to 3.x and resolved the conflicts in composer.json.