bug #41224 [HttpClient] fix adding query string to relative URLs with scoped...

bug #41224 [HttpClient] fix adding query string to relative URLs with scoped clients (nicolas-grekas)

This PR was merged into the 4.4 branch.

Discussion
----------

[HttpClient] fix adding query string to relative URLs with scoped clients

| Q             | A
| ------------- | ---
| Branch?       | 4.4
| Bug fix?      | yes
| New feature?  | no
| Deprecations? | no
| Tickets       | Fix #41220
| License       | MIT
| Doc PR        | -

Commits
-------

5ccba2c3 [HttpClient] fix adding query string to relative URLs with scoped clients