feat: add withConfig for customizable HTTP configuration and fix config only setup

[drdreo]

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines: CONTRIBUTING.md#commit
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

[x] Bugfix
[x] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Build related changes
[ ] CI related changes
[ ] Documentation content changes
[ ] Other... Please describe:

What is the current behavior?

Issue Number: 110

What is the new behavior?

Allows to provide custom config via withConfig(config), fixes config only setups and adds unit tests.

Does this PR introduce a breaking change?

[ ] Yes
[x] No

Other information

Bumped version to 5.2.0

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