test: avoid require in HTTP request handlers

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 88.49%. Comparing base (6413a43) to head (3aff350).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #758 +/- ## ======================================= Coverage 88.49% 88.49% ======================================= Files 48 48 Lines 1990 1990 ======================================= Hits 1761 1761 Misses 208 208 Partials 21 21 ``` | [Flag](https://app.codecov.io/gh/favonia/cloudflare-ddns/pull/758/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=favonia) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/favonia/cloudflare-ddns/pull/758/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=favonia) | `88.49% <ø> (ø)` | | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=favonia#carryforward-flags-in-the-pull-request-comment) to find out more.

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