fix request handling after closing the proxy

[codecov[bot]]

Codecov Report

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

Project coverage is 74.75%. Comparing base (0916585) to head (2e37bbf).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #61 +/- ## ========================================== + Coverage 72.02% 74.75% +2.73% ========================================== Files 4 4 Lines 311 309 -2 ========================================== + Hits 224 231 +7 + Misses 60 54 -6 + Partials 27 24 -3 ```

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