refactor error_500

[codecov[bot]]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (b785930) 92.64% compared to head (1316b92) 92.54%.

:exclamation: Current head 1316b92 differs from pull request most recent head 6085748. Consider uploading reports for the commit 6085748 to get more accurate results

Files	Patch %	Lines
tremolo/lib/http_protocol.py	66.66%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #47 +/- ## ========================================== - Coverage 92.64% 92.54% -0.11% ========================================== Files 19 19 Lines 1849 1851 +2 ========================================== Hits 1713 1713 - Misses 136 138 +2 ```

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[sonarcloud[bot]]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

90.9% Coverage
0.0% Duplication