customizable exception page with @app.error(500)

[nggit]

Example:

@app.error(500)
async def exception_handler(**server):
    exc = server['exc']

    return str(exc)

[codecov]

Codecov Report

Attention: 34 lines in your changes are missing coverage. Please review.

Comparison is base (8a4cd41) 91.27% compared to head (170215e) 92.39%.
Report is 9 commits behind head on master.

❗ Current head 170215e differs from pull request most recent head 833e8a8. Consider uploading reports for the commit 833e8a8 to get more accurate results

Files	Patch %	Lines
tremolo/tremolo.py	83.06%	21 Missing ⚠️
tremolo/lib/http_protocol.py	90.14%	7 Missing ⚠️
tremolo/lib/http_response.py	92.85%	3 Missing ⚠️
tremolo/asgi_lifespan.py	88.23%	2 Missing ⚠️
tremolo/lib/tasks.py	75.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #32      +/-   ##
==========================================
+ Coverage   91.27%   92.39%   +1.11%     
==========================================
  Files          19       19              
  Lines        1720     1854     +134     
==========================================
+ Hits         1570     1713     +143     
+ Misses        150      141       -9     

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