Don't catch SystemExit in catch-all exceptions.
Don't catch SystemExit in catch-all exceptions.

exit_error raises SystemExit. This was causing the exception handler for
exit_error(400) to print another "Status: 500" in the response body.

infinity0/flashproxy,arlolra/flashproxy,glamrock/flashproxy,glamrock/flashproxy,infinity0/flashproxy,glamrock/flashproxy,glamrock/flashproxy,infinity0/flashproxy,arlolra/flashproxy,arlolra/flashproxy,arlolra/flashproxy,glamrock/flashproxy,glamrock/flashproxy,infinity0/flashproxy,infinity0/flashproxy,arlolra/flashproxy,infinity0/flashproxy,arlolra/flashproxy,arlolra/flashproxy