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2ebac52d2d
If an endpoint handler throws an exception, the details of the exception
are not returned to the client. Normally this is desirable so that
information is not leaked, but in this test framework we do want to
return the details to the client so it can log a useful error message.
Do it by wrapping every handler into a catch clause that returns
the exception message.
Also modify a bit how HTTPErrors are rendered so it's easier to discern
the actual body of the error from other details (such as the params used
to make the request etc.)
Before:
```
E test.pylib.rest_client.HTTPError: HTTP error 500: 500 Internal Server Error
E
E Server got itself in trouble, params None, json None, uri http+unix://api/cluster/before-test/test_stuff
```
After:
```
E test.pylib.rest_client.HTTPError: HTTP error 500, uri: http+unix://api/cluster/before-test/test_stuff, params: None, json: None, body:
E Failed to start server at host 127.155.129.1.
E Check the log files:
E /home/kbraun/dev/scylladb/testlog/test.py.dev.log
E /home/kbraun/dev/scylladb/testlog/dev/scylla-1.log
```
Closes #12563
(cherry picked from commit 2f84e820fd)