[keep-web] logging doesn't include error messages
Community user on gitter is attempting to set up keep-web. It was first returning a 400 status code (which we determined could be worked around by setting
TrustAllContent: true but there is no indication about why it was failing). After that it returned a 500 status code (still haven't figured it out). Keep-web needs to log error messages make it possible to diagnose failures.
Updated a few error messages, including the "400 can't serve inline content because XSS" error, which was sending no text at all, and was almost certainly the one that motivated this issue.
15606-keep-web-errors @ fb3568c55a9f64a6027fcfe78ca21a79461ea348 -- https://ci.curoverse.com/view/Developer/job/developer-run-tests/1614/