With change from log_info to log_message I'm still getting a broken pipe error, but it no longer seems to block me from logging in.

# pointed browser at the port
127.0.0.1 - - [22/May/2026 11:46:30] "GET / HTTP/1.1" 302 -
127.0.0.1 - - [22/May/2026 18:46:30] "GET /demo/index HTTP/1.1" 200 -
127.0.0.1 - - [22/May/2026 18:46:32] "GET /demo/@@file/style.css HTTP/1.1" 200 -
127.0.0.1 - - [22/May/2026 18:46:32] "GET /demo/@@file/datecopy.min.js HTTP/1.1" 200 -
127.0.0.1 - - [22/May/2026 18:46:32] "GET /demo/rest HTTP/1.1" 403 -
127.0.0.1 - - [22/May/2026 18:46:32] "GET /favicon.ico HTTP/1.1" 200 -
# and here's the Broken pipe, as reported by the new error handler
127.0.0.1 - - [22/May/2026 18:46:32] Client has gone: [Errno 32] Broken pipe

# wait and do nothing, then login to demo in the browser
127.0.0.1 - - [22/May/2026 18:47:11] "POST /demo/ HTTP/1.1" 302 -
127.0.0.1 - - [22/May/2026 18:47:11] "GET /demo/index?%40ok_message=Welcome+demo%21 HTTP/1.1" 200 -
127.0.0.1 - - [22/May/2026 18:47:12] "GET /demo/rest HTTP/1.1" 200 -
127.0.0.1 - - [22/May/2026 18:47:12] "GET /demo/?%40template=translation&properties=apply%2Ccancel%2Cnext%2Cprev%2Csearch%2Creset%2CInfo+on+%7BclassName%7D+-+%7BitemDesignator%7D+-+Classhelper HTTP/1.1" 200 -

127.0.0.1 - - [22/May/2026 18:47:40] "GET /demo/issue?@template=item HTTP/1.1" 200 -
127.0.0.1 - - [22/May/2026 18:47:40] "GET /demo/rest HTTP/1.1" 200 -
127.0.0.1 - - [22/May/2026 18:47:40] "GET /demo/rest/data/status?@verbose=2 HTTP/1.1" 200 -
127.0.0.1 - - [22/May/2026 18:47:40] "GET /demo/?%40template=translation&properties=title%2Cstatus%2Ckeyword%2Cid%2Cusername%2Crealname%2Cphone%2Caddress%2Cname%2Capply%2Ccancel%2Cnext%2Cprev%2Csearch%2Creset%2CInfo+on+%7BclassName%7D+-+%7BitemDesignator%7D+-+Classhelper HTTP/1.1" 200 -
127.0.0.1 - - [22/May/2026 18:47:40] "GET /demo/rest/data/keyword?@verbose=2 HTTP/1.1" 200 -
# during this time I fiddled with the FF web tools, but did not interact with the page
127.0.0.1 - - [22/May/2026 18:48:40] Request timed out: timeout('timed out')
127.0.0.1 - - [22/May/2026 18:48:40] Request timed out: timeout('timed out')

More later.