I ran into an interesting issue after testing CBWire 4 on a lucee server behind IIS and using the BonCode AJP Connector. It took me a few minutes to track it down and I figured I would post what I found here in the event anyone else has a similar issue.
The initial render of the wire on the page was working fine however on any livewire requests the /cbwire/update endpoint was getting a 400 Bad Request. Interestingly however was that the request was being captured in cbdebugger as well as the 400 response.
After a few minutes of troubleshooting I realized that the /BIN/BonCodeAJP13.settings file included <AllowEmptyHeaders>False</AllowEmptyHeaders> and livewire sends an empty X-Livewire: header. The BonCode connector was removing that header and causing the application to return 400 Bad Request.
After changing it to <AllowEmptyHeaders>True</AllowEmptyHeaders> it worked as expected.
Just thought I would share for anyone else that may run into the issue as well and hopefully might help them!