There are numerous options for what to do when an error occurs while processing a hunchentoot request. But unless I'm missing something, there's no option to (effectively) call invoke-debugger? While developing and debugging, I find this to seeing a log message etc.
It's rather easy to modify the standard process-request to call invoke-debugger, but wouldn't it make sense to have something like hunchentoot:*invoke-debugger-on-error-p* ?