go install github.com/michael1026/log4jcheck@latest
cat URLs | log4jcheck -user-agent -referer -server example.burpcollaborator.net
-struts will change the path and append the payload from this post: https://twitter.com/testanull/status/1469549425521348609
I would not use this flag for basic checks.
I also recommend using -user-agent and -referer seperately as one header sometimes causes 400 Bad Requests, invalidating your tests.