From an old complaint that is still plaguing us 4 years later: http://markmail.org/thread/o3iiojm427tmfssd Certain software and/or hardware probe for availability using a request like this: OPTIONS * HTTP/1.1 When mod_jk checks to see if this is a URI to handle, it complains with a WARN-level message in mod_jk.log: [Tue Dec 30 14:33:27.141 2014] [17353:140224749586432] [warn] map_uri_to_worker_ext::jk_uri_worker_map.c (1096): Uri * is invalid. Uri must start with / Since this is a) A valid URI / request b) Not one to be handled by mod_jk therefore mod_jk should not complain. As a corollary, it ought to be possible to "JkMount *" or something similar so that "OPTIONS *" requests can be forwarded to Tomcat explicitly.
The warning was toned down to a debug message in this case. Being able to forward an "OPTIONS *" would be a separate enhancement request. Not sure how to implement that (because mounts currently don't check http method). *** This bug has been marked as a duplicate of bug 50511 ***