I run Wildfly (try 11 and 12 version) and deploy war in Intellij IDEA. After first request to browser server break down with exception (and exeption repeat and repeat until i stop it) -
ERROR [io.undertow.request] (default task-4) UT005023: Exception handling request to /: java.lang.IllegalArgumentException: UT000173: An invalid control character  was present in the cookie value or attribute
I tried clear cookies in browser (in my case i tried and chrome and opera) it didn't help.
My friends work with the same code and same server and everithing OK, It occures just on my computer. (windows 7)
I have no idea what i suppose to do!!!!
Are you using Cyrillic characters in your URL or page? If yes, this problem could be related to code conversion as described here https://support.microsoft.com/en-us/help/925261/the-turn-off-sending-urls-as-utf-8-policy-setting-for-internet-explore