System error log "Requested URI does not represent any resource: /now/ui/user/user_name/" after upgrade to Paris - Known Error

System error log "Requested URI does not represent any resource: /now/ui/user/user_name/" after upgrade to Paris Description System log shows the below exceptions "Error Requested URI does not represent any resource: /now/ui/user/user_name/ : no thrown error com.glide.ui.ServletErrorListener"

From transaction log, we could see the "created by" user is in the format domain/username.These transactions are not triggered by any third party and are related to the user service transactions on the instance

Backward slash in user id is causing the issue as this backslash is converted to forward slash in the browser and causing issues with /now/ui/user/user_nameAPI processing

Node logs says the exception is coming from default thread and don't see any external calls from third party. Affected REST API is /now/ui/user/user_name and it doesn't support user_name values with slashes.

Sample user_name with a backslash - servicenow\bill. When transactions are executed with respect to user service ,the browser is converting backward slash to a forward slash during execution causing the above problem

Steps to Reproduce

Any transactions related to the API /now/ui/user/user_name/ where user_id is in the format domain\name and does the transactions related to user service

Workaround Make sure the users doesn't have the domain\user as the user id in the sys_user table. Avoid the slash in the user id.