Issue
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We are unable to see a component in Jenkins. When we check the log, we see an error of "traits.js" failing to be retrieved, making a 403 forbidden in the console.
Resolution
Check if CloudBees Request Filter is enabled and see the regular expressions attached to it.
The following one causes the crash:
./api/\w+(?!.+tree=.+).
1.- Go to Manage Jenkins > System Configuration
2.- Scroll down to Request Filtering
3.- Check if the rule is: ./api/\w+(?!.+tree=.+). If it is, it is likely filtering the api/ URLS, thus, failing to retrieve the traits.js what causes the 403 error and prevents you to see components, such as dropdowns.
4.- Delete it, or change the regular expression to one that allows the API to pass and blocks the desired ones.
If the problem persists, please open a support ticket including a Support Bundle, including all the Configuration options, such a Jenkins Root Configuration
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