Hi all,
I found a something wierd after i migrate my JIRA. When i add a user to a project, the error alerts once i input some key in the text area. I look into the browser console, and the error message is like:

Meanwhile, i inspect in via fiddler, it shows 504 error code:

At first, i suspect that it's due to the large length of GET query parameter, which is about less than 3000 bytes. But after i test it using another JIRA instance with the same length query GET request, it is OK.
Then, i switch on the gzip compress option in JIRA, and found it still doesn't work.