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Regarding the conflict detection,the conflict changes and account info should be displayed instead of the following error: Internal Server Error The server encountered an internal error or misconfiguration and was unable to complete your request. Please contact the server administrator, sysadmin-engops and inform them of the time the error occurred, and anything you might have done that may have caused the error. More information about this error may be available in the server error log.
This is caused by no http header as there some code mistakes, I have fixed it.