[HADOOP-13588] ConfServlet should respect Accept request header

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 2.9.0, 3.0.0-alpha2, 2.8.3
• Component/s: conf
• Hadoop Flags: Incompatible change, Reviewed
• Release Note: Conf HTTP service should set response's content type according to the Accept header in the request.
• Assignee: Weiwei Yang
• Reporter: Weiwei Yang
• Created: 08/Sep/16 15:15
• Updated: 11/Aug/17 18:15
• Resolved: 12/Sep/16 23:23

Description

ConfServlet provides a general service to retrieve daemon configurations. However it doesn't set response content-type according to Accept header. For example, by issuing following command,

curl --header "Accept:application/json" http://${resourcemanager_host}:8088/conf

I am expecting the response would be in JSON format, however it is still in XML. I can only get JSON if I issue

curl http://${resourcemanager_host}:8088/conf?format="json"

This is not the common way how clients set content-type.