we shouldn't change the definition of it.

Instead, I'm creating a new tag.

... to fix a possible race condition.

[JENKINS-13536] I think the proper thing to do is to use the Accept header, not the Content-Type header.

When a client uses the buildWithParameters API and request a json output, return the job definition as a json string instead of doing a redirect on the job page.

Changed from
  "This node is back online"
to
  "Bring this node back online"

Conflicts:

	changelog.html

This reverts commit 9a1ad74b. The bits
aren't yet synchronized to central apparently.

Conflicts:

	changelog.html

This is also related to [JENKINS-9778].

[FIXED JENKINS-8214] Added a DISCOVER permission to allow anonymous users to be presented the login screen when accessing job URLs

[FIXED JENKINS-13564] If there is any problem when searching for user partipication in the build, end up more gracefully.

if the root URL isn't configured, clients won't be able to find this, so might as well not advertise at all.