Jenkins has a number of special URLs... the ones for controlling jobs are lightly documented, but while many of the "special ones" appear in various articles, I have never seen them documented in one place.
The ones I know of are:
http://jenkins:8080/restart
http://jenkins:8080/safeRestart
http://jenkins:8080/quietDown
http://jenkins:8080/cancelQuietDown
Failing that, what other special Jenkins URLs to you know about and use?