jenkinsci/jenkins — comment on commit c51114a1970738dcc7d178c486fda03a7ada8755
File: core/src/main/java/hudson/Functions.java line 1207
By ohtake:

`getContextPath()` will return "" if Jenkins is served at ROOT.

Assume that getContextPath() => "", itUrl => "iturl" and urlName => "urlName",
value returned was "/iturl/urlName", but is "iturl/urlName" (no slash at 0).