Needs trailing '/' to avoid redirect

This is from IRC conversation:

(12:05:05 PM) electrical: I've installed the https://wiki.jenkins-ci.org/display/JENKINS/GitHub+pull+request+builder+plugin plugin and configured it ( in global settings and the job settings ) but its not detecting any new PR's or changes.
(12:05:22 PM) electrical: i dont see any polling in the jenkins log either.
(12:05:29 PM) kohsuke: electrical: did it put hooks into your repos?
(12:05:41 PM) electrical: also configured it to use the webhook. but returns with a 302 response it seems
(12:06:18 PM) kohsuke: oh and I guess GitHub doesn't follow the redirects, hence the problem?
(12:08:08 PM) electrical: kohsuke: ah, that could be a reason yeah.
(12:08:44 PM) kohsuke: Some pieces do already exist (like testing an already running instance of Jenkins), I have a few suspected ideas on my own (filter tests by plugins and things it touch)
(12:08:57 PM) kohsuke: but I wanted to hear from you
(12:09:24 PM) kohsuke: electrical: which URL is GitHub hitting and do you know why it responds with 302?
(12:09:55 PM) electrical: kohsuke: its hitting http://my.jenkins.server.com/ghprbhook
(12:10:23 PM) errant_Stalin: kohsuke: trying to get swarm running an getting this:  http://pastie.org/8989430
(12:10:35 PM) electrical: no idea why its doing a 302 because im also using the github plugin in jenkins and that one is working great
(12:10:59 PM) kohsuke: electrical: it looks like it should be hitting http://my.jenkins.server.com/ghprbhook/
(12:11:02 PM) kohsuke: the '/' is crucial
(12:11:28 PM) electrical: kohsuke: will try that.
(12:13:48 PM) kohsuke: electrical: in this plugin are you supposed to install hooks by yourself?
(12:13:52 PM) kohsuke: Or does the plugin do that for you?
(12:14:14 PM) electrical: kohsuke: the plugin did it for me. but seems it did it wrong then.. with the / at the end i get a 200 back now
(12:14:22 PM) kohsuke: great
(12:14:32 PM) kohsuke: all right let me fix the README.md