Copy-pasted from my google group post at https://groups.google.com/forum/#!topic/reviewboard/pwAGQMEcE54.
The Issue
Relative links are generated from emails sent due to uploaded images on a review.
Environment
Reviewboard Version: 2.0.18
OS: RHEL6
Python: 2.6
To Reproduce:
1. Install reviewboard 2.0.18 (we use apache to serve it via wsgidaemonprocess with 15 threads and 3 workers)
2. configure it with authentication (we use a custom sso backend) and with an email server (we have send emails for review requests, send emails when review request are closed, enable auto-submitted header, sender email address, mail server, and port filled out, but nothing else)
3. sign up/log in as a normal user and make sure your account is set with a valid email address
4. create a review request
a) uploading a diff (we used a perforce diff and a perforce repo, along with a pending change number)
b) you will need to fill out summary and description (eg: the word "test" in each)
c) add yourself as a reviewer (under "people")
d) click "publish"
5. attach an image
a) go to "update" on the review request and click "add file"
b) select an image (I chose a 9.13KB PNG file which I have attached)
c) select "open" and then accept the image without a caption
d) click "publish" without any further changes
e) you should have received at least 2 emails at this point
6. review the immage
a) on "review request changed (added files)" click "review"
b) select a block of the image and type the word "banned" in the dialog
c) save the comment and publish the review
d) see that the email which is generated contains a relative link to the email
eg: <img class="modified-image" src="/media/uploaded/files/2015/08/13/a23a56b2-7413-4579-b0f2-f9f290c7a492__BANHAMMER_2_3_132_123.png" width="132" height="123" alt="banned">