Viewing svn diff in apache

So I just learned that you can view old revisions by adding the "p" parameter as such:

http://svn.example.com/repo/?p=123

Is it possible to have it display the difference between two revisions? (Similar to svn diff in command line)

The "p" (peg revision) and "r" (operative revision) are described here:

• http://svnbook.red-bean.com/en/1.7/svn.serverconfig.httpd.html#svn.serverconfig.httpd.extra.other

• http://svnbook.red-bean.com/en/1.7/svn.advanced.pegrevs.html

But you can only browse versions - you cannot see "diff's" without additional packages. One good choice is WebSVN:

• http://www.websvn.info/

Check this link for more options:

• What is the best web based Subversion client?