If you read a little further on the page I linked to, you would have noticed that you can obtain the source from a local mirror..
The source is not installed into /usr/src by default, but it is distributed on both release CD-ROM's and the FTP/HTTP mirrors.. in your case...
src.tar.gz is what you're looking for.
Also, that errata patch is only relevant on 64-bit architectures... as mentioned clearly on the 4.4 errata page.
Quote:
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Originally Posted by http://www.openbsd.org/errata44.html#004_httpd
Fix httpd(8)'s mod_proxy module which is broken on 64-bit architectures. Due to the bug this will result in child processes crashing when utilizing proxy rules during an HTTP session.
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I gave a short list of other possible causes above.. there is nothing we can do without a little more information from you.