The Rails app that I was working on a couple weeks ago for work is finally complete and in the hands of users. A couple higher-priority tasks kept me from getting back to it until yesterday, and the final push towards release was fantastically ugly.
For legacy reasons, I need two of my app’s controllers to use HTTP basic authentication, not form-based authentication. HTTP authentication with Rails isn’t well documented, but the “teenage mutant ninja hero coders” have an example that works just fine with webrick. Unfortunately, it completely fails with Apache for reasons that weren’t particularly clear. It’s fairly well-known that Apache blocks CGIs from seeing HTTP authentication headers, but none of the workarounds that should have worked with Apache 1.3 (mod_rewrite, fastcgi, etc) actually worked.
In the end, I ended up upgrading to Apache 2 with FastCGI, and it worked flawlessly. Er, except the CGI variable that I was looking for went from being called
Authorization, so I had to tweak
application.rb a bit.