How to find if a URL redirects

[theorymaster]

Hello seniors,

I am trying to build a web spider to classify spam. My question is how
to find if a URL uses redirection (either JavaScript based or 301-307
redirects). Any guidance would be greatly appreciated.

Thanks!
Anirudh Koul

[tscott]

Hey,
I looked around a bit, Couldn't really find any way. Especially for PHP redirects.
I thought of something but it probelly won't work. Recording the current location then setting a timer and then checking it again and recording the second URL. I doubt this would work though unless of course it was on your own server. My best advice would be to browse around php.net. See if you can find anything, Maybe look a little at CURL functions.
~Tyler