How to find source code of a webpage ???

I want to know, how to find source code of a webpage which is using php 301 redirect. Because when I am trying to see the source code it is showing the source code of landing page. Is there any way to get source of that page before redirect happens.

** Earlier posted in Seo section. But didn't get a single response. So posting here.

Hello,

I found this:

Hope it helps.