How to View a Page That Has a 301 Redirect

Ok so I discovered something. I do not know if this is something that people already knew, or something obvious I never learned about. Maybe this only works on the this one case with one of the clients I work with. Due to NDA I cannot disclose the web site. Basically I found a weird URL in the SERPS. It was a URL that we had 301 redirected to a better url (hyphens and kw rich). Upon closer inspection I realized that the url had two backslashes at the end of it.

I thought this was weird so I tried this technique with other pages on this domain. By simply adding to backslashes to the URL that was supposed to be 301 redirected I got to see the page without going to the new URL. I even used the Server Header tool and my findings were confirmed with a 200OK.

Just so you know I tried this with another client we used 301 redirects with that had super dynamic URLs before hiring me. Unfortunately, the double backslah technique did not work with Dynamic URLs.

Let me know if anyone else has seen something similar?