Interactive Problems

I'm pretty new to HTTP in general. I found this site that lets you test HTTP based code:

http://httpbin.org/

When running code for Problem 176 Say 100, This site does return a response to me. But when I try the codeabbey site I just get back a lot of error messages. I'm curious if anyone who has solved this problem could try it again and see if it still works?

I'm not sure if there is a problem with the codeabbey site, or my code is just not right.

Thanks for the time.