detect error codes

[flyingsheep]

i am trying to make a program which would recieve a website as a parameter or read one from a line in a text file, attempt to access that site, and if it recieves an error, deletes that site from the list, or returns an error a little like a proxy checker, how can i detect if it gets, for example, a 401 error?.
thanks in advance
alex

 

[flyingsheep]

nvm i got it, thanks anyways