A password works by there is a piece of text that only you know, and thus, when you give that password to a server, that server knows who you are. can't you al

A password works by there is a piece of text that only you know, and thus, when you give that password to a server, that server knows who you are. can't you also view a url as a password? (If only I know the url, then only I can download the file). I am able to give out a url to someone else, so they can access the file, likewise, I can give out my file server's username and password, and whoever has it can also access my files.