If I visit a website and get a 404 error, I'll assume that the website is down or my URL is incorrect. If I get a 451 error, I'll know it's censorship and can

If I visit a website and get a 404 error, I'll assume that the website is down or my URL is incorrect. If I get a 451 error, I'll know it's censorship and can use something like Tor to get around it. Actually, I'm sure there will be some browser extensions soon to automatically use a proxy if a 451 error is returned.