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Fun protocol fact: the HTTP header which contains the referring url is called "referer" because the developer spelled "referrer" wrong and nobody noticed, so it made it into the official standards and now it's ossified.

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Really?! This closes a tremendous gap in my brain: I spent years fighting mentally every time I had to write this word in a non header context, but I was too lazy to check a dictionary. You saved a lot of my precious future time, thanks!