When looking at all HTTP headers, after so many years of probably doing the same, I realized that Referrer was misspelled. This wikipedia entry has some details on why, mostly attributable to the fact that ispell (?) did not recognize either word at the time.
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[ 2.8 ms ] story [ 14.9 ms ] threadAnyway, it's a fun fact of computer history :)
Relevant RFC: https://tools.ietf.org/html/rfc1945#section-10.13
Edit: added source RFC.