Saturday, August 17, 2019

TIL about MS Office Protocol Discovery

I was looking at some logs, when I found some HEAD requests to an internal server, with User-Agent "Microsoft Office Excel". I was like: WTF?

Turns out, when you click on a hyperlink in a spreadsheet, Excel first sends 2/3 HEAD requests in order to... find out stuff.

Didn't know that.

What other weird, obscure protocols have you accidentally discovered?



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