What's the meaning of req.http.Expect?

[Poul-Henning Kamp]

In message <BLU116-W270839BDEE99BC1BB0D98D854A0 at phx.gbl>, MontyRee writes:

>I can see req.http.Expect like below from the lots of vcl example.
>  if (req.http.Expect) {                  pipe;              }
>Then, what's the meaning of the req.http.Expect?

The test above is "If the request has a "Expect:" HTTP header"

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