default http headers generated by php curl

We know that we can customize http headers for php curl using CURLOPT_HTTPHEADER. But if we do not add additional headers, what http headers does curl send by default? In fact, the default http request is very simple: 3 lines with 2 headers:

GET / HTTP/1.1
Accept: */*

No extra http headers.

Note that this is not the minimum set of required(necessary) http headers since “Accept: */*” is not necessary as per http specification.



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