optimize: allow http head when use getonly

[li-jin-gou]

pr for #1455

[erikdubbelboer]

I guess it makes sense. But please also change the documentation here to reflect this:

fasthttp/server.go

Lines 292 to 299 in 2a572e0

	// Rejects all non-GET requests if set to true.
	//
	// This option is useful as anti-DoS protection for servers
	// accepting only GET requests. The request size is limited
	// by ReadBufferSize if GetOnly is set.
	//
	// Server accepts all the requests by default.
	GetOnly bool

[li-jin-gou]

I guess it makes sense. But please also change the documentation here to reflect this:

fasthttp/server.go

Lines 292 to 299 in 2a572e0

	// Rejects all non-GET requests if set to true.
	//
	// This option is useful as anti-DoS protection for servers
	// accepting only GET requests. The request size is limited
	// by ReadBufferSize if GetOnly is set.
	//
	// Server accepts all the requests by default.
	GetOnly bool

thanks and done

[erikdubbelboer]

Thanks!

[TheKigen]

Thank you.