[go-nuts] Why delete the req.Header["Host"] value in http.Request?

On Thu, Oct 3, 2013 at 2:57 PM, Jim Robinson wrote:

Hi folks,

In http://golang.org/src/pkg/net/http/request.go#L560
there is code that is dealing with the possibility of an
incoming 'standard' HTTP request (path only) or an
incoming proxy request (with a full URL specified).

I'm not understanding why the code then deletes the
Host record from req.Header map. Could someone
explain the reason for that operation on line 571?

560 // RFC2616: Must treat 561 // GET /index.html HTTP/1.1 562 // Host: www.google.com 563 // and 564 // GET http://www.google.com/index.html HTTP/1.1 565 // Host: doesntmatter 566 // the same. In the second case, any Host line is ignored. 567 req.Host = req.URL.Host 568 if req.Host == "" { 569 req.Host = req.Header.get("Host") 570 } 571 delete(req.Header, "Host")

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