golang proxy request incorrect

[uucckk]

when use proxy to request nginx, nginx can not be use correctly, After I rewrite some code in readRequest method then it can be succeed. The code I have already upload. So you can take a look. Waiting for your reply. Thank you

Now request.go code (from readRequest method):

req.Header = Header(mimeHeader)

	// RFC 7230, section 5.3: Must treat
	//	GET /index.html HTTP/1.1
	//	Host: www.google.com
	// and
	//	GET http://www.google.com/index.html HTTP/1.1
	//	Host: doesntmatter
	// the same. In the second case, any Host line is ignored.
	req.Host = req.URL.Host
	//if req.Host == "" {
	//	req.Host = req.Header.get("Host")
	//}
	if deleteHostHeader {
		delete(req.Header, "Host")
	}

So if I run the following code, ngxin won't report that it can't find "project error"

	remote, err := url.Parse(p.path)
			if err != nil {
				panic(err)
			}
			proxy := httputil.NewSingleHostReverseProxy(remote)
			req.URL.Path = Substring(urlPath.Path, StringLen(p.pattern), -1)


			if req.Method == "OPTIONS" {
				w.Header().Set("Access-Control-Allow-Origin", "*") //
				w.Header().Add("Access-Control-Allow-Headers", "content-type, accept, x-auth-token, X-Subject-Token,x-openstack-nova-api-version")
				w.Header().Add("Access-Control-Allow-Methods", "POST")
				w.Write([]byte("{\"test\":\"OPTIONS\"}"))
				return true
			}
			w.Header().Add("Access-Control-Allow-Origin", "*") //x-openstack-nova-api-version
			w.Header().Add("Access-Control-Allow-Headers", "content-type, accept, x-auth-token, X-Subject-Token,x-openstack-nova-api-version")
			w.Header().Add("Access-Control-Expose-Headers", "X-Subject-Token, x-openstack-nova-api-version,X-Auth-Token")
			w.Header().Add("Access-Control-Allow-Methods", "PUT,POST,GET,DELETE,OPTIONS")
			w.Header().Add("Access-Control-Allow-Credentials", "true")
			proxy.ServeHTTP(w, req)
		}

[bradfitz]

Looks like dup of #28168. Let me know if that's not correct.