etcdserver/api/rafthttp/util.go
func createPostRequest(u url.URL, path string, body io.Reader, ct string, urls types.URLs, from, cid types.ID) *http.Request {
	uu := u
	uu.Path = path
	req, err := http.NewRequest("POST", uu.String(), body)
	if err != nil {
		plog.Panicf("unexpected new request error (%v)", err)
	}
	req.Header.Set("Content-Type", ct)
	req.Header.Set("X-Server-From", from.String())
	req.Header.Set("X-Server-Version", version.Version)
	req.Header.Set("X-Min-Cluster-Version", version.MinClusterVersion)
	req.Header.Set("X-Etcd-Cluster-ID", cid.String())
	setPeerURLsHeader(req, urls)

	return req
}
func createPostRequest(u url.URL, path string, body io.Reader, ct string, urls types.URLs, from, cid types.ID) *http.Request {
	uu := u
	uu.Path = path
	req, err := http.NewRequest("POST", uu.String(), body)
	if err != nil {
		plog.Panicf("unexpected new request error (%v)", err)
	}
	req.Header.Set("Content-Type", ct)
	req.Header.Set("X-Server-From", from.String())
	req.Header.Set("X-Server-Version", version.Version)
	req.Header.Set("X-Min-Cluster-Version", version.MinClusterVersion)
	req.Header.Set("X-Etcd-Cluster-ID", cid.String())
	setPeerURLsHeader(req, urls)

	return req
}
// createPostRequest creates a HTTP POST request that sends raft message.