feat(quark): add preset range header (close #4166)

server/common/proxy.go

@@ -77,12 +77,18 @@ func Proxy(w http.ResponseWriter, r *http.Request, link *model.Link, file model.
 		if err != nil {
 			return err
 		}
+		// preset header
+		for h, val := range link.PresetHeader {
+			req.Header[h] = val
+		}
+		// client header
 		for h, val := range r.Header {
 			if utils.SliceContains(conf.SlicesMap[conf.ProxyIgnoreHeaders], strings.ToLower(h)) {
 				continue
 			}
 			req.Header[h] = val
 		}
+		// needed header
 		for h, val := range link.Header {
 			req.Header[h] = val
 		}