sync merge (add request headers for static files) to dev

README.md

@@ -229,7 +229,7 @@ When listen=true in config.json :
 > https://`your_primary_node_domain_name:9443`/janusec-admin/  (after certificate configured)  
 
 When using primary node only, any application domain name can be used for admin.   
-But if you have one or more replica nodes, you should apply for a seperate domain name for primary node.   
+But if you have one or more replica nodes, you should apply for a separate domain name for primary node.   
 
 [Janusec Application Gateway Configuration](https://janusec.github.io/documentation/quick-start/)   
 

gateway/gateway.go

@@ -469,6 +469,10 @@ func ReverseHandlerFunc(w http.ResponseWriter, r *http.Request) {
 							utils.DebugPrintln("Check Update NewRequest", err)
 						}
 						if err == nil {
+							// copy request headers
+							for k := range r.Header {
+								req.Header.Set(k, r.Header.Get(k))
+							}
 							req.Header.Set("Host", domainStr)
 							modTimeGMT := fi.ModTime().UTC().Format(http.TimeFormat)
 							//If-Modified-Since: Sun, 14 Jun 2020 13:54:20 GMT