overcome CORS

api/srv.consult.js

@@ -7,7 +7,6 @@ let TEMPLATE_FILE_NAME = "%DIR%/consult_%UUID%";
 let URL_CONSULT = "/api/consult";
 
 let srv = http.createServer((req, res) => {
-    // POST
     if (req.method == "POST") {
         var dat = "";
         req.on("data", (chunk) => {
@@ -22,6 +21,8 @@ let srv = http.createServer((req, res) => {
                 returnError(res);
             }
         });
+    } else if (req.method == "OPTIONS") {
+        returnNoCORS(res);
     } else {
         returnError(res);
     }
@@ -58,6 +59,19 @@ function returnError(res) {
 </html>`);
 }
 
+function returnNoCORS(res) {
+    res.writeHead(
+        204,
+        {
+            "Access-Control-Allow-Headers": "Content-Type",
+            "Access-Control-Allow-Origin": "*",
+            "Content-Length": "0",
+            "Content-Type": "text/plain;charset=UTF-8",
+        }
+    );
+    res.end();
+}
+
 function returnSuccess(res) {
     res.writeHead(200, { "Content-Type": "application/json;charset=UTF-8" });
     let dat = { code: 4 };

nginx/cfg

@@ -34,7 +34,7 @@ server {
     if ($request_method = "OPTIONS") {
       add_header "Access-Control-Allow-Origin" "*";
       add_header "Access-Control-Allow-Headers" "Content-Type";
-      add_header "Content-Type" "text/plain charset=UTF-8";
+      add_header "Content-Type" "text/plain;charset=UTF-8";
       add_header "Content-Length" 0;
       return 204;
     }