fix(striker-ui-api): enhance VNC proxy error messages

striker-ui-api/src/lib/accessModule.ts

@@ -492,7 +492,15 @@ const getVncinfo = async (serverUuid: string): Promise<ServerDetailVncInfo> => {
   const port = Number(rPort);
   const protocol = 'ws';
 
-  return { domain, port, protocol };
+  const result: ServerDetailVncInfo = {
+    domain,
+    port,
+    protocol,
+  };
+
+  shvar(result, `VNC info for server [${serverUuid}]: `);
+
+  return result;
 };
 
 export {

striker-ui-api/src/middlewares/proxyServerVnc.ts

@@ -1,4 +1,3 @@
-import { ServerResponse } from 'http';
 import { createProxyMiddleware } from 'http-proxy-middleware';
 
 import { P_UUID } from '../lib/consts';
@@ -37,9 +36,19 @@ export const proxyServerVnc = createProxyMiddleware({
   },
   on: {
     error: (error, request, response) => {
-      stderr(String(error));
+      stderr(`VNC proxy error: ${error}`);
 
-      (response as ServerResponse).writeHead(404).end();
+      let resType: string;
+
+      if ('writeHead' in response) {
+        resType = 'ServerResponse';
+
+        response.writeHead(500).end();
+      } else {
+        resType = 'Socket';
+      }
+
+      stdout(`Response type = ${resType}`);
     },
   },
   ws: true,