diff --git a/web-server/app/middleware/proxy.ts b/web-server/app/middleware/proxy.ts
index 581749f89..87d112b5f 100644
--- a/web-server/app/middleware/proxy.ts
+++ b/web-server/app/middleware/proxy.ts
@@ -13,14 +13,7 @@ module.exports = () => {
             ctx.app.config.envToHost = envToHost;
         }
         if(!ctx.app.config.sidToHost) {
-            let envToHost = ctx.app.config.envToHost||new Map();
-            let sidToHost = new Map<string, string>();
-            let servers = await ServerlistModel.getAllServerList();
-            for(let { id, env } of servers) {
-                let webHost = envToHost.get(env);
-                sidToHost.set(id.toString(), webHost);   
-            }
-            ctx.app.config.sidToHost = sidToHost;
+            await getNewHost(ctx);
         }
 
         let options = {};
@@ -39,11 +32,16 @@ module.exports = () => {
             let url = getProxyUrl(ctx.request.url);
             if(url) {
                 let sid = ctx.request.method == 'GET'? ctx.query.sid.toString(): ctx.request.body.sid.toString();
-                options[url] = {
-                    target: ctx.app.config.sidToHost.get(sid),
-                    changeOrigin: true,
-                    secure: true,
-                    headers: { "is-proxy": "true" }
+                if(!ctx.app.config.sidToHost) {
+                    await getNewHost(sid);
+                }
+                if(!!ctx.app.config.sidToHost.get(sid)) {
+                    options[url] = {
+                        target: ctx.app.config.sidToHost.get(sid),
+                        changeOrigin: true,
+                        secure: true,
+                        headers: { "is-proxy": "true" }
+                    }
                 }
             }
         }
@@ -52,6 +50,17 @@ module.exports = () => {
     };
   };
 
+  async function getNewHost(ctx) {
+    let envToHost = ctx.app.config.envToHost||new Map();
+    let sidToHost = new Map<string, string>();
+    let servers = await ServerlistModel.getAllServerList();
+    for(let { id, env } of servers) {
+        let webHost = envToHost.get(env);
+        sidToHost.set(id.toString(), webHost);   
+    }
+    ctx.app.config.sidToHost = sidToHost;
+  }
+
   function getProxyUrl(url: string) {
     const urls = [
         '/cb/treatusername',