diff --git a/lib/index.js b/lib/index.js
index b742374..caae005 100644
--- a/lib/index.js
+++ b/lib/index.js
@@ -44,6 +44,7 @@ class Router {
     const space = req.headers[SPACE_NAME];
     const group = req.headers[GROUP_NAME];
     const name = req.headers[ENV_NAME];
+    const envName = req.headers[ENV_HEAD];
     const workers = await this.getWorkers();
     if (!workers.totalLen || req.socket.destroyed) {
       destroy(req);
@@ -57,12 +58,12 @@ class Router {
       }
       const servers = workers._servers;
       const i = index++ % servers.totalLen;
-      headers[ENV_HEAD] = `${i}`;
+      headers[ENV_HEAD] = envName || `${i}`;
       return proxyToNohost(servers[i], req, res);
     }
 
     const hash = parseInt(crc32(`${space}/${group}/${name || ''}`), 16) % workers.totalLen;
-    const env = `$${hash}`;
+    const env = envName || `$${hash}`;
     headers[ENV_HEAD] = env;
     if (req.isUIRequest) {
       headers['x-whistle-nohost-ui'] = 1;
@@ -86,6 +87,7 @@ class Router {
 Router.SPACE_NAME = SPACE_NAME;
 Router.GROUP_NAME = GROUP_NAME;
 Router.ENV_NAME = ENV_NAME;
+Router.ENV_HEAD = ENV_HEAD;
 Router.NOHOST_RULE = 'x-whistle-nohost-rule';
 Router.NOHOST_VALUE = 'x-whistle-nohost-value';
 Router.CLIENT_ID = 'x-whistle-client-id';