diff --git a/lib/http_proxy.js b/lib/http_proxy.js
index 49b4838..45b71fb 100644
--- a/lib/http_proxy.js
+++ b/lib/http_proxy.js
@@ -1,6 +1,7 @@
 'use strict';
 
-const { URL } = require('url');
+const url = require('url');
+const { URL } = url;
 const FormStream = require('formstream');
 const ContentType = require('content-type');
 const address = require('address');
@@ -41,9 +42,10 @@ class HttpProxy {
     };
 
     if (options.withCredentials === undefined) options.withCredentials = this.config.withCredentials;
-
-    let urlObj = new URL(ctx.href);
-    urlObj.host = host;
+    let urlParsed = url.parse(ctx.href);
+    let index = ctx.href.indexOf(urlParsed.host);
+    const href = `${host}/${ctx.href.slice(index+1+urlParsed.host.length)}`;
+    let urlObj = new URL(href);
 
     if (options.rewrite) {
       urlObj = options.rewrite(urlObj);
diff --git a/package.json b/package.json
index 30bddf6..7954ce0 100644
--- a/package.json
+++ b/package.json
@@ -60,4 +60,4 @@
   "homepage": "https://github.com/eggjs/egg-http-proxy#readme",
   "author": "TZ <atian25@qq.com>",
   "license": "MIT"
-}
+}
\ No newline at end of file