fix: 修复 header origin 为空时报错的问题

README.md

@@ -22,7 +22,7 @@ npm add @lzwme/captcha-cv-ocr
 因为所需的 OpenCV 支持模块 [@u4/opencv4nodejs](https://github.com/UrielCh/opencv4nodejs) 体积较大，编译过程复杂，请手动安装，或者参考官方的安装指南：
 
 ```bash
-npm i @u4/opencv4nodejs -g
+npm i @u4/opencv4nodejs
 ```
 
 ### 用法

lib/createServer.js

@@ -18,7 +18,7 @@ async function createServer({ port, baseDir = process.cwd() } = {}) {
 
   const clientServer = http.createServer(async (req, res) => {
     const corsHeaders = {
-      'Access-Control-Allow-Origin': req.headers.origin,
+      'Access-Control-Allow-Origin': req.headers.origin || '*',
       'Content-Type': 'application/json',
       'Access-Control-Allow-Headers': 'Content-Type,Content-Length,Authorization,Accept,X-Requested-With',
     };
@@ -97,4 +97,3 @@ async function createServer({ port, baseDir = process.cwd() } = {}) {
 }
 
 exports.createServer = createServer;
-

package.json

@@ -41,7 +41,5 @@
   "optionalDependencies": {
     "@img/sharp-win32-x64": "^0.33.1"
   },
-  "peerDependencies": {
-    "@u4/opencv4nodejs": ">=6.5.0"
-  }
+  "peerDependencies": {}
 }