我目前用的版本：Umi-OCR_Paddle_dev_20231105

说下我这边的复现步骤：

1、本地创建test.html文件，内容如下，然后直接用浏览器打开，F12打开控制台提示报错Access to fetch at 'http://127.0.0.1:1224/api/ocr' from origin 'null' has been blocked by CORS policy: Response to preflight request doesn't pass access control check: No 'Access-Control-Allow-Origin' header is present on the requested resource. If an opaque response serves your needs, set the request's mode to 'no-cors' to fetch the resource with CORS disabled.

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>test</title>
</head>

<body>
    <script>
        const url = 'http://127.0.0.1:1224/api/ocr';
        const data = {
            base64: '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',
            // Paddle引擎插件格式
            options: {
                cls: false,
                language: "models/config_chinese.txt",
                limit_side_len: 960
            }
            // Rapid引擎插件格式
            // options: {
            //     angle: false,
            //     language: "简体中文(V4)",
            //     maxSideLen: 1024
            // }
        };

        fetch(url, {
                method: 'POST',
                headers: {
                    'Content-Type': 'application/json'
                },
                body: JSON.stringify(data),

            })
            .then(response => response.json())
            .then(data => {
                console.log(data);
            })
            .catch(error => {
                console.error(error);
            });
    </script>
</body>

</html>

2、在1的基础上在fetch中增加中添加mode: 'no-cors' ，然后直接用浏览器打开，F12打开控制台提示报错，POST http://127.0.0.1:1224/api/ocr 500 (Internal Server Error)

http服务下，请求接口会报跨域，能不能麻烦给个解决跨域的示例，谢谢 #52

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