How to solve the problem of third-party interface returning 403 in Node.js environment?

Catching third-party API 403 errors under Node.js environment

When calling external APIs using Node.js, you often encounter headaches of 403 errors (access is prohibited). This is usually because the server restricts the source of the request. This article will provide several solutions to help you obtain data smoothly.

Problem description: Target API address: https://core-api.prod.blur.io/v1/prices . It can be accessed normally in the browser (regardless of whether the privacy mode is enabled or not), but using fetch in Node.js returns a 403 error.

Sample code:

 let response = await fetch('https://core-api.prod.blur.io/v1/prices');
const data = await response.text();
console.log(data); // 403 Error

Since we cannot directly modify the target website settings, we need to find a solution on the Node.js side.

Solution:

1. Simulate browser request header: The browser request will carry a specific request header, which the server may use to identify the request source. By emulating these request headers in Node.js, the server can be tricked into thinking that the request comes from the browser.

   Modified code:

    let response = await fetch('https://core-api.prod.blur.io/v1/prices', {
     headers: {
       'user-agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/58.0.3029.110 Safari/537.36',
       'accept': 'application/json',
       'content-type': 'application/json',
       // Add authorization information if necessary 'authorization': 'Bearer your_access_token' 
     }
   });

   The value of authorization field needs to be adjusted according to the authentication mechanism of the API.

2. By using JSONP: JSONP (JSON with Padding)<script>标签发起请求，绕过同源策略限制，服务器通常不会对JSONP请求进行同样的访问限制。</script>

   需要安装jsonp模块：npm install jsonp

   代码示例：

   const jsonp = require('jsonp');
   
   jsonp('https://core-api.prod.blur.io/v1/prices', null, (err, data) => {
     if (err) {
       console.error(err.message);
     } else {
       console.log(data);
     }
   });

   注意：JSONP只支持GET请求。

通过以上方法，您可以尝试解决Node.js环境下调用第三方API时遇到的403错误。 选择哪种方法取决于API的具体要求和限制。 如果问题仍然存在，请检查API文档，确认是否需要其他设置或授权。

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