Handling CORS Errors

When using the Qube API, CORS errors may occur in a browser environment. CORS (Cross-Origin Resource Sharing) is a browser security feature that restricts resource sharing between different origins (domain, port, or protocol).

Solutions

To prevent CORS errors, adopt one of the following methods:

1. Using a Proxy Server

   • Instead of calling the API directly from the client, send requests through a proxy server.

   • Using a proxy server allows you to bypass CORS restrictions while securely accessing the API.

   Example of Proxy Setup

   • Setting up a proxy with an Express server:

     const express = require('express');
     const { createProxyMiddleware } = require('http-proxy-middleware');
     
     const app = express();
     app.use(
       '/api',
       createProxyMiddleware({
         target: '<https://www.0xqube.xyz>',
         changeOrigin: true,
       })
     );
     app.listen(3000);

2. Server-Side Implementation

   • Call the API directly from the backend server instead of the browser.

   • This approach avoids CORS errors specific to browser environments.