CORS Proxy Server

The purpose of this project is to create an HTTP proxy server to normalize requests with CORS and facilitate API interactions with any request method and on-the-fly modifications.

Project Benefits

This project simplifies the development process by handling CORS issues and providing a flexible way to interact with APIs, making it easier to test and develop applications.

How the Project Works

The project sets up a proxy server using Node.js that intercepts HTTP requests, adds the necessary CORS headers, and allows for modification of the request and response on the fly.

Repository and Installation

GitHub Repository

To install and run the project:

1. Clone the repository:

   git clone https://github.com/Fulldroper/cors-proxy
   cd cors-proxy

2. Install dependencies and start the server:

   npm install
   npm start

How to use?

Make default requests to / path and set header cors-url with site url

For ignore headers set header cors-ignore with array of headers will be deleted from request

all methods, headers, params duplicated automatically

How change port?

1. Create file .env
2. write PORT=<Your port>
3. Save changes

How change enterpoint?

Change or add to file .env next line ENTERPOINT=/

How change alowed methods?

Change or add to file .env next line ALOWED=GET, POST, PUT, DELETE

Project Workflow

1. Setup Project: Initialize the project structure and dependencies.

   npm init
   npm install

2. Create Proxy Server: Set up the proxy server with CORS handling.

   const express = require('express');
   const { createProxyMiddleware } = require('http-proxy-middleware');
   const app = express();
   
   app.use('/', createProxyMiddleware({
       target: 'http://example.com',
       changeOrigin: true,
       onProxyReq: (proxyReq, req, res) => {
           // Modify request headers
           proxyReq.setHeader('X-Special-Proxy-Header', 'foobar');
       },
       onProxyRes: (proxyRes, req, res) => {
           // Modify response headers
           proxyRes.headers['X-Special-Proxy-Response-Header'] = 'baz';
       }
   }));
   
   app.listen(3000, () => {
       console.log('CORS proxy server running on port 3000');
   });

Skills Gained

• Developing proxy servers with Node.js
• Handling CORS issues in web development
• Modifying HTTP requests and responses on the fly