add cors headers to a http server in typescript

To add CORS headers to a Node.js HTTP server written in TypeScript, you can use a middleware function that intercepts incoming requests and adds the necessary headers.

Here is an example middleware function that adds CORS headers:


index.ts
import { Request, Response, NextFunction } from 'express';

export function corsMiddleware(req: Request, res: Response, next: NextFunction): void {
  res.setHeader('Access-Control-Allow-Origin', '*');
  res.setHeader('Access-Control-Allow-Methods', 'GET, POST, PUT, DELETE');
  res.setHeader('Access-Control-Allow-Headers', 'Origin, X-Requested-With, Content-Type, Accept');
  next();
}
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To use this middleware with your HTTP server, simply add it to the chain of middleware functions using the use method of the Express application object:


index.ts
import express from 'express';
import { corsMiddleware } from './middlewares/cors';

const app = express();

app.use(corsMiddleware);
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This will add the CORS headers to all requests handled by your server. Note that you can adjust the values of the headers according to your specific needs.

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