1. How to get request header in HTTP server

const http = require('http');

const server = http.createServer((req, res) => {
  res.end( req.headers['x-test'] );
});

server.listen(82, '127.0.0.1');

• require('http') - import module to work with http protocol,
• http.createServer - creates HTTP server,
• (req, - object with request data,
• res - object to manage response,
• .end( - finished http response with given content,
• req.headers - object with all request headers,
• x-test - sample request header to get value of.

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2. How to set response header in HTTP server

const http = require('http');

const server = http.createServer((req, res) => {
  res.setHeader('Content-Type', 'text/plain')
  res.end();
});

server.listen(82, '127.0.0.1');

• require('http') - import module to work with http protocol,
• http.createServer - creates HTTP server,
• (req, - object with request data,
• res - object to manage response,
• .end( - finished http response with given content,
• .setHeader( - sets response header,
• Content-Type - name of the header to send,
• text/plain - value of the header to send.

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3. How to set content type in HTTP server

const http = require('http');

const server = http.createServer((req, res) => {
  res.setHeader('Content-Type', 'text/csv')
  res.end("1,2,3");
});

server.listen(82, '127.0.0.1');

• require('http') - import module to work with http protocol,
• http.createServer - creates HTTP server,
• (req, - object with request data,
• res - object to manage response,
• .end( - finished http response with given content,
• .setHeader( - sets response header,
• Content-Type - we're going to set content type,
• text/csv - let's send csv content as example.

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4. How to allow CORS in HTTP server

const http = require('http');

const server = http.createServer((req, res) => {
  res.setHeader('Access-Control-Allow-Origin', '*');
  res.setHeader('Access-Control-Allow-Methods', 'OPTIONS, GET');
  res.setHeader('Access-Control-Max-Age', 60*60*24*30);

  res.end('Hi');
});

server.listen(82);

• require('http') - import module to work with http protocol,
• http.createServer - creates HTTP server,
• (req, - object with request data,
• res - object to manage response,
• setHeader( - sets response header,
• Access-Control- - CORS headers to set,
• '*' - allow access from all origins,
• 60*60*24*30 - ACL lifetime is set to 30 days.

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