Nodejs does not need to install https

When developing Node.js applications, we often need to implement HTTPS requests and responses to ensure communication security and data encryption. A common approach is to install and configure Node.js' own HTTPS module, or to use a third-party module to implement HTTPS. However, in some cases, we may not need to install HTTPS and can implement HTTPS communication without using the HTTPS module.

Generally speaking, to develop an HTTPS application, we need to convert the HTTP server to an HTTPS server. The HTTP server is bound to port 80, while the HTTPS server is bound to port 443. HTTPS servers require an SSL certificate to create an encrypted channel. Therefore, a common approach is to install and configure Node.js' own HTTPS module, or use a third-party module.

However, in some cases, such as when we are just debugging an application locally, or our application only needs to make simple HTTP requests and responses without real HTTPS encrypted communication, then we can Bypass the steps to install the HTTPS module and implement HTTPS communication directly on the HTTP server.

The specific implementation method is as follows:

First, you need to add HTTPS support on the HTTP server:

const http = require('http');
const https = require('https');
const fs = require('fs');

const options = {
  key: fs.readFileSync('key.pem'),
  cert: fs.readFileSync('cert.pem')
};

const server = http.createServer((req, res) => {
  res.writeHead(200, {'Content-Type': 'text/plain'});
  res.end('Hello World!
');
});

https.createServer(options, server).listen(443);

Here we use Node.js’s built-in https.createServer( ) method to create an HTTPS server, and use the Node.js built-in http.createServer() method to create an HTTP server. Here you also need to load the fs module to read the SSL certificate. key.pem and cert.pem are the private and public keys of the SSL certificate. This is a very simple example, it just replies with a 'Hello World!' response.

It should be noted that the HTTPS server created here depends on the HTTP server, so the HTTP server object server needs to be passed as a parameter to the https.createServer() method .

Next, we need to redirect the browser to the HTTPS server we created.

const http = require('http');
const https = require('https');
const fs = require('fs');

const options = {
  key: fs.readFileSync('key.pem'),
  cert: fs.readFileSync('cert.pem')
};

const httpServer = http.createServer((req, res) => {
  res.writeHead(301, { "Location": "https://" + req.headers['host'] + req.url });
  res.end();
});

const httpsServer = https.createServer(options, (req, res) => {
  res.writeHead(200, {'Content-Type': 'text/plain'});
  res.end('Hello World!
');
}).listen(443);

httpServer.listen(80);

Here we create an HTTP server and listen to port 80. When the client requests the HTTP server, we will redirect the client to the HTTPS server and keep the URL requested by the client unchanged. This way the client can communicate with the server over HTTPS and our data is protected by encryption.

It should be noted that the redirection here is set by setting res.writeHead(301, { "Location": "https://" req.headers['host'] req.url }) to achieve. 301 is the redirection status code, indicating permanent redirection. req.headers['host'] is the host address requested by the client, req.url is the URL path requested by the client.

When the client requests the HTTPS server, we can create a response and send it back to the client as before. Of course, in a production environment we should ensure that our HTTPS server is properly configured and secure.

In summary, even if we do not use the HTTPS module, we can implement HTTPS communication in Node.js applications by redirecting HTTP requests to an HTTPS server with only a few lines of code. Of course, we should carefully consider whether to use this method. When we need to encrypt communication and ensure security, we should use regular HTTPS modules or third-party modules.

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