How to write a redirection code yourself

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When writing code to handle HTTP redirects, the specific implementation depends on the programming language and framework you use. Here are simple examples of implementing redirection in several different programming languages ​​and frameworks:

Python - Flask

In Python's Flask framework, you can use redirect()functions for redirection:

from flask import Flask, redirect

app = Flask(__name__)

@app.route('/old_url')
def old_url():
    return redirect('/new_url', code=302)

@app.route('/new_url')
def new_url():
    return "This is the new URL"

if __name__ == '__main__':
    app.run()

Python - Django

In Django you can use HttpResponseRedirect:

from django.http import HttpResponseRedirect

def old_view(request):
    return HttpResponseRedirect('/new_view/')

Node.js - Express

In the Express framework for Node.js:

const express = require('express');
const app = express();

app.get('/old_url', (req, res) => {
    
    
    res.redirect('/new_url');
});

app.get('/new_url', (req, res) => {
    
    
    res.send('This is the new URL');
});

app.listen(3000);

PHP

In PHP you can use header()functions:

<?php
header('Location: /new_url.php');
exit;
?>

Java - Servlet

In Java Servlet:

response.setStatus(HttpServletResponse.SC_MOVED_TEMPORARILY);
response.setHeader("Location", "new_url.jsp");

The above are just simple redirect examples. In actual applications, redirection usually involves more logic, such as condition checking, authentication, etc. Depending on your needs, you can also set different types of HTTP status codes for redirection, such as 301 (permanent redirection), 302 (temporary redirection), etc.