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Redirecting requests in Node.js
Now we have an App.js file shown below, we want to redirect the user back to ‘/’ once user name is received by node server. We will store user name in a file named username.txt
Initial App.js file −
const http = require('http');
const server = http.createServer((req, res)=>{
const url = req.url;
if(url === '/'){
res.write('<html>');
res.write('<head> <title> Hello TutorialsPoint </title> </head>');
res.write(' <body> <form action="/username" method="POST"> <input type="text" name="username"/> <button type="submit">Submit</button> </body>');
res.write('</html>');
return res.end();
}
res.write('<html>');
res.write('<head> <title> Hello TutorialsPoint </title> </head>');
res.write(' <body> Hello </body>');
res.write('</html>');
res.end();
});
server.listen(3000);
We added below if block which consists the redirection .
First added file system module using const fs = require('fs'); File system fs module gives us writeFile and writeFileSync method to write content to file. As of now we are only writing a test value to file. Later we will see how to write value from request.
First added file system module using const fs = require('fs'); File system fs module gives us writeFile and writeFileSync method to write content to file. As of now we are only writing a test value to file. Later we will see how to write value from request.
if(url === '/username' && req.method === 'POST'){
fs.writeFileSync('username.txt', 'test value');
//redirect
res.statusCode=302;
res.setHeader('Location','/');
return res.end();
}
Http redirect status code is 302. ‘Location’ is also a header which is set in response. Location header is pointing to url ‘/’. This is where the response will be redirected to.
User input output screen
After redirection, we will be back to same page with a file created in project directory .
Complete updated App.js file is −
const http = require('http');
const fs = require('fs');
const server = http.createServer((req, res)=>{
const url = req.url;
if(url === '/'){
res.write('<html>');
res.write('<head> <title> Hello TutorialsPoint </title> </head>');
res.write(' <body> <form action="/username" method="POST"> <input type="text" name="username"/> <button type="submit">Submit</button> </body>');
res.write('</html>');
return res.end();
}
if(url === '/username' && req.method === 'POST'){
fs.writeFileSync('username.txt', 'test value');
//redirect
res.statusCode=302;
res.setHeader('Location','/');
return res.end();
}
res.write('<html>');
res.write('<head> <title> Hello TutorialsPoint </title> </head>');
res.write(' <body> Hello </body>');
res.write('</html>');
res.end();
});
server.listen(3000); 
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