Node.js returns different data according to different request paths.

1. Learn to return different data according to different request paths:

var url=req.url //Get the req.url value (req: is the abbreviation of request)
req.url : Get the path after the port number to achieve different paths to return different data

My port number: 3000, URL: http://127.0.0.1:3000

if(url==='/'){

res.end('index page') //If the input URL is: http://127.0.0.1:3000/
//Respond to the data in brackets and send the data to the server for display
}

if(url==='/login')
{

res.end('login page') //If the input URL is: http://127.0.0.1:3000/login
//Respond to the data in brackets and send the data to the server for display
}

var http = require("http"); // http module http.createServer(function(req, res) {
//res.write('hello')
//res.write('world!')
 // res.end('index page');

var url=req.url //Get req.url value if(url==='/'){

res.end('index page') //Content ends}else if(url==='/login')
{

res.end('login page')


}else{

  res.end('404')
}

console.log(req.url);

}).listen(3000); // Listen to port 3000
 
console.log("HTTP server is listening at port 3000. The URL is http://127.0.0.1:3000");

result:

2. Data sent: data type and encoding: Content-Type

res.setHeader('Content-Type','text/plain; charset=utf-8')
res.setHeader('Content-Type','text/html; charset=utf-8')
text/plain: Plain text: If the content is an HTML tag, you need to change it to: text/html
res.end(“helloworld”); Use text/plain

res.end('<p>Who am I<a>Click</a></p>') //Use text/html to be recognized by the browser

charset=utf-8 : The content is encoded in utf-8

3. About reading files: relative path and absolute path:

This relative path is actually relative to the path where the node command is executed:

var fs=require(“fs”) //fs has many API functions, get the fs object
fs.readFile()//Read the file I execute the node command in: d:\node1.js
The file 07.html is in the directory: d:node1.js;
So: fs.readFile('./07.html', funtion(){ })
You can read the file; pass the content to data
Again
res.end(data)
Just write the HTML content in: res.red() and open the web page to see s.end

var http = require("http"); // http module var fs = require("fs")
   //var url=req.url;
http.createServer(function(req, res) {


//res.write('hello')
//res.write('world!')
 // res.end('index page');
 fs.readFile('./07.html',function(err,data) {
    
if(err){

res.setHeader('Content-Type','text/plain; charset=utf-8')

     res.end('wss')

}
else{

res.setHeader('Content-Type','text/html; charset=utf-8')
res.end(data)

}

 })


}).listen(3000);
console.log("service")

result:

4. Read pictures

fs.readFile('./07.jpg',function(err,data)
res.setHeader('Content-Type','image/jpeg; charset=utf-8')
res.end(data) //Main code

This concludes this article about the detailed process of node.js returning different data according to different request paths. For more relevant node.js request paths and data content, please search for previous articles on 123WORDPRESS.COM or continue to browse the related articles below. I hope everyone will support 123WORDPRESS.COM in the future!