node web module
web server
Web server refers to website server, which refers to a program residing on the Internet, the basic function of web browser, and provides information browsing service
The web supports the script language on the server side. The script language obtains data from the database and returns the results to the client browser
Basic architecture of web application
Client => Server => Business => Data Client I.e. client, through http Protocol requests server Server Server side web Server, receiving client request and sending response data to client Business The business layer, through Web Server deals with application program, interaction of database, logical operation, calling external program Data Data layer, storing data
Creating a Web server with Node
Create using http module
You need to use the substr() method, a method that returns the specified end from the specified location. The last parameter inherited from String can be saved https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Reference/Global_Objects/String/substr
// server.js
// Import module
var http = require('http'); // http Modular
var fs = require('fs'); // fs File module
var url = require('url'); // url Uniform resource locator module
// Create server
http.createServer((request, response) => {
// Parse the request and save it in the variable
var pathname = url.parse(request.url).pathname;
// Filename of the output request
console.log(pathname);
// Read the file from the file system and return
fs.readFile(pathname.substr(1), (err, data) => { // Use substr Method to read the bytes of the file and return the file name to the callback function
if (err){ // Handling errors
console.log(err); // Print out error
// Return to one404
response.writeHead(404, {'Content-Type': 'text/html; charset=utf-8'});
response.write("Ah, nothing╮(╯_╰)╭");
response.write('I guess what you want ' + data + ' ?');
response.end();
} else {
// Return 200
response.writeHead(200, {'Content-Type': 'text/html; charset=utf-8'});
// Return to file content
response.write(data.toString()); // String the contents of the read file and output
response.end(); // Close connection,Send out data
};
});
}).listen(1937);// index.html
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>This is a small Dome</title>
</head>
<body>
<h1>hello word!</h1>
</body>
</html>Visit http://127.0.0.1:1937/index.html
hello word appears, complete!
PS C:\Users\mingm\Desktop\test> node Server.js
/index.html
/
/input.html
/
{ [Error: ENOENT: no such file or directory, open 'C:\Users\mingm\Desktop\test\input.html']
errno: -4058,
code: 'ENOENT',
syscall: 'open',
path: 'C:\\Users\\mingm\\Desktop\\test\\input.html' }
Improve a little
Visit / appear 404, indicating no home page is set, set home page
// Add support for home page. Set the default home page as index.html
if (pathname === '/') {
pathname = pathname + 'index.html';
}The completed documents are as follows
// Import module
var http = require('http'); // http Modular
var fs = require('fs'); // fs File module
var url = require('url'); // url Uniform resource locator module
// Create server
http.createServer((request, response) => {
// Parse the request and save it in the variable
var pathname = url.parse(request.url).pathname;
// Filename of the output request
console.log(pathname);
// Add support for home page,Set the default home page as index.html
if (pathname === '/') {
pathname = pathname + 'index.html';
}
// Read the file from the file system and return
fs.readFile(pathname.substr(1), (err, data) => { // Use substr Method to read the bytes of the file and return the file name to the callback function
if (err){ // Handling errors
console.log(err); // Print out error
// Return to one404
response.writeHead(404, {'Content-Type': 'text/html; charset=utf-8'});
response.write("Ah, nothing╮(╯_╰)╭");
response.write('I guess what you want ' + data + ' ?');
response.end();
} else {
// Return 200
response.writeHead(200, {'Content-Type': 'text/html; charset=utf-8'});
// Return to file content
response.write(data.toString()); // String the contents of the read file and output
response.end(); // Close connection,Send out data
};
});
}).listen(1937);Creating clients with node s
PS C:\Users\mingm\Desktop\test> node get.js
<html>
<head><title>302 Found</title></head>
<body bgcolor="white">
<center><h1>302 Found</h1></center>
<hr><center>nginx</center>
</body>
</html>
PS C:\Users\mingm\Desktop\test>var http = require('http');
// Requested options
var options = { // Create an object to save related data
host:'www.iming.info', // Host address
port:'443', // Access port
method:'GET',
path:'/', // Files accessed
};
// Callback function to process the response
var callback = (response) => {
// Update data
var body = '';
response.on('data', (data) => { // Binding event, data
body += data;
});
response.on('end', () => { // Bind end event
console.log(body);
});
};
// Start sending request
var req = http.request(options, callback); // Send the request. options is the option to send the request. Callback is the callback function to process the request. Three events will be thrown, one for data, one for end and one for error. The end indicates that the request is completed and the connection is closed
req.end(); // Close connectionBecause the small station uses nginx's https, uses a certificate, and needs to use the process of verifying the secret key, so it is denied access. 302 has no permission