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[Web] Node.js - URL 본문

Computer Language/Web

[Web] Node.js - URL

정우섭 2020. 7. 29. 21:08

URL : http://exampleurl.com:126/main?id=HTML&page=3

 

protocol : which way of internet to follow [http : HyperText Transfer Protocol]

host : Computer which is connected to internet

port : Web basically use port number '80' as default value

path : means which directory's which file of the computer

query string : passes informations such as what is which page to show, always starts with '?' and value is emphasized

(?id=HTML&page=3 means "id is HTML and page is 3")

 

By passed requests of client to query string, the server responses.

 

And developers will make that progress.

 

var http = require('http');
var fs = require('fs');
var url = require('url');

//create server
var app = http.createServer(function(request,response){
	var _url = request.url;
	//parsing directory/file name after 'url.'
	//var pathname = url.parse(request.url).pathname;
	var queryData = url.parse(_url, true).query;
	var title = queryData.id;
	if(_url == '/'){
		title = 'Welcome';
	}
	if(_url == '/favicon.ico'){
		return response.writeHead(404);
	}
	response.writeHead(200);
	var template = `
	<!doctype html>
	<html>
	<head>
	<title>${title}</title>
	<meta charset="utf-8">
	</head>
	<body>
    <h1><a href="/">Web</a></h1>
	<ol>
		<li><a href="/?id=list1">list1</a></li>
		<li><a href="/?id=list2">list2</a></li>
		<li><a href="/?id=list3">list3</a></li>
	</ol>
	<h2>${title}</h2>
	<p>Hypertext Markup Language (HTML) is the standard markup language for
	<strong> creating <u>web</u> pages </strong>and web applications.<br>
	Web browsers receive HTML documents from a web server or from local storage and render them into multimedia web pages.<br>
	HTML describes the structure of a web page semantically and originally included cues for the appearance of the document.
	</p>
	<p style="margin-top:45px;">HTML elements are the building blocks of HTML pages.<br>
	With HTML constructs, images and other objects,
	 such as interactive forms, may be embedded into the rendered page.<br>
	It provides a means to create structured documents by denoting structural semantics for text
	 such as headings, paragraphs, lists, links, quotes and other items.<br>
	HTML elements are delineated by tags, written using angle brackets.
	</p>
	</body>
	</html>
	`;
	response.end(template);

});
app.listen(3000);

 

 

 

require() : Node.js use this function to call module.

[line1,2,3]

what is module?

 

Parsing

[line10]

// urlExmaple.js
 
var url = require('url');
var parsedObject = url.parse('http://user:pass@host.com:8080/p/a/t/h?query=string#hash');

console.log(parsedObject); // print information of url object
console.log(url.format(parsedObject)); // print url object to string

Result

$ node urlExample.js
{ protocol: 'http:',
  slashes: true,
  auth: 'user:pass',
  host: 'host.com:8080',
  port: '8080',
  hostname: 'host.com',
  hash: '#hash',
  search: '?query=string',
  query: 'query=string',
  pathname: '/p/a/t/h',
  path: '/p/a/t/h?query=string',
  href: 'http://user:pass@host.com:8080/p/a/t/h?query=string#hash' }
http://user:pass@host.com:8080/p/a/t/h?query=string#hash

 

 

Reference List

English : https://millermedeiros.github.io/mdoc/examples/node_api/doc/url.html

Korean : https://opentutorials.org/module/938/7369

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