Web Design Notes-Chapter I: Fundamentals

1,web Server (1) Web server operations

The Web browser communicates with the Web server by sending a URL to the server. A URL can specify one of two different resources: a file or a program.

All communication between the Web client and the Web server uses standard Web protocol HTTP.

(2) General features of the server

There are two directories for the Web server's file structure: the document root and the server root directory. The document root user has direct access to the server root that allows only administrator access.

2, Hyper-Text Transfer Protocol HTTP

The HTTP contains two phases: the request phase and the response phase. Each HTTP communication (request or response) between the user agent and the Web server consists of two parts: the head and the body. The header contains information about the communication, and the subject contains the data of the communication.

(1) Request phase

Common formats for requests:

http method  Domain name  http version header field empty line message body

The request method has Get,post,head,put and delete, the most common is get and POST.

(2) Response phase

The common format for HTTP responses is as follows:

Status line Response Header field blank line response body

Status code:

Start number	Category
1	Information
2	Success
3	redirect
4	Client Error
5	Service-side Error

3 Security

There are 4 features of web security: Privacy, integrity, verifiable, non-repudiation.

4 Web Programming Toolbox

HTML: Hypertext Markup Language

PHP: Server-side scripting language specifically designed for Web

Flash: A plug-in for authoring environments and players

ajax:asynchronous JavaScript and XML, asynchronous JavaScript and XML. Communication with the server is asynchronous.

Web Design Notes-Chapter I: Fundamentals