Introduction to HTTP protocols and software for AJAX learning installation

The 1:HTTP protocol is a stateless protocol that does not maintain a persistent connection, the browser sends a request to the server, and the server promises not to shut down the connection. Next time you need to relax again.

2:http request, Method (Get,post), address (URL), request header (authentication information, client environment), request body (Submitted content, form information, query information)

3:http Response three parts, (numeric status code, indicates a successful or failed request) 404, etc., response header (server type, date, cache = =), Response body (content, query content)

HTTP request message

HTTP response Messages

Status code:

4:xmlhttprequest object used for page flush asynchronous operations

Open (Method,url,async)//Send request Async parameter indicates synchronous request or asynchronous request, true indicates asynchronous request, false indicates synchronous request, default is True

Send (string);//Post send data to the server, GET request content for Null,post request to fill in the content of the submission.

5:xmlhttprequest response

Object returned by the Send () method

Property: ReadyState: A state indicating whether the request was successful

Server snooping and requests

Construction and testing of the environment

1: Download XAMPP Integration Server database and PHP Server Software//self-Baidu download

2:dreamwear establish a site and establish a local server selection Php/mysql

PHP files need to be placed under the htpdos/folder in the XAMPP installation directory//

Client-side Test files: Test the network using a plugin from the postman Google Explorer

51557804//Blog Tutorial

GET request Test

POST request test

application/x-www-form-urlencoded for content Plain text encoding

Introduction to HTTP protocols and software for AJAX learning installation