Notes-http protocol

Request:

Request Line --GET | post/1.html HTTP/1.1 // request method, page

Request Header--

Accept: text/html, image/* // tell the server the file format supported by the client

Accept-charset: UTF-8 // The encoding used by the client

Accept-encoding: gzip // client-supported Encoding

HOST: localhost // The host name that the client wants to access

If-modified-since: 18:00:00 GMT // tell the server the time point of the Client Cache

Referer: http: // www.xx.com/index.html // tell the server where the request is sent

User-Agent: chome/24 (compatible; MSIE 5.5; windows7) // tell the server about the client's software environment

Connection: Close | keep-alive // The connection is closed or maintained after connection.

Date: 18:00:00 GMT // request time

--- Empty row

Body --When the request is post, it can be used with data

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Reponse:

Status line -- HTTP/1.1 200 OK // HTTP Version Status Code Description

1xx // the server has received the request, but the client can complete the following work only after another request

2XX // receives the request and responds successfully

3xx // The request fails. The client further requests

4xx // client Error

5xx // server error

Response Header -- // describe server information and notify the client to process data

Location: http://www.baidu.com // With 302 use tells client to request Baidu

Content-encoding:

Content-lenght

-- Empty line

Body -- // The data returned to the client