A data request message format

There are four data format of the request message. In the Network Browser Developer Tools page, you can view the information. The following four kinds of data format of the request message is introduced, describes 请求行and 请求头.

(1) Request line

	GET/login.html HTTP/1.1

Cong left to right, respectively 请求方式 请求url 请求协议/版本.

Request mode : http protocol has seven kinds of request methods commonly used are get and post in two ways:


  • Request parameters in the request line. (It may also be understood as the url)
  • url requests limited length.
  • Insecurity.

Here Insert Picture DescriptionHere Insert Picture Description


  • Request parameters in the request body.
  • url length of the request is not limited.
  • Safety.
    Here Insert Picture Description

(2) the request header

Request header is a key-value pairs: 请求头名称:请求头值.

Request heads are 客户端告诉服务器一些信息.

Host: localhost:8080
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:69.0) Gecko/20100101 Firefox/69.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: zh-CN,zh;q=0.8,zh-TW;q=0.7,zh-HK;q=0.5,en-US;q=0.3,en;q=0.2
Accept-Encoding: gzip, deflate
Content-Type: application/x-www-form-urlencoded
Content-Length: 12
Connection: keep-alive
Referer: http://localhost:8080/Servlet&http&request/login.html
Upgrade-Insecure-Requests: 1
Request header Request header value
Host Requesting host
User-Agent The browser used to access the server 浏览器版本信息(the server after the acquisition, to resolve browser compatibility issues)
Accept Supported file formats
Accept-Language Supported languages
Accept-Encoding Supported compression formats
Referer 告诉服务器,请求从哪里来。作用:1.防盗链2.统计工作
Connection Shows a state of connection (alive can be multiplexed)
Upgrade-Insecure-Requests Information about upgrading

(3) Request blank lines

Request header for dividing the POST request, and the request body.

(4) the request body (body)

Package POST Request message parameter.

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