HTTP protocol request and request messages, response and response messages

HTTP protocol

HTTP protocol, the Hypertext Transfer Protocol (Hypertext Transfer Protocol). Is a rule that specifies the communication between the browser and the server

The HTTP protocol specifies the criteria for requests and responses

request and request messages

Request message for GET request detailed

--------------------------the request line--------------------------------
GET Request Mode
/day02/01.php?username=pp&password=123456 Request Path + parameters (note points)
http/1.1 version number of HTTP
GET/Day02/01.Php?Username=Pp&Password=123456HTTP/1.1
?
--------------------------Request Header--------------------------------
Host:Www.Study.Com
Connection:Keep-Alive
Upgrade-Insecure-Requests:1
User-Agent:Mozilla/5.0 (WindowsNt10.0;WOW64)AppleWebKit/537.36 (Khtml,LikeGecko)Chrome/58.0.3029.96Safari/537.36
Accept:Text/HtmlApplication/Xhtml+XmlApplication/xmlQ=0.9,Image/Webp`*/*`;Q=0.8
 accept-Encoding: gzip, deflate, SDCH 
  accept-language: zh< Span class= "Cm-operator" >-cn,zh; Q=0.8,en; Q=0.6 
  ? 
  //----------------------------request body-------------------------------------
  //get request does not have a request body, but the parameters are stitched into the request line            

Request message for POST request

-----------------------the request line---------------------------------------------
POST/Day02/01.PhpHTTP/1.1
?
-----------------------Request Header--------------------------------------------
Host:Www.Study.Com
Connection:Keep-Alive
The length of the passed parameter.
Content-Length:29
Cache-Control:Max-Age=0
Origin:httpWww.study.com
Upgrade-Insecure-Requests:1
User-Agent:Mozilla/5.0 (WindowsNt10.0;WOW64)AppleWebKit/537.36 (Khtml,LikeGecko)Chrome/58.0.3029.96Safari/537.36
Content type: Form data, this property must be specified if it is a POST request.
Content-Type:Application/X-Www-Form-urlencoded
Accept:Text/HtmlApplication/Xhtml+XmlApplication/xmlQ=0.9,Image/Webp`*/*`;Q=0.8
Referer:httpWww.study.com/day02/01-login.html
Accept-Encoding:Gzipdeflate 
  accept-language: zh- Cn,zh; Q=0.8,en; Q=0.6 
  ? 
  //------------------------request body------------------------------------------
  username=pp &password= 123456              

Get request vs. POST request

• The GET request has no request body because the GET request parameters are stitched into the address bar

• The POST request has a request body, which is the passed parameter

• The POST request needs to specify the Content-type property.

Response and response messages

---------------------Status line (response line)-------------------------------
http/1.1 HTTP Version
200 Status of the response
 200 indicates success
 304 means read cache
 404 means the resource cannot be found
 500 indicates server-side error
HTTP/1.1200Ok
?
----------------------Response Header-----------------------------------------------
Date:Thu,22June201716:51:22Gmt
Server:Apache/2.4.23 (WIN32)Openssl/1.0.2JPhp/5.4.45
X-Powered-By:Php/5.4.45
Content-Length:18
Keep-Alive:Timeout=5,max=100 
  connection: keep- alive 
  //content type, telling the browser how to parse the response result 
  content-type: text< Span class= "Cm-operator" >/html; Charset=utf- 8 
  //----------------------- Response Body------------------------------------------------
  hello world             

HTTP protocol request and request messages, response and response messages