HTTP Protocol _ 01 _ Request/Response

HTTP Request

An HTTP request consists of three parts: request line, request header domain, and request body.

Agreed request Structure

Request Line

Method
SP Request-Uri
SP HTTP-version
CRLF

Request MethodMethod

Method	Description
Get	Resource identified by the request URI
Post	Request the resource identified by the URI and transmit data
Head	Request to obtain the Response Message Header of the resource identified by the URI
Put	Request to store a resource, similar to put in FTP
Delete	Request the server to delete the resource identified by the URI
Trace	Request Message received by the server
Connect
Options

Request Header domain

Request body

Data content transmitted to the server

Example

1,GetRequest,GetGenerally, requests do not contain Request body content.

2,PostRequest

3,ConnectRequest

HTTPResponse

HTTPThe response is also divided into three parts: Status line, Response Header domain, and response body.

Agreed response structure

Status line

HTTP-version
SP Status-code
SP Reason-phraseCRLF

Status Code

Status Code	Description
1 **	Indicates that the request has been received
2 **	Successful, indicating that the request has been successfully received, parsed, and processed
3 **	Redirection. Further operations must be performed to complete the request.
4 **	Client error. The client sent an invalid request.
5 **	A server error occurs. The server fails to process valid requests.

Response Header domain

Example

1Normal response

Materials

2. Rfc2119/Rfc1945/Rfc2616
4. Http://www.fiddler2.com/fiddler/help/http/headers.asp