Request message requesting method and status response code in HTTP protocol

An HTTP request message consists of 4 parts:

1. 1. Request Line
   2. Request Header (header)
   3. Blank Line
   4. Request data

The general format of the request message is given:

Request methods are included in the request line, and the common request methods are:

Get: Get a resource from the server HEAD: Get the document's response from the server header POST: Send data to the server PUT: Store the requested body part on the server delete: request to delete the specified document on the server Trace: Trace request arrives at Server intermediate proxy Server options: Request server returns the request method used for the specified resource support

The request header information when searching for HTTP with Baidu:

get/s?wd=http&ie=utf-8&tn=94839763_hao_pg http/1.1Host:www.baidu.comConnection:keep-Alivepragma:no-CACHECAChe-control:no-cacheupgrade-insecure-requests:1user-agent:mozilla/5.0 (Windows NT 10.0; Win64; x64) applewebkit/537.36 (khtml, like Gecko) chrome/66.0.3359.117 Safari/537.36accept:text/html,application/xhtml+xml , APPLICATION/XML;Q=0.9,IMAGE/WEBP,IMAGE/APNG,*/*;Q=0.8REFERER:HTTPS://WWW.BAIDU.COM/S?IE=UTF-8&F=8&RSV _bp=0&rsv_idx=1&tn=baidu&wd=http&rsv_pq=ef45e0e30001a4ba&rsv_t=4a37it%2b5vmcchfm% 2fqss6rl4bozax61q2pbu4cta1x9ro%2bjzyuiqi1cd%2bdwc&rqlang=cn&rsv_enter=1&rsv_sug3=5&rsv_sug1=4 &rsv_sug7=100&rsv_sug2=0&inputt=1596&rsv_sug4=1595&rsv_sug=2&__eis=1&__eist= 335accept-encoding:gzip, deflate, Braccept-language:zh-cn,zh;q=0.9,en;q=0.8cookie:

Common HTTP Status Response codes (HTTP state code) include:

1XX:100-101, Message tip 2xx:200-206, success 3xx:300-305, redirect 4xx:400-415, error class information, client error 5xx:500-505, error class information, server side error common status code:   200: Success , all the requested data is sent through the entity-body portion of the response message; OK   301: The requested URL points to a resource that has been deleted, but in the response message the new location where the resource is now located is indicated by the header position; Moved Permanently   302: Similar to 301, but in the response message through location indicates the resource is now in a temporary new position; Found   304: The client issued a conditional request, but the resource on the server has not changed, the client is notified by responding to this response status code; Modified   401: Need to enter account and password authentication to access resources; unauthorized   403: request is forbidden; Forbidden   404: The server cannot find the resource requested by the client; not Found   500: Server internal error; Internal Server, Error   502: The proxy server received a pseudo-response from the backend server; bad Gateway

When using Baidu to search for HTTP, the response code for successful request:

Request url:https://www.baidu.com/s?wd=http&ie=utf-8&tn=94839763_hao_pgrequest Method:getstatus code:200 Okremote Address:163.177.151.109:443referrer Policy:no-referrer-when-downgrade

Request message requesting method and status response code in HTTP protocol