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HTTP Error 400400 Request ErrorThe server was unable to understand the request because of a malformed syntax. Without modification, the client program cannot repeat the request.HTTP Error 401401.1 Unauthorized: Login failedThis error indicates that
The most comprehensive HTTP header information analysis and HTTP header information analysis
HTTP header explanation
1. Accept: indicates the media type that the WEB Server accepts. */* indicates any type, and type/* indicates all child types of the
The http/1.1 standard has been a widely used and prevailing standard since its inception in 1999.Related documentsRfc2616:hypertext Transfer Protocol--http/1.1In RFC6585, the status codes 428, 429, 431, 511 are added inRFC2616 developed a series of
HTTP packets are divided into request messages and response messages ).
I,Packet Components
An HTTP packet consists of three parts:
(1) start line)
(2) Header)
(3) Body)
Example:
HTTP/1.0 200 OK // start line Content-Type: text/plain // header
HTTP header explanation
1. Accept: indicates the media type that the WEB Server accepts. */* indicates any type, and type/* indicates all child types of the type, type/sub-type. 2. Accept-Charset: the browser declares the character set it
HTTP Header Explanation================================================?AcceptTell the Web server what type of media you accept, */* represents any type, type/* represents all subtypes under that type, Type/sub-type.?Accept-charsetThe browser
Some of the common status codes are:200-Server successfully returned to Web page404-The requested page does not exist503-Service Not availableDetailed decomposition:1XX (Temporary response)A status code that represents a temporary response and
If you send a request to your server to display a webpage on your website (for example, when a user accesses your webpage through a browser or crawls the webpage on googlebot, your server returns the HTTP statusCodeTo respond to this request.
This
201-206 indicates that the server successfully processed the requested status code, indicating that the Web page can be accessed normally. 200 (successful) the server has successfully processed the request. Typically, this indicates that the
201-206 indicates that the server successfully processed the status code of the request, which indicates that the Web page can be accessed normally.200 (success) The server has successfully processed the request. Typically, this indicates that the
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