Basic knowledge of HTTP

This time I will bring you the basic knowledge of HTTP and what are the precautions for using HTTP. The following is a practical case, let's take a look.

stalled: The waiting time is the time from when the browser sends a request to when the request can be sent;
Request sent: from before the first byte of the request is sent to the last one The time since the byte was emitted.
Waiting(TTFB): The time it takes to receive the first byte of the response after the request is issued.
Content Download: The time required from the first byte of the response to the last byte.

#Remote Address: The IP address of the remote server, which is the result of domain name resolution.

Request method:

GET: used to obtain data
POST: used to submit data
PUT: user update data
DELETE: used to delete data
HEAD: used to obtain data, but does not have to return all data
TRACE:...
OPTIONS:....

Status code:

1XX: Instruction information, use Indicates that the request has been received and is ready to be processed
2XX: Indicates that the request is successful
3XX: Indicates redirection
4XX: Indicates client error, syntax error or the request cannot be implemented
5XX: Indicates server Client error, unable to process legitimate request

Common status codes:

200: Success
400: The client request has a syntax error and the server cannot understand
401: The The request may not be authorized
403: The server receives the request but refuses to serve it, possibly because it does not have permission, etc.
404: The resource was not found
500: An unpredictable error occurred on the server side
503: The server side is currently unable to process the client's request, and it may take a while to return to normal

I believe you have mastered the method after reading the case in this article. For more exciting information, please pay attention to other related articles on the php Chinese website!

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