Basic knowledge of HTTP protocol

1, Http-url:

Protocol, host number: The IP address of a server; Port number: The host above the program number, the general default of 80, many browsers omit not to display; path: directory of work paths

URL Request:

Access host number 123.207.58.25 this host under the 80th service under the root directory under the A directory under the c.php resource, and the submitted data is a=100 and b=20, most browsers in the middle of the URL? Separate the data we want to submit and use & to differentiate each data. The submitted data has always been in the form of Name=value.

2. http-Request

For a URL, https://123.207.58.25:80/a/b/c.php?a=100&b=20, remove the HTTPS, remove the IP, remove the port number, the remaining (a/b/c.php?a=100&b= 20) is the data stored in the URL field.

The data in the request line is:

get/a/b/c.php?a=100&b=20 http/1.0\r\n Note: 1. Get and,/a ... There is a space between b=20 and http/1.0 there is a space between 2. The identity of the \ r \ n of each line is not only the first line, but also the rule is \ r \ n does not allow a separate method field: Get: Request the resource identified by the URL, Method: Enter the URL in the address bar of the browser, the browser uses the Get method post: Attach a new resource after the resource identified by the URL, by asking the requested server to accept the data behind the load method, often used to submit the form. 3. http-response

There is a status code and status code description in the status line, example:

OK---client request succeeded

404 Not found--Request resource is not present

403 firbidden--server rejects received requests, denial of service

Basic knowledge of HTTP protocol