The difference between Get request and Post request in HTML_html/css_WEB-ITnose

First, set the request method through method in HTML as follows, and the action is to set the page that accepts HTML data.

<span style="font-size:18px;"><form action="WebForm1.aspx" method="post"></form></span>

Get is a request to the server for data.

Post is a request to submit data to the server.

Get gets the information, the parameters it requests will follow the URL in the browser address bar (explanation URL: UniformResource Locator, every file on the Internet has its own URL) Make a transfer.

For example: http://zhidao.baidu.html? fr=chd&test=1 What follows "?" is to obtain the value of the parameter through the URL. "&" is used to connect fr and test, that is, between parameters and parameters.

If you use Get to transfer values ​​in the application, you need to use Request.QueryString["Parameter Name"] as follows:

The title columns are all hyperlinks , as shown in the picture, when the mouse moves to the link titled "kkk" and the serial number is "16", a column of words will be displayed in the lower left corner of the web page. This column of words is the URL of the next web page to be opened, among which " ?" is followed by "? newsid=16", which is the parameter and parameter value after the URL.

Because all our subsequent data is stored in the database, the news page is no exception and is also stored in the database. The title column of this page is If the title is a link, a new page will be opened to display the news content. However, how to determine that the corresponding news content will be displayed after clicking a certain title is based on the newid parameter in the URL.

There is a hyperlink in the title, so when clicked, the news content page (NewsContent.aspx) will be loaded. Define variables in NewsContent.aspx and use the following code to obtain the parameters passed by newsid in the URL." 16"

string newsid = Request.QueryString["newsid"];

Then write a method in layer D to find news according to the news id number, and use the defined string variable when using it newsid is used as a parameter, and the final page displayed is as follows.

The Post request is sent to the web server as the content of the http message, and each field and its value in the form is placed in the Header of the HTML ( message header) and sent to the URL address pointed to by the ACTION attribute. We cannot see this process. Generally, Request.Form["Parameter Name"] or Request.Form.Get("Parameter Name") is used to obtain the value in the specified URL.

Summary

The Get request method is relatively unsafe because the home data is placed after the URL, and the size of the data it can carry is limited. Post is not subject to such a display. When using it, you must choose the appropriate method according to the actual situation!