HTML (1) href and Action, get post, hrefaction

HTML (1) href and Action, get post, hrefaction

1. Differences between href and Action

 

Href can only get parameters, and action can get and post parameters.

Href is generally used for a single connection and can contain parameters (URL rewriting). It is requested in get mode and all parameters can be seen in the address bar;

Action is also used for form submission (such as registration). It can submit a large number of complicated parameters, and can be submitted through post or get. If the post method is selected, the submitted information is not displayed in the address bar. To put it simply: connect to an address separately, use href, submit and register information, and use action

 

2. Difference Between get and post

 

The get and post methods in Form correspond to the GET and POST methods in the HTTP protocol during data transmission. The main differences between the two are as follows:

1. Get is used to obtain data from the server, while Post is used to transmit data to the server. 2

Get adds the data in the form to the URL pointed to by action in the form of variable = value, and the two use "?" And each variable is connected by "&". Post puts the data in the form data body and passes the data to the URL indicated by the action according to the corresponding variables and values.

3. Get is insecure because data is stored in the request URL during transmission, nowadays, many existing servers, proxy servers, or user proxies record the request URL to a log file and place it in a certain place, so that some private information may be seen by a third party. In addition, you can directly view the submitted data in the browser. Some internal messages are displayed in front of the user. All Post operations are invisible to users.

4. Get transmission has a small amount of data, mainly because it is restricted by the URL length; while Post can transmit a large amount of data, so only Post can be used for uploading files (of course, there is another reason, as mentioned later ).

5. Get restricts that the dataset value of Form forms must be ASCII characters, while Post supports the entire iso000046 character set.

6. Get is the default Form method. The action quotation marks indicate the path method, for example, to the email address or other web pages.