On the difference between application/x-www-form-urlencoded and Multipart/form-data

Reproduced from: http://www.jb51.net/article/51377.htm

In the syntax of a FORM element, enctype indicates the format of the submitted data

Use the Enctype property to specify the type of encoding used by the browser when the data is sent back to the server.

Below is the description:

application/x-www-form-urlencoded: Form data is encoded as a name/value pair. This is the standard encoding format.

Multipart/form-data: Form data is encoded as a message, and each control on the page corresponds to one part of the message.

Text/plain: Form data is encoded in plain text without any controls or formatting characters.

Add

The Enctype property of the form is encoded and is commonly used in two ways: application/x-www-form-urlencoded and Multipart/form-data, and the default is application/ X-www-form-urlencoded.

When the action is get, the browser converts the form data into a string (Name1=value1&name2=value2 ...) using x-www-form-urlencoded encoding. , and then append the string to the URL and use the? Split to load the new URL.

When the action is post, the browser encapsulates the form data into the HTTP body and sends it to the server.

If you don't have a type=file control, you can use the default application/x-www-form-urlencoded.

But if you have type=file, you will need to use Multipart/form-data. The browser splits the entire form into controls and adds Content-disposition (form-data or file), Content-type (default Text/plain), name (control name) to each section, and add a separator (boundary).