form What is the use of using enctype field when uploading files_HTML/Xhtml_Web page production

The enctype attribute of the FORM element specifies the encoding type used when submitting form data to the server. The default value is "application/x-www-form-urlencoded".

This encoding method will urlencode the content before sending the form. (Spaces are converted to " ", and special characters are converted to ASCII HEX values).

For example, if we fill in bb in the form field

firstname,

the result we get before sending is: bb,,

However, This encoding is inefficient when sending large amounts of text, text containing non-ASCII characters, or binary data to the server.

When uploading files, the encoding type used should be "multipart/form-data", which can send text data and also supports binary data upload.

The ENCTYPE attribute value of the

form on the browser side is multipart/form-data, which tells us that the data to be transmitted must use the multimedia transmission protocol. Since multimedia transmits a large amount of data, uploading is required The file must be a post method, and the type attribute of must be file.