What is the use of the enctype field when uploading files?
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The enctype attribute of the FORM element specifies the encoding type used when the form data is submitted to the server. The default value is "application/x-www-form-urlencoded". This encoding method will urlencode the content before the form is sent. (Spaces are converted to "+", and special characters are converted to ASCII HEX values). For example, in the form field Fill in bb for firstname,, The result before sending is: bb+%2C%2C However, this encoding is inefficient when sending large amounts of text, text containing non-ASCII characters, or binary data to a server. When uploading files, the encoding type used should be "multipart/form-data", which can send both text data and binary data upload. The ENCTYPE attribute value of the <form> form on the browser side is multipart/form-data, which tells us that the transmitted data must use the multimedia transmission protocol. Since multimedia transmission involves large amounts of data, the uploaded file must be the post method, and the type attribute of <input> must be file. |
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