glez
2020-12-08 01:58:07
Further research has shown that the browser itself automatically formats each file as a part of the form submission when the form has an input type="file" control. The file becomes an intrinsic part of the form data submitted and the server side processing knows to look for it as such.
"The following example shows how the contents of a user-specified file may be submitted with a form. The user is prompted for his or her name and a list of file names whose contents should be submitted with the form. By specifying the enctype value of "multipart/form-data", each file's contents will be packaged for submission in a separate section of a multipart document."
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