What is the boundary in multipart/form-data?

Question

Hi, everyone,

I want to ask a question about the multipart/form-data. In the HTTP header, I find that the Content-Type: multipart/form-data; boundary=???. Is the ??? free define by the user? or it is general from the HTML? Is it possible for me to define the ??? = abcdefg? Thank you.

Answer 1

I found this is the answer. http://www.w3.org/TR/html401/interact/forms.html#h-17.13.4.2