What is the '-' in multipart/form-data?

Question

I want to ask a question about the multipart/form data. I find the http header of multipart post and the Content-Type: multipart/form-data; boundary=-----...---boundaryNumbe

Answer 1

It is completely arbitrary.

The point of the boundary is to define the beginning and ending of your data. It does not matter what it is, as long as it is not part of the content.