4.1. "Boundary" Parameter of multipart/form-data

4.1. "Boundary" Parameter of multipart/form-data

As with other multipart types, the parts are delimited with a boundary delimiter, constructed using CRLF, "--", and the value of the "boundary" parameter. The boundary is supplied as a "boundary" parameter to the multipart/form-data type. As noted in Section 5.1 of [RFC2046], the boundary delimiter MUST NOT appear inside any of the encapsulated parts, and it is often necessary to enclose the "boundary" parameter values in quotes in the Content-Type header field.