4.7. Content-Transfer-Encoding Deprecated

4.7. Content-Transfer-Encoding Deprecated

Previously, it was recommended that senders use a Content-Transfer-Encoding encoding (such as "quoted-printable") for each non-ASCII part of a multipart/form-data body because that would allow use in transports that only support a "7bit" encoding. This use is deprecated for use in contexts that support binary data such as HTTP. Senders SHOULD NOT generate any parts with a Content-Transfer-Encoding header field.

Currently, no deployed implementations that send such bodies have been discovered.