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4.7. Content-Transfer-Encoding Deprecated

4.7. Content-Transfer-Encoding Deprecated​

Historically, HTML form data has been sent using Content-Transfer-Encoding in some implementations. However, in contexts where binary data can be sent (as is the case for HTTP), Content-Transfer-Encoding is unnecessary and SHOULD NOT be used.

Because of legacy implementations, recipients SHOULD be prepared to process multipart/form-data that contains parts with Content-Transfer-Encoding, even though such use is deprecated.