Specifies the Content-Type header for unencrypted data.
								If the encrypt is enabled, this option is ignored, and the
								Content-Type header is set to application/json for the ciphertext
							JSON envelope.
Ignore etag for concurrency control and force file to be written.
Encrypt the data with the app public key.
								If a string is specified, it is used as the public key.
							If the boolean true is specified then the current user's app public key is used.
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Specify a valid MIME type, encryption options, and whether to sign the [[UserSession.putFile]].