set the default mime type to use when there is no messageheaders #content_type header present.this property does not have a default value . concode_field_sep MimeType defaultMimeType concode_field_sep MimeType resolve concode_elem_sep MimeType getDefaultMimeType concode_elem_sep String toString
void function ( MimeType arg0 ) { this . defaultMimeType = arg0 ; }