pub fn check_subject(subject: &str) -> Result<()>Expand description
Refuses a subject that would break the header.
Composition::build runs it too; it is public so a caller can refuse
a bad subject before it makes any request.
pub fn check_subject(subject: &str) -> Result<()>Refuses a subject that would break the header.
Composition::build runs it too; it is public so a caller can refuse
a bad subject before it makes any request.