[1] draft-burke-content-signature-00 - HTTP Header for digital signatures ( 版) <http://tools.ietf.org/html/draft-burke-content-signature-00>
[2] draft-thomson-http-content-signature-00 - Content-Signature Header Field for HTTP ( ()) <https://tools.ietf.org/html/draft-thomson-http-content-signature-00>