%% You should probably cite rfc7639 instead of this I-D. @techreport{ietf-httpbis-tunnel-protocol-00, number = {draft-ietf-httpbis-tunnel-protocol-00}, type = {Internet-Draft}, institution = {Internet Engineering Task Force}, publisher = {Internet Engineering Task Force}, note = {Work in Progress}, url = {https://datatracker.ietf.org/doc/draft-ietf-httpbis-tunnel-protocol/00/}, author = {Andrew Hutton and Justin Uberti and Martin Thomson}, title = {{The Tunnel-Protocol HTTP Request Header Field}}, pagetotal = 5, year = 2014, month = aug, day = 18, abstract = {This specification allows HTTP CONNECT requests to indicate what protocol will be used within the tunnel once established, using the Tunnel-Protocol request header field.}, }