conditionally decides whether to use date or x-date header depending on availability from client
conditionally decides whether to use date or x-date header depending on availability from client

arekinath/node-http-signature,LeisureLink/node-http-signature,maxogden/node-http-signature,joyent/node-http-signature,bsletten/node-http-signature,dominictarr/ssh-key-to-pem,DinoChiesa/node-http-signature,Aloomaio/node-http-signature