title: Other common protocols besides HTTP?
body: <p>I usually pass data between my web servers (in different locations) using HTTP requests (sometimes using SSL if it's sensitive). I was wondering if there were any <strong>lighter protocols</strong> that I might be able to swap HTTP(S) for that would also support public/private keys like SSH or something.</p>
  
  <p>I used PHP sockets to build a SMTP client before so I wouldn't mind doing that if required.</p>