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  <h1>NITRO</h1>
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<article>
  <section>
    <h3>INTRO</h3>
    <p>The <a href="https://github.com/synrc/nitro/blob/master/src/nitro_n2o.erl">nitro_n2o</a> module provides
      <a href="http://nitrogenproject.com/demos">Nitrogen Web Framework</a>
      protocol specification and implementation.</p>
  </section>
  <section>
    <h3>INIT</h3>
    <p>Init message invokes event(init) function in page module.
       There are two binary representations of INIT message.
       The first one is BERT encoded #init record with binary
       token that usually issued by n2o_session, transported in #io record
       as data parameter and stored on client side in localStorage or Key Chain.
       Clients with invalid tokens are being registered and reissued.</p>
    <figure>
      <code>
  -record(init, { token :: binary() }).
      </code>
    </figure>
    <p>The second one is TEXT encoded version of message, &lt;&lt;"N2O,"&gt;&gt;
      that usually works for hosts with raw binary falicities as WebSockets.
    </p>
    <figure>
      <code>
  &#60;&#60;"N2O,",Token/binary&#62;&#62;
      </code>
    </figure>
    <p>For token issue protocol see <a href="n2o_session.htm">n2o_session</a> module.</p>
  </section>
  <section>
    <h3>PICKLE</h3>
    <p>Pickle message sends to server prerendered (by server) encripted message.
       These messages hold #ev record with callee information (encripted).
       Pickled messaged can prolongate expiration field in session token (renewed)
       by updating client token on each UI request (tracking user activity) when
       n2o application variable <b>nitro_prolongate</b> equals <b>true</b>.</p>
    <div>
    <figure>
      <code>
  -record(pickle, { source  = [] :: [] | binary(),
                    pickled = [] :: [] | binary(),
                    args    = [] :: list({atom(),any()}) }).

  -record(ev,   { module  = [] :: [] | atom(),
                  msg     = [] :: any(),
                  trigger = [] :: [] | binary(),
                  name    = [] :: [] | binary() }).
      </code>
    </figure>
    </div>
  </section>
  <section>
    <h3>DIRECT</h3>
    <p>Direct message sends data without any convertation or encription or session logic.</p>
    <div>
      <figure>
        <code>
  -record(direct, { data = [] :: any() }).
        </code>
      </figure>
    </div>
  </section>
  <section>
    <h3>FLUSH</h3>
    <p>Flush message only redirects data to the socket.</p>
    <div>
      <figure>
        <code>
  -record(flush, { data = [] :: [] | list(#action{}) }).
        </code>
      </figure>
    </div>
  </section>
  <section>
    <p>You may also want to read:
      <b><a href="n2o_heart.htm">n2o_heart</a></b>,
      <a href="n2o_ftp.htm">n2o_ftp</a>.
    </p>
  </section>
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