Altering Zetta server response.

body.js

var zetta = require('zetta');
var Photocell = require('zetta-photocell-mock-driver');

zetta()
  .use(Photocell)
  .link('http://localhost:3000')
  .use(function(runtime) {
    var argo = runtime.httpServer.cloud;
    var serverName = runtime.httpServer.zetta.id;

    argo.use(function(handle) {
      handle('response', { affinity: 'sink' }, function(env, next) {
        if (env.request.url !== '/servers/' + serverName) {
          next(env);
          return;
        }

        env.response.getBody(function(err, body) {
          if (err) {
            next(env);
            return;
          }

          body.links.push({ href: 'http://example.com/zetta/styles', rel: ['stylesheet'] });

          env.response.body = body;
          next(env);
        });
      });
    });
  })
  .listen(3001);

header.js

var zetta = require('zetta');
var Photocell = require('zetta-photocell-mock-driver');

zetta()
  .use(Photocell)
  .link('http://localhost:3000')
  .use(function(runtime) {
    var argo = runtime.httpServer.cloud;

    argo.use(function(handle) {
      handle('request', function(env, next) {
        env.response.setHeader('Link', '<http://example.com/zetta/styles>; rel="stylesheet"');
        next(env);
      });
    });
  })
  .listen(3001);