docs: function onResponse(type, pRes) {
      contentTypes[type] = pRes.headers['content-type'].split(';')[0];
      responses[type]    = pRes;
  
      //
      // If we have both a public and a private
      // response.
      //
      if (responses.public && responses.private) {
        if (contentTypes.public === contentTypes.private) {
          return self.merge.handlers[contentTypes.public](req, res, responses);
        }
  
        res.writeHead(500, { 'content-type': 'text/plain' });
        res.end('Content-Type mismatch: ' + JSON.stringify(contentTypes));
      }
    }