static missingResource (err, req, res, next) {
    res.status(404);
    console.log('Cannot locate resource requsted from', ArkimeUtil.sanitizeStr(req.path));
    return res.send('Cannot locate resource');
  }
Missing resource error handler for static file endpoints.
Sends a missing resource message to the client by:
1. setting the response status code to 404 (not found)
2. sending a message that the resource cannot be found
This is so the client recieves an understandable message instead of the client index.html
@returns {Object} res - The Express.js response object