express utils and middleware

Middleware

• auth: check if the request is made by an authorized person
• cache: checks if the request is cached by any controller and return the cached data
• exec: execute any code, such as logging the request info
• files-parser: parse file uploads.
• host: create a host mapping, i.e. change req.originalUrl based on the hostname
• redirect: redirect the request to another url.
• transformer: modify the response just before it is sent, i.e. before req.send(value)

Errors

• HttpError: an error with HTTP status code.