anchor.diff:  
   + Response 422 (application/json)
       + Attributes (object)
  -        + error (string) - Textual description of the HTTP status
  +        + status (string) - Textual description of the HTTP status
           + message (string) - Detailed error information, e.g. hint about malformed request
           + i18n (string) - A unique token representing above error description message; can be used for internationalization in frontends
   
  
positive.code:         + i18n (string) - A unique token representing above message; can be used for internationalization in frontends
  
              A comprehensive list of possible messages:
              - `USER_SET_RANK_SUCCESSFULLY` if the rank of the supplied user has been changed successfully
  
  + Response 400 (application/json)
      + Attributes (object)
          + error (string) - Textual description of the HTTP status
          + message (string) - Detailed error information, e.g. hint about malformed request
          + i18n (string) - A unique token representing above error description message; can be used for internationalization in frontends
  
              A comprehensive list of possible errors:
              - `SETRANK_MISSING_USERNAME` if no input for `username` was submitted
              - `SETRANK_MISSING_RANK` if no input for `rank` was submitted
              - `SETRANK_INVALID_USERNAME` if the submitted `username` is malformed (regex: ^[a-zA-Z0-9\\-\\.]{3,20}$)
              - `SETRANK_INVALID_RANK` if the submitted `rank` is malformed or out of range (regex: ^[1-3]$)
              - `USER_DOES_NOT_EXIST` if no account with the supplied `username` exists
  
  + Response 401 (application/json)
      + Attributes (object)
          + error (string) - Textual description of the HTTP status
          + message (string) - Detailed error information, e.g. hint about malformed request
          + i18n (string) - A unique token representing above error description message; can be used for internationalization in frontends
  
  
negative.code: 
  
  # Data Structures
  
  ## User List (object)
  
  + elements (number) - How many users the response list contains
  + users (array[User Preview]) - A list of previews for users
  + offset (number) - How many entries have been skipped for the output; this information can be used for pagination
  + remaining (number) - How many entries have not been displayed yet; when adding this value to the offset (and not exceeding the row limit), all entries should have been displayed once
  
  ## User Preview (object)
  
  + username (string) - The users name
  + email (string) - The users email
  + created_at (number) - A timestamp of the moment when the entry has been created
  
  ## Entry List (object)
  
  