Middleware function

Creates middleware object

Creates Middleware object.

Middleware is a very useful concept which allows to perform preprocessing of requests and post-processing of responses. Middleware has an access to both request and response objects and can modify them. This way each request can be checked/modified before passing handler and response can be post processed (for example this way we developer can set up custom error messages).

See Also

Request Response Application

Public fields

• process_request: Function which takes 2 arguments - request and response objects (class Request and Response correspondingly) and modify request and response or throw exception using HTTPError helper.

   Function is called before request is routed to handler.
   
   Usually `process_request` is used to perform logging, check authorization, etc.
  

• process_response: Function which takes 2 arguments - request and response objects (class Request and Response correspondingly) and modify request and response or throw exception using HTTPError helper.

   Function is called after request is processed by handler. Usually `process_response` is used to perform logging, custom error handling, etc.
  

• id: Middleware id.

Methods

Public methods

• list("Middleware$new()")

• list("Middleware$clone()")

Method new()

Creates middleware object

Usage

Middleware$new(
  process_request = function(request, response) TRUE,
  process_response = function(request, response) TRUE,
  id = "Middleware"
)

Arguments

• process_request: Modify request or response objects or throw exception using [HTTPError] helper. This function evaluate before router handler called.

• process_response: Modify request or response objects or throw exception using [HTTPError] helper. This function evaluate after router handler called.

• id: Middleware id.

Method clone()

The objects of this class are cloneable with this method.

Usage

Middleware$clone(deep = FALSE)

Arguments

• deep: Whether to make a deep clone.