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).
R6::R6Class object.
Middleware$new( process_request = function(request, response) TRUE, process_response = function(request, response) TRUE, id = "Middleware" )
process_request :: function
Modify request or response objects or throw exception using
[HTTPError] helper. This function evaluate before router handler called.
process_response :: function
Modify request or response objects or throw exception using
[HTTPError] helper. This function evaluate after router handler called.
id :: character(1)
Middleware id
process_request :: function
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 :: funciotn
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 :: character(1)
Middleware id