When the mode interface calls Tornado executive order

Interface calls the order of Tornado

initialize()

• Role: to do some initialization

prepare()

• Action: pretreatment, before performing the corresponding method invocation request
• NOTE: Any HTTP request, the method will be executed prepare

http method:

• get: high speed and efficiency, a small amount of data shortcomings unsafe
• post: request data in the request body, the amount of data, security
• put: the specified server from the client to transfer content
• delete: a request to delete the specified number of server resources
• head: Similarly get request, but no response to the specific content, the user acquires header
• patch: a request to modify the data content of local
• options: http method returns all supported url

set_default_headers()

write_error()

on_finish()：

• Role: After the call request processing, release resources to clean up the process, or log processing
• NOTE: Do not try this process in response to the output

order:

• Under normal circumstances did not run out in the wrong order:
  • set_default_headers: Set head
  • initialize: initialize
  • prepare: pretreatment (similar role django middleware)
  • HTTP method (get, post ....)
  • on_finish: after the end of treatment response
• Ran out of order under the exception error situation:
  • set_default_headers
  • initialize
  • prepare
  • http
  • set_default_headers: this error message because the error response, you need to modify the header
  • write_error: rewrite error message
  • on_finish: After releasing the memory in response to do, log processing operations