Owin and Katana

First, OWIN

Second, Katana

Third, middleware middleware

First, OWIN

1,owin Introduction

Owin is open Web Server Interface for. NET acronym. Owin defines a standard set of interfaces between. Net Web server and Web application. The Owin target is used to decouple the Web server from the Web application. Owin is just a contract, a specification, not a code implementation (katana implements the Owin)

2,owin specification

1) Owin defines the host, Server, middleware, application four layers

①host: Primarily responsible for application configuration and startup processes, including initialization of Owin Pipeline (pipelines, including middleware), running server

②server: Binds the socket and listens for HTTP requests, and then encapsulates the body and header of the request and response into a dictionary that conforms to the Owin specification and is sent to the Owin middleware pipeline for processing

②middleware: Middleware, component, between server and application for processing requests sent to pipeline

④application: Specific application code

2) Application Delegate (application delegate) for server-to-middleware interaction. He is not a strict interface, but a delegate and each Owin middleware component must provide.

3) Environment Dictionary (Environment Dictionary), encapsulation of HTTP requests

Request data:

Required	Key Name	Value Description
Yes	"Owin. Requestbody "	The request body. Stream type
Yes	"Owin. Requestheaders "	The request header. idictionary<string, string[]> type
Yes	"Owin. Requestmethod "	A string that contains the requested HTTP request method (for example, "GET", "POST").
Yes	"Owin. Requestpath "	A string that contains the request path. The path must be relative to the "root" of the application delegate.
Yes	"Owin. Requestpathbase "	A string containing the request path part corresponding to the "root" of the application delegate
Yes	"Owin. Requestprotocol "	A string that contains the protocol name and version (for example, "http/1.0" or "http/1.1").
Yes	"Owin. Requestquerystring "	String containing the query string component of the HTTP request URI, with no preamble "? (For example, "foo = Bar&baz = Quux"). The value may be an empty string.
Yes	"Owin. Requestscheme "	String containing the URI scheme for the request (for example, "http", "https")

Response data:

Required	Key Name	Value Description
Yes	"Owin. Responsebody "	The response body. Stream type
Yes	"Owin. Responseheaders "	The response header. idictionary<string, string[]> type
No	"Owin. Responsestatuscode "	An optional option that contains the HTTP response status code defined in RFC 2616 section 6.1.1. The default value is 200.
No	"Owin. Responsereasonphrase "	An optional string that contains the reason phrase is associated with the given status code. If not provided, the server should provide default values as specified in RFC 2616, section 6.1.1
No	"Owin. Responseprotocol "	An optional string that contains the protocol name and version (for example, "http/1.0" or "http/1.1"). If not provided, then "Owin. The value of the Requestprotocol "key is the default value.

Other data:

Required	Key Name	Value Description
Yes	"Owin. Callcancelled "	Indicates whether the request was canceled/aborted
Yes	"Owin. Version "	Represents the Owin version of the string "1.0"

Second, Katana

Third, middleware middleware

Owin and Katana