Web API HTTP Pipeline

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Objectives • Understand the client-side and server-side pipelines • Send the best HTTP responses for Web API operations • Use the HTTP pipeline objects to handle exceptions • Write your own custom handlers for Web API requests Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company

Agenda • • • • • •

Pipeline Elements Client-Side Pipeline Server-Side Pipeline Improving CRUD Responses Exception Handling Custom Handlers

Pipeline Elements • • • • •

Request/Response models have pipelines Composed of sequential events that fire Uses specific objects Web API has client and server-side pipelines Both share some common objects

HttpRequestMessage • Represents all the info about the HTTP request • URL • HTTP method • Headers

HttpResponseMessage • Represents all the info about the HTTP response • Status code • Success flag • Original HTTP request

HttpMessageHandler • Base class implemented by other objects • Most custom processing code goes here • Able to write custom handlers and put them in the pipeline

Agenda • • • • • •

Pipeline Elements Client-Side Pipeline Server-Side Pipeline Improving CRUD Responses Exception Handling Custom Handlers

Client-Side Pipeline • • • •

HttpClient sends requests Request is an HttpRequestMessage Request is sent to HttpMessageHandler HttpMessageHandler returns HttpResponseMessage • Default handler is HttpClientHandler

Client-Side Pipeline

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Agenda • • • • • •

Pipeline Elements Client-Side Pipeline Server-Side Pipeline Improving CRUD Responses Exception Handling Custom Handlers

Server-Side Pipeline • Web host gives the request to HttpServer • Request passed through series of HttpMessageHandlers • Ends with HttpControllerDispatcher • Dispatcher sends request to appropriate Controller which sends response

Agenda • • • • • •

Pipeline Elements Client-Side Pipeline Server-Side Pipeline Improving CRUD Responses Exception Handling Custom Handlers

Improving CRUD Responses • By default, Web API always sends same HTTP response code • Can alter the response to include more accurate info

Improving CRUD Responses Let’s improve a Web API service’s HTTP responses!

Agenda • • • • • •

Pipeline Elements Client-Side Pipeline Server-Side Pipeline Improving CRUD Responses Exception Handling Custom Handlers

Exception Handling • Exceptions tend to be vague on client • HttpResponseException • Can use filters to assign HTTP responses

Exception Handling Letâ&#x20AC;&#x2122;s set up an automated way to send better error messages to the client

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Agenda • • • • • •

Pipeline Elements Client-Side Pipeline Server-Side Pipeline Improving CRUD Responses Exception Handling Custom Handlers

Custom Handlers • Inherit DelegatingHandler • Custom code to perform any kind of per request functionality • Logging • Security • Handling certain kinds of requests

Custom Handlers Weâ&#x20AC;&#x2122;ll add some security to a Web API service

Learn More @ http://www.learnnowonline.com Copyright ÂŠ by Application Developers Training Company

Learn More! • This is an excerpt from a larger course. Visit www.learnnowonline.com for the full details! • Learn more about Web API on SlideShare:  Web API Basics

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