Understand the client-side and server-side Web API HTTP Pipelines.

1. Web API HTTP Pipeline
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2. Objectives
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3. Objectives
• Understand the client-side and server-
side pipelines
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4. Objectives
• Understand the client-side and server-
side pipelines
• Send the best HTTP responses for Web
API operations
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5. 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
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6. 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
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7. Agenda
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8. Agenda
• Pipeline Elements
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9. Agenda
• Pipeline Elements
• Client-Side Pipeline
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10. Agenda
• Pipeline Elements
• Client-Side Pipeline
• Server-Side Pipeline
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11. Agenda
• Pipeline Elements
• Client-Side Pipeline
• Server-Side Pipeline
• Improving CRUD Responses
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12. Agenda
• Pipeline Elements
• Client-Side Pipeline
• Server-Side Pipeline
• Improving CRUD Responses
• Exception Handling
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13. Agenda
• Pipeline Elements
• Client-Side Pipeline
• Server-Side Pipeline
• Improving CRUD Responses
• Exception Handling
• Custom Handlers
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14. Pipeline Elements
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15. Pipeline Elements
• Request/Response models have
pipelines
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16. Pipeline Elements
• Request/Response models have
pipelines
• Composed of sequential events that
fire
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17. Pipeline Elements
• Request/Response models have
pipelines
• Composed of sequential events that
fire
• Uses specific objects
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18. Pipeline Elements
• Request/Response models have
pipelines
• Composed of sequential events that
fire
• Uses specific objects
• Web API has client and server-side
pipelines
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19. HttpRequestMessage
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20. HttpRequestMessage
• Represents all the info about the HTTP
request
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21. HttpRequestMessage
• Represents all the info about the HTTP
request
• URL
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22. HttpRequestMessage
• Represents all the info about the HTTP
request
• URL
• HTTP method
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23. HttpRequestMessage
• Represents all the info about the HTTP
request
• URL
• HTTP method
• Headers
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24. HttpResponseMessage
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25. HttpResponseMessage
• Represents all the info about the HTTP
response
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26. HttpResponseMessage
• Represents all the info about the HTTP
response
• Status code
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27. HttpResponseMessage
• Represents all the info about the HTTP
response
• Status code
• Success flag
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28. HttpResponseMessage
• Represents all the info about the HTTP
response
• Status code
• Success flag
• Original HTTP request
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29. HttpMessageHandler
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30. HttpMessageHandler
• Base class implemented by other
objects
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31. HttpMessageHandler
• Base class implemented by other
objects
• Most custom processing code goes
here
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32. HttpMessageHandler
• Base class implemented by other
objects
• Most custom processing code goes
here
• Able to write custom handlers and put
them in the pipeline
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33. Agenda
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34. Agenda
• Pipeline Elements
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35. Agenda
• Pipeline Elements
• Client-Side Pipeline
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36. Agenda
• Pipeline Elements
• Client-Side Pipeline
• Server-Side Pipeline
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37. Agenda
• Pipeline Elements
• Client-Side Pipeline
• Server-Side Pipeline
• Improving CRUD Responses
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38. Agenda
• Pipeline Elements
• Client-Side Pipeline
• Server-Side Pipeline
• Improving CRUD Responses
• Exception Handling
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39. Agenda
• Pipeline Elements
• Client-Side Pipeline
• Server-Side Pipeline
• Improving CRUD Responses
• Exception Handling
• Custom Handlers
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40. Client-Side Pipeline
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41. Client-Side Pipeline
• HttpClient sends requests
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42. Client-Side Pipeline
• HttpClient sends requests
• Request is an HttpRequestMessage
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43. Client-Side Pipeline
• HttpClient sends requests
• Request is an HttpRequestMessage
• Request is sent to HttpMessageHandler
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44. Client-Side Pipeline
• HttpClient sends requests
• Request is an HttpRequestMessage
• Request is sent to HttpMessageHandler
• HttpMessageHandler returns
HttpResponseMessage
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45. Client-Side Pipeline
• HttpClient sends requests
• Request is an HttpRequestMessage
• Request is sent to HttpMessageHandler
• HttpMessageHandler returns
HttpResponseMessage
• Default handler is HttpClientHandler
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46. Client-Side Pipeline
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47. Agenda
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48. Agenda
• Pipeline Elements
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49. Agenda
• Pipeline Elements
• Client-Side Pipeline
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50. Agenda
• Pipeline Elements
• Client-Side Pipeline
• Server-Side Pipeline
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51. Agenda
• Pipeline Elements
• Client-Side Pipeline
• Server-Side Pipeline
• Improving CRUD Responses
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52. Agenda
• Pipeline Elements
• Client-Side Pipeline
• Server-Side Pipeline
• Improving CRUD Responses
• Exception Handling
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53. Agenda
• Pipeline Elements
• Client-Side Pipeline
• Server-Side Pipeline
• Improving CRUD Responses
• Exception Handling
• Custom Handlers
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54. Server-Side Pipeline
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55. Server-Side Pipeline
• Web host gives the request to
HttpServer
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56. Server-Side Pipeline
• Web host gives the request to
HttpServer
• Request passed through series of
HttpMessageHandlers
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57. Server-Side Pipeline
• Web host gives the request to
HttpServer
• Request passed through series of
HttpMessageHandlers
• Ends with HttpControllerDispatcher
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58. 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
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59. Agenda
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60. Agenda
• Pipeline Elements
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61. Agenda
• Pipeline Elements
• Client-Side Pipeline
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62. Agenda
• Pipeline Elements
• Client-Side Pipeline
• Server-Side Pipeline
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63. Agenda
• Pipeline Elements
• Client-Side Pipeline
• Server-Side Pipeline
• Improving CRUD Responses
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64. Agenda
• Pipeline Elements
• Client-Side Pipeline
• Server-Side Pipeline
• Improving CRUD Responses
• Exception Handling
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65. Agenda
• Pipeline Elements
• Client-Side Pipeline
• Server-Side Pipeline
• Improving CRUD Responses
• Exception Handling
• Custom Handlers
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66. Improving CRUD Responses
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67. Improving CRUD Responses
• By default, Web API always sends same
HTTP response code
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68. Improving CRUD Responses
• By default, Web API always sends same
HTTP response code
• Can alter the response to include more
accurate info
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69. Improving CRUD Responses
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70. Improving CRUD Responses
Let’s improve a Web API service’s HTTP
responses!
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71. Agenda
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72. Agenda
• Pipeline Elements
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73. Agenda
• Pipeline Elements
• Client-Side Pipeline
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74. Agenda
• Pipeline Elements
• Client-Side Pipeline
• Server-Side Pipeline
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75. Agenda
• Pipeline Elements
• Client-Side Pipeline
• Server-Side Pipeline
• Improving CRUD Responses
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76. Agenda
• Pipeline Elements
• Client-Side Pipeline
• Server-Side Pipeline
• Improving CRUD Responses
• Exception Handling
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77. Agenda
• Pipeline Elements
• Client-Side Pipeline
• Server-Side Pipeline
• Improving CRUD Responses
• Exception Handling
• Custom Handlers
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78. Exception Handling
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79. Exception Handling
• Exceptions tend to be vague on client
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80. Exception Handling
• Exceptions tend to be vague on client
• HttpResponseException
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81. Exception Handling
• Exceptions tend to be vague on client
• HttpResponseException
• Can use filters to assign HTTP
responses
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82. Exception Handling
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83. Exception Handling
Let’s set up an automated way to send
better error messages to the client
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84. Agenda
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85. Agenda
• Pipeline Elements
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86. Agenda
• Pipeline Elements
• Client-Side Pipeline
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87. Agenda
• Pipeline Elements
• Client-Side Pipeline
• Server-Side Pipeline
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88. Agenda
• Pipeline Elements
• Client-Side Pipeline
• Server-Side Pipeline
• Improving CRUD Responses
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89. Agenda
• Pipeline Elements
• Client-Side Pipeline
• Server-Side Pipeline
• Improving CRUD Responses
• Exception Handling
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90. Agenda
• Pipeline Elements
• Client-Side Pipeline
• Server-Side Pipeline
• Improving CRUD Responses
• Exception Handling
• Custom Handlers
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91. Custom Handlers
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92. Custom Handlers
• Inherit DelegatingHandler
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93. Custom Handlers
• Inherit DelegatingHandler
• Custom code to perform any kind of
per request functionality
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94. Custom Handlers
• Inherit DelegatingHandler
• Custom code to perform any kind of
per request functionality
• Logging
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95. Custom Handlers
• Inherit DelegatingHandler
• Custom code to perform any kind of
per request functionality
• Logging
• Security
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96. Custom Handlers
• Inherit DelegatingHandler
• Custom code to perform any kind of
per request functionality
• Logging
• Security
• Handling certain kinds of requests
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97. Custom Handlers
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98. Custom Handlers
We’ll add some security to a Web API
service
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99. Learn More!
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100. Learn More!
• This is an excerpt from a larger course. Visit
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101. Learn More!
• This is an excerpt from a larger course. Visit
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102. 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:
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103. Learn More!
• This is an excerpt from a larger course. Visit
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• Learn more about Web API on SlideShare:
 Web API Basics
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