HttpClient and HttpClient factory demo

To access the demos, checkout the respective tag.

git checkout tags/single-use-httpclient --force --quiet

The demo accesses https://bing.com/ and https://api.github.com/. Due to the high intensity of the requests, those websites might (they will!) throttle the requests.

To monitor for TIME_WAIT connections to these destinations, use the following PowerShell command:

while ($true) { (Get-NetTCPConnection -RemoteAddress '13.107.21.200','204.79.197.200','140.82.118.6' -State TimeWait -ErrorAction Ignore).Count } 

Single use HttpClient

tag: single-use-httpclient

This demo uses a new instance of HttpClient each time it's used.

Single use HttpClient with connection close

tag: single-use-httpclient-connection-close

This demo uses a new instance of HttpClient each time it's used with ConnectionClose set to true.

Singleton HttpClient

tag: single-use-httpclient-connection-close

This demo uses a singleton instance of HttpClient for every use.

Single use HttpClient with singleton HttpClientHandler

tag: single-use-httpclient-singleton-httpclienthandler

This demo uses a singleton instance of HttpClientHandler in instances of HttpClient for one-time use.

Use HttpClient factory

tag: httpclientfactory

This demo uses the implmentation of IHttpHandlerFactory to create instances of HttpClient for one-time use.

Use HttpClient factory with named clients

tag: httpclientfactory-named-httpclient

This demo uses the implmentation of IHttpHandlerFactory to create instances of HttpClient for one-time use using named definitions.

Use HttpClient factory with typed clients

tag: httpclientfactory-typed-client

This demo uses the implmentation of IHttpHandlerFactory to create instances of HttpClient for one-time use using typed clients.

Use HttpClient factory with custom primary handler

tag: httpclientfactory-socketshttphandler

This demo uses the implmentation of IHttpHandlerFactory to create instances of HttpClient for one-time use using a custom primary handler (SocketsHttpHandler).

Use HttpClient factory with policies

tag: httpclientfactory-polly

This demo uses the implmentation of IHttpHandlerFactory to create instances of HttpClient for one-time use using policies provided by Polly.

Resources

• TIME_WAIT
  • Troubleshoot port exhaustion issues
  • TCP TIME_WAIT and TIME_WAIT assassination
• HttpClient class
  • Documentation
  • Browse source code
• SocketsHttpHandler Class
  • Documentation
  • Browse source code
• Make HTTP requests usingIHttpClientFactoryin ASP.NET Core
• Use IHttpClientFactory to implement resilient HTTP requests
• IHttpClientFactoryinterface
  • Documentation
  • Browse source code
• HttpClientBuilderExtensions Class
  • Documentation
  • Browse source code
• Steve Gordon's blog posts on HttpClient [GitHub] [Twitter]
  • HttpClient Creation And Disposal Internals: Should I Dispose Of HttpClient ?
  • Demystifying HttpClient Internals: SendAsync Flow For HttpRequestMessage
  • Demystifying HttpClient Internals: HttpResponseMessage
  • HttpClient Connection Pooling in .NET Core
  • Using HttpCompletionOption To Improve HttpClient Performance In .NET
  • Sending And Receiving JSON Using HttpClient With System.Net.Http.Json
• Steve Gordon's blog posts on IHttpClientFactory [GitHub] [Twitter]
  • HttpClientFactory in ASP.NET Core 2.1 (Part 1): An Introduction To HttpClientFactory
  • HttpClientFactory In ASP.NET Core 2.1 (Part 2): Defining Named And Typed Clients
  • HttpClientFactory In ASP.NET Core 2.1 (Part 3): Outgoing Request Middleware With Handlers
  • HttpClientFactory In ASP.NET Core 2.1 (Part 4): Integrating With Polly For Transient Fault Handling
  • IHttpClientFactory Patterns: Using Typed Clients From Singleton Services
  • HttpClientFactory In ASP.NET Core 2.1 (Part 5): Logging
• Andrew Lock's blog posts on IHttpClientFactory [GitHub] [Twitter]
  • Exploring the code behind IHttpClientFactory in depth
  • DI scopes in IHttpClientFactory message handlers don't work like you think they do
• Damen Bod’s blog posts on HttpClient/IHttpClientFactory [GitHub] [Twitter]
  • Using Certificate Authentication With IHttpClientFactory and HttpClient
• João Grassi [GitHub] [Twitter]
  • Encapsulating getting access tokens from IdentityServer with a typed HttpClient and MessageHandler