• Using Polly with HttpClient factory from ASPNET Core 2.1 onwards
• What is HttpClient factory?
• Using Polly with IHttpClientFactory
• Step 1 Reference the ASPNET Core 2.1 (or later) packages and Microsoft.Extensions.Http.Polly
• Step 2 Configure a client with Polly policies, in Startup
• Define a named HttpClient configuration
• Fluently extend that client configuration with Polly policies
• Step 3 Consume the configured HttpClient
• How are the Polly policies applied?
• Configuring the Polly policies
• Using .AddTransientHttpErrorPolicy(...)
• Using any policy configured via the traditional Polly syntax
• Extending the convenience .AddTransientHttpErrorPolicy(...) definition
• Applying multiple policies
• What order are multiple policies applied in?
• How does this compare to PolicyWrap?
• Combining PolicyHttpMessageHandler with other DelegatingHandlers
• Selecting policies dynamically
• With stateful policies, use as selector, not factory
• Selecting policies from a PolicyRegistry
• Using a GetOrAdd(...)-style approach on PolicyRegistry
• Use Case: Applying timeouts
• If you configure TimeoutPolicy outside RetryPolicy
• Use Case: scoping CircuitBreakers and Bulkheads
• Use Case: CachePolicy
• Is caching at the HttpResponseMessage level the right fit?
• Considerations when caching HttpResponseMessage
• Use Case: Exchanging information between policy execution and calling code
• Configuring policies to use services registered with DI, such as ILogger<T>
• Configuring HttpClientFactory policies to use an ILogger<T> from the call site