tmenier/Flurl Flurl.Http.2.0 on GitHub

This is big. See #205 for details and motivations.

Aggressive reuse of HttpClient (single instance per host) by default when not managing FlurlClient explicitly (#144)
IFlurlClientFactory and FlurlClientFactoryBase allow for easily customizing caching/reuse strategy
Better IoC support with alternative IFlurlClientFactory implementation (#226)
ConnectionLeaseTimeout setting to deal with potential DNS issue (#222)
New FlurlRequest object implicitly created instead of FlurlClient in fluent expressions
Headers available at both request and client level (#157)
URL builder methods and request configuration methods (WithHeaders, etc) can be called in any order in fluent expressions (#211)
FlurlClient.Request method for fluently building a request off a client (#211)
FlurlClient.BaseUrl property to (optionally) build all requests off of (#211)
WithTimeout specific to a single request
Settings available on FlurlRequest, FlurlClient, HttpTest, and FlurlHttp (global) level, each inheriting defaults from a level up (#205 (comment))
Ability to fluently tweak request from BeforeCall / BeforeCallAsync (#213)
More robust FlurlHttpException.Message (#217)
New HttpTest assertions: WithHeader / WithoutHeader (#223)

All fluent extension methods on IFlurlClient moved to IFlurRequest, and all fluent extension methods on Url and string that previously returned IFlurlClient now return IFlurlRequest (Typical usages shouldn't break, but custom extensions should be updated to follow this new pattern)
FlurlClient.Url removed (superseded by FlurlRequest.Url)
FlurlClient.WithUrl removed (superseded by FlurlClient.Request)
FlurlClient.ConfigureClient renamed to FlurlClient.Configure
ConfigureClient extensions on IFlurlRequest, Url, and string replaced by ConfigureRequest
Url.ConfigureHttpClient removed
FlurlHttpSettings.DefaultTimeout replaced by FlurlHttpSettings.Timeout (like other settings, it's the "default" when defined at client or global level)
FlurlClient.Clone removed
Several FlurlClient constructors removed
FlurlHttpSettings.Clone removed
FlurlHttpSettings.AutoDispose removed (auto-dispose behavior no longer supported because short-lived clients is not a recommended practice)
IHttpClientFactory.CreateClient no longer takes a Url arg (more relevant to IFlurlClientFactory.Get, where caching strategy should be defined)
HttpCall.Url removed (superseded by HttpCall.FlurlRequest.Url
HttpCall.Settings removed (superseded by HttpCall.FlurlRequest.Settings
WithHeaders(object) converts underscores in property names to hyphens in header names by default (#44)

Cookies work correctly when HttpClientHandler is wrapped in DelegatingHandler (#202)
Reading response cookies is skipped when request fails (#208)

tmenier/Flurl Flurl.Http.2.0 Flurl.Http 2.0 on GitHub