private static HttpHandlerContext CalculateHandlerContext(GrpcChannelOptions channelOptions)
{
if (channelOptions.HttpHandler == null)
{
// No way to know what handler a HttpClient is using so assume custom.
var type = channelOptions.HttpClient == null
? HttpHandlerType.SocketsHttpHandler
: HttpHandlerType.Custom;
return(new HttpHandlerContext(type));
}
if (HttpRequestHelpers.HasHttpHandlerType(channelOptions.HttpHandler, "System.Net.Http.WinHttpHandler"))
{
return(new HttpHandlerContext(HttpHandlerType.WinHttpHandler));
}
if (HttpRequestHelpers.HasHttpHandlerType(channelOptions.HttpHandler, "System.Net.Http.SocketsHttpHandler"))
{
HttpHandlerType type;
TimeSpan? connectTimeout;
#if NET5_0_OR_GREATER
var socketsHttpHandler = HttpRequestHelpers.GetHttpHandlerType <SocketsHttpHandler>(channelOptions.HttpHandler) !;
type = HttpHandlerType.SocketsHttpHandler;
connectTimeout = socketsHttpHandler.ConnectTimeout;
// Check if the SocketsHttpHandler is being shared by channels.
// It has already been setup by another channel (i.e. ConnectCallback is set) then
// additional channels can use advanced connectivity features.
if (!BalancerHttpHandler.IsSocketsHttpHandlerSetup(socketsHttpHandler))
{
// Someone has already configured the handler callback.
// This channel can't support advanced connectivity features.
if (socketsHttpHandler.ConnectCallback != null)
{
type = HttpHandlerType.Custom;
connectTimeout = null;
}
}
#else
type = HttpHandlerType.SocketsHttpHandler;
connectTimeout = null;
#endif
return(new HttpHandlerContext(type, connectTimeout));
}
if (HttpRequestHelpers.GetHttpHandlerType <HttpClientHandler>(channelOptions.HttpHandler) != null)
{
return(new HttpHandlerContext(HttpHandlerType.HttpClientHandler));
}
return(new HttpHandlerContext(HttpHandlerType.Custom));
}
private bool Http2NotSupported()
{
if (Environment.Version.Major == 4 &&
Environment.Version.Minor == 0 &&
Environment.Version.Build == 30319 &&
InnerHandler != null &&
HttpRequestHelpers.HasHttpHandlerType <HttpClientHandler>(InnerHandler))
{
// https://docs.microsoft.com/dotnet/api/system.environment.version#remarks
// Detect runtimes between .NET 4.5 and .NET Core 2.1
// The default HttpClientHandler doesn't support HTTP/2.
return(true);
}
return(false);
}
