Add HTTP version configuration to GrpcChannelOptions (#2514)

Co-authored-by: Andrew Casey <[email protected]>

perf/benchmarkapps/GrpcClient/Program.cs

@@ -1,4 +1,4 @@
-#region Copyright notice and license
+#region Copyright notice and license
 
 // Copyright 2019 The gRPC Authors
 //
@@ -497,13 +497,14 @@ private static ChannelBase CreateChannel(string target)
 
                 HttpMessageHandler httpMessageHandler = httpClientHandler;
 
+                Version? versionOverride = null;
                 if (_options.Protocol == "h3")
                 {
                     // Stop gRPC channel from creating TCP socket.
                     httpClientHandler.ConnectCallback = (context, cancellationToken) => throw new InvalidOperationException("Should never be called for H3.");
 
                     // Force H3 on all requests.
-                    httpMessageHandler = new Http3DelegatingHandler(httpMessageHandler);
+                    versionOverride = new Version(3, 0);
                 }
 
                 return GrpcChannel.ForAddress(address, new GrpcChannelOptions
@@ -513,7 +514,8 @@ private static ChannelBase CreateChannel(string target)
 #else
                     HttpClient = new HttpClient(httpMessageHandler),
 #endif
-                    LoggerFactory = _loggerFactory
+                    LoggerFactory = _loggerFactory,
+                    HttpVersion = versionOverride
                 });
         }
     }
@@ -759,21 +761,4 @@ private static bool IsCallCountExceeded()
     {
         return _options.CallCount != null && _callsStarted > _options.CallCount;
     }
-
-    private class Http3DelegatingHandler : DelegatingHandler
-    {
-        private static readonly Version Http3Version = new Version(3, 0);
-
-        public Http3DelegatingHandler(HttpMessageHandler innerHandler)
-        {
-            InnerHandler = innerHandler;
-        }
-
-        protected override Task<HttpResponseMessage> SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
-        {
-            request.Version = Http3Version;
-            request.VersionPolicy = HttpVersionPolicy.RequestVersionExact;
-            return base.SendAsync(request, cancellationToken);
-        }
-    }
 }

src/Grpc.Net.Client.Web/GrpcWebHandler.cs

@@ -1,4 +1,4 @@
-#region Copyright notice and license
+#region Copyright notice and license
 
 // Copyright 2019 The gRPC Authors
 //
@@ -44,6 +44,11 @@ public sealed class GrpcWebHandler : DelegatingHandler
     /// be overridden.
     /// </para>
     /// </summary>
+#if NET5_0_OR_GREATER
+    [Obsolete("HttpVersion is obsolete and will be removed in a future release. Use GrpcChannelOptions.HttpVersion and GrpcChannelOptions.HttpVersionPolicy instead.")]
+#else
+    [Obsolete("HttpVersion is obsolete and will be removed in a future release. Use GrpcChannelOptions.HttpVersion instead.")]
+#endif
     public Version? HttpVersion { get; set; }
 
     /// <summary>
@@ -136,22 +141,27 @@ private async Task<HttpResponseMessage> SendAsyncCore(HttpRequestMessage request
         // https://github.com/mono/mono/issues/18718
         request.SetOption(WebAssemblyEnableStreamingResponseKey, true);
 
+#pragma warning disable CS0618 // Type or member is obsolete
         if (HttpVersion != null)
         {
             // This doesn't guarantee that the specified version is used. Some handlers will ignore it.
             // For example, version in the browser always negotiated by the browser and HttpClient
             // uses what the browser has negotiated.
             request.Version = HttpVersion;
+#if NET5_0_OR_GREATER
+            request.VersionPolicy = HttpVersionPolicy.RequestVersionOrHigher;
+#endif
         }
+#pragma warning restore CS0618 // Type or member is obsolete
 #if NET5_0_OR_GREATER
         else if (request.RequestUri?.Scheme == Uri.UriSchemeHttps
-            && request.VersionPolicy == HttpVersionPolicy.RequestVersionOrHigher
+            && request.VersionPolicy == HttpVersionPolicy.RequestVersionExact
             && request.Version == System.Net.HttpVersion.Version20)
         {
-            // If no explicit HttpVersion is set and the request is using TLS then default to HTTP/1.1.
-            // HTTP/1.1 together with HttpVersionPolicy.RequestVersionOrHigher it will be compatible
-            // with all endpoints.
-            request.Version = System.Net.HttpVersion.Version11;
+            // If no explicit HttpVersion is set and the request is using TLS then change the version policy
+            // to allow for HTTP/1.1. HttpVersionPolicy.RequestVersionOrLower it will be compatible
+            // with HTTP/1.1 and HTTP/2.
+            request.VersionPolicy = HttpVersionPolicy.RequestVersionOrLower;
         }
 #endif
 #if NETSTANDARD2_0

src/Grpc.Net.Client/GrpcChannel.cs

@@ -79,6 +79,10 @@ public sealed class GrpcChannel : ChannelBase, IDisposable
     internal Dictionary<string, ICompressionProvider> CompressionProviders { get; }
     internal string MessageAcceptEncoding { get; }
     internal bool Disposed { get; private set; }
+    internal Version HttpVersion { get; }
+#if NET5_0_OR_GREATER
+    internal HttpVersionPolicy HttpVersionPolicy { get; }
+#endif
 
 #if SUPPORT_LOAD_BALANCING
     // Load balancing
@@ -175,6 +179,10 @@ internal GrpcChannel(Uri address, GrpcChannelOptions channelOptions) : base(addr
             RetryThrottling = serviceConfig.RetryThrottling != null ? CreateChannelRetryThrottling(serviceConfig.RetryThrottling) : null;
             _serviceConfigMethods = CreateServiceConfigMethods(serviceConfig);
         }
+        HttpVersion = channelOptions.HttpVersion ?? GrpcProtocolConstants.Http2Version;
+#if NET5_0_OR_GREATER
+        HttpVersionPolicy = channelOptions.HttpVersionPolicy ?? HttpVersionPolicy.RequestVersionExact;
+#endif
 
         // Non-HTTP addresses (e.g. dns:///custom-hostname) usually specify a path instead of an authority.
         // Only log about a path being present if HTTP or HTTPS.

src/Grpc.Net.Client/GrpcChannelOptions.cs

@@ -1,4 +1,4 @@
-#region Copyright notice and license
+#region Copyright notice and license
 
 // Copyright 2019 The gRPC Authors
 //
@@ -287,6 +287,35 @@ public TimeSpan InitialReconnectBackoff
     /// </summary>
     public IServiceProvider? ServiceProvider { get; set; }
 
+    /// <summary>
+    /// Gets or sets the HTTP version to use when making gRPC calls.
+    /// <para>
+    /// When a <see cref="Version"/> is specified the value will be set on <see cref="HttpRequestMessage.Version"/>
+    /// as gRPC calls are made. Changing this property allows the HTTP version of gRPC calls to
+    /// be overridden.
+    /// </para>
+    /// <para>
+    /// A <c>null</c> value doesn't override the HTTP version of gRPC calls. Defaults to <c>2.0</c>.
+    /// </para>
+    /// </summary>
+    public Version? HttpVersion { get; set; }
+
+#if NET5_0_OR_GREATER
+    /// <summary>
+    /// Gets or sets the HTTP policy to use when making gRPC calls.
+    /// <para>
+    /// When a <see cref="HttpVersionPolicy"/> is specified the value will be set on <see cref="HttpRequestMessage.VersionPolicy"/>
+    /// as gRPC calls are made. The policy determines how <see cref="Version"/> is interpreted when
+    /// the final HTTP version is negotiated with the server. Changing this property allows the HTTP
+    /// version of gRPC calls to be overridden.
+    /// </para>
+    /// <para>
+    /// A <c>null</c> value doesn't override the HTTP policy of gRPC calls. Defaults to <see cref="HttpVersionPolicy.RequestVersionExact"/>.
+    /// </para>
+    /// </summary>
+    public HttpVersionPolicy? HttpVersionPolicy { get; set; }
+#endif
+
     internal T ResolveService<T>(T defaultValue)
     {
         return (T?)ServiceProvider?.GetService(typeof(T)) ?? defaultValue;

src/Grpc.Net.Client/Internal/GrpcCall.cs

@@ -957,9 +957,9 @@ private void SetWriter(HttpRequestMessage message, HttpContentClientStreamWriter
     private HttpRequestMessage CreateHttpRequestMessage(TimeSpan? timeout)
     {
         var message = new HttpRequestMessage(HttpMethod.Post, _grpcMethodInfo.CallUri);
-        message.Version = GrpcProtocolConstants.Http2Version;
+        message.Version = Channel.HttpVersion;
 #if NET5_0_OR_GREATER
-        message.VersionPolicy = HttpVersionPolicy.RequestVersionOrHigher;
+        message.VersionPolicy = Channel.HttpVersionPolicy;
 #endif
 
         // Set raw headers on request using name/values. Typed headers allocate additional objects.

test/FunctionalTests/Balancer/ConnectionTests.cs

@@ -322,7 +322,7 @@ async Task<HelloReply> UnaryMethod(HelloRequest request, ServerCallContext conte
         var client = TestClientFactory.Create(channel, endpoint1.Method);
 
         // Act
-        grpcWebHandler.HttpVersion = new Version(1, 1);
+        SetHandlerHttpVersion(grpcWebHandler, new Version(1, 1));
         var http11CallTasks = new List<Task<HelloReply>>();
         for (int i = 0; i < 10; i++)
         {
@@ -352,7 +352,7 @@ await TestHelpers.AssertIsTrueRetryAsync(() =>
         }
 
         // Act
-        grpcWebHandler.HttpVersion = new Version(2, 0);
+        SetHandlerHttpVersion(grpcWebHandler, new Version(2, 0));
         var http2CallTasks = new List<Task<HelloReply>>();
         for (int i = 0; i < 10; i++)
         {
@@ -389,7 +389,7 @@ await TestHelpers.AssertIsTrueRetryAsync(() =>
             return activeStreams.Count == 10;
         }, "Wait for HTTP/2 connection to end.");
 
-        grpcWebHandler.HttpVersion = new Version(1, 1);
+        SetHandlerHttpVersion(grpcWebHandler, new Version(1, 1));
 
         await Task.Delay(1000);
 
@@ -412,6 +412,13 @@ await TestHelpers.AssertIsTrueRetryAsync(() =>
         Assert.AreEqual(new DnsEndPoint("127.0.0.1", endpoint2.Address.Port), activeStreams[0].EndPoint);
     }
 
+    private static void SetHandlerHttpVersion(GrpcWebHandler handler, Version version)
+    {
+#pragma warning disable CS0618 // Type or member is obsolete
+        handler.HttpVersion = version;
+#pragma warning restore CS0618 // Type or member is obsolete
+    }
+
 #if NET7_0_OR_GREATER
     [Test]
     public async Task Active_UnaryCall_HostOverride_Success()

test/FunctionalTests/Balancer/PickFirstBalancerTests.cs

@@ -47,21 +47,6 @@ namespace Grpc.AspNetCore.FunctionalTests.Balancer;
 [TestFixture]
 public class PickFirstBalancerTests : FunctionalTestBase
 {
-    private GrpcChannel CreateGrpcWebChannel(TestServerEndpointName endpointName, Version? version)
-    {
-        var grpcWebHandler = new GrpcWebHandler(GrpcWebMode.GrpcWeb);
-        grpcWebHandler.HttpVersion = version;
-
-        var httpClient = Fixture.CreateClient(endpointName, grpcWebHandler);
-        var channel = GrpcChannel.ForAddress(httpClient.BaseAddress!, new GrpcChannelOptions
-        {
-            HttpClient = httpClient,
-            LoggerFactory = LoggerFactory
-        });
-
-        return channel;
-    }
-
     [Test]
     public async Task UnaryCall_CallAfterConnectionTimeout_Success()
     {

test/FunctionalTests/Client/ClientFactoryTests.cs

@@ -104,7 +104,11 @@ Task<HelloReply> UnaryCall(HelloRequest request, ServerCallContext context)
             {
                 return TestClientFactory.Create(invoker, method);
             })
-            .AddHttpMessageHandler(() => new Http3Handler())
+            .ConfigureChannel(options =>
+            {
+                options.HttpVersion = HttpVersion.Version30;
+                options.HttpVersionPolicy = HttpVersionPolicy.RequestVersionExact;
+            })
             .ConfigurePrimaryHttpMessageHandler(() =>
             {
                 return new SocketsHttpHandler
@@ -125,20 +129,5 @@ Task<HelloReply> UnaryCall(HelloRequest request, ServerCallContext context)
         // Assert
         Assert.AreEqual("Hello world", response1.Message);
     }
-
-    private class Http3Handler : DelegatingHandler
-    {
-        public Http3Handler() { }
-        public Http3Handler(HttpMessageHandler innerHandler) : base(innerHandler) { }
-
-        protected override Task<HttpResponseMessage> SendAsync(
-            HttpRequestMessage request, CancellationToken cancellationToken)
-        {
-            request.Version = HttpVersion.Version30;
-            request.VersionPolicy = HttpVersionPolicy.RequestVersionExact;
-
-            return base.SendAsync(request, cancellationToken);
-        }
-    }
 #endif
 }

test/FunctionalTests/Infrastructure/GrpcHttpHelper.cs

@@ -1,4 +1,4 @@
-#region Copyright notice and license
+#region Copyright notice and license
 
 // Copyright 2019 The gRPC Authors
 //
@@ -16,7 +16,6 @@
 
 #endregion
 
-
 namespace Grpc.AspNetCore.FunctionalTests.Infrastructure;
 
 public static class GrpcHttpHelper
@@ -26,7 +25,7 @@ public static HttpRequestMessage Create(string url, HttpMethod? method = null)
         var request = new HttpRequestMessage(method ?? HttpMethod.Post, url);
         request.Version = new Version(2, 0);
 #if NET5_0_OR_GREATER
-        request.VersionPolicy = HttpVersionPolicy.RequestVersionOrHigher;
+        request.VersionPolicy = HttpVersionPolicy.RequestVersionExact;
 #endif
 
         return request;