Add client-side Streamable HTTP transport support (#356)

tests/ModelContextProtocol.AspNetCore.Tests/StreamableHttpServerIntegrationTests.cs

@@ -0,0 +1,64 @@
+using ModelContextProtocol.Protocol.Transport;
+using System.Net;
+using System.Text;
+
+namespace ModelContextProtocol.AspNetCore.Tests;
+
+public class StreamableHttpServerIntegrationTests(SseServerIntegrationTestFixture fixture, ITestOutputHelper testOutputHelper)
+    : HttpServerIntegrationTests(fixture, testOutputHelper)
+
+{
+     private const string InitializeRequest = """
+        {"jsonrpc":"2.0","id":"1","method":"initialize","params":{"protocolVersion":"2025-03-26","capabilities":{},"clientInfo":{"name":"IntegrationTestClient","version":"1.0.0"}}}
+        """;
+
+    protected override SseClientTransportOptions ClientTransportOptions => new()
+    {
+        Endpoint = new Uri("http://localhost/"),
+        Name = "TestServer",
+        UseStreamableHttp = true,
+    };
+
+    [Fact]
+    public async Task EventSourceResponse_Includes_ExpectedHeaders()
+    {
+        using var initializeRequestBody = new StringContent(InitializeRequest, Encoding.UTF8, "application/json");
+        using var postRequest = new HttpRequestMessage(HttpMethod.Post, "/")
+        {
+            Headers =
+            {
+                Accept = { new("application/json"), new("text/event-stream")}
+            },
+            Content = initializeRequestBody,
+        };
+        using var sseResponse = await _fixture.HttpClient.SendAsync(postRequest, TestContext.Current.CancellationToken);
+
+        sseResponse.EnsureSuccessStatusCode();
+
+        Assert.Equal("text/event-stream", sseResponse.Content.Headers.ContentType?.MediaType);
+        Assert.Equal("identity", sseResponse.Content.Headers.ContentEncoding.ToString());
+        Assert.NotNull(sseResponse.Headers.CacheControl);
+        Assert.True(sseResponse.Headers.CacheControl.NoStore);
+        Assert.True(sseResponse.Headers.CacheControl.NoCache);
+    }
+
+    [Fact]
+    public async Task EventSourceStream_Includes_MessageEventType()
+    {
+        using var initializeRequestBody = new StringContent(InitializeRequest, Encoding.UTF8, "application/json");
+        using var postRequest = new HttpRequestMessage(HttpMethod.Post, "/")
+        {
+            Headers =
+            {
+                Accept = { new("application/json"), new("text/event-stream")}
+            },
+            Content = initializeRequestBody,
+        };
+        using var sseResponse = await _fixture.HttpClient.SendAsync(postRequest, TestContext.Current.CancellationToken);
+        using var sseResponseStream = await sseResponse.Content.ReadAsStreamAsync(TestContext.Current.CancellationToken);
+        using var streamReader = new StreamReader(sseResponseStream);
+
+        var messageEvent = await streamReader.ReadLineAsync(TestContext.Current.CancellationToken);
+        Assert.Equal("event: message", messageEvent);
+    }
+}