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Add stateless Streamable HTTP support (#392)

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- It allows a single MCP session spanning multiple requests
  to be handled by different servers without sharing state
- It does require the servers share data protection keys, but this
  is standard for ASP.NET Core cookies and antiforgery as well
- It immediately throws for unsupported operations like sampling
This commit is contained in:
Stephen Halter 2025-05-14 04:51:03 -07:00 • committed by GitHub
commit ce9f73f43f
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1 changed files with 785 additions and 230 deletions
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58
tests/ModelContextProtocol.AspNetCore.Tests/MapMcpSseTests.cs
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@ -7,6 +7,31 @@ namespace ModelContextProtocol.AspNetCore.Tests;
public class MapMcpSseTests(ITestOutputHelper outputHelper) : MapMcpTests(outputHelper)
{
protected override bool UseStreamableHttp => false;
protected override bool Stateless => false;
[Theory]
[InlineData("/mcp")]
[InlineData("/mcp/secondary")]
public async Task Allows_Customizing_Route(string pattern)
{
Builder.Services.AddMcpServer().WithHttpTransport(ConfigureStateless);
await using var app = Builder.Build();
app.MapMcp(pattern);
await app.StartAsync(TestContext.Current.CancellationToken);
using var response = await HttpClient.GetAsync($"http://localhost{pattern}/sse", HttpCompletionOption.ResponseHeadersRead, TestContext.Current.CancellationToken);
response.EnsureSuccessStatusCode();
using var sseStream = await response.Content.ReadAsStreamAsync(TestContext.Current.CancellationToken);
using var sseStreamReader = new StreamReader(sseStream, System.Text.Encoding.UTF8);
var eventLine = await sseStreamReader.ReadLineAsync(TestContext.Current.CancellationToken);
var dataLine = await sseStreamReader.ReadLineAsync(TestContext.Current.CancellationToken);
Assert.NotNull(eventLine);
Assert.Equal("event: endpoint", eventLine);
Assert.NotNull(dataLine);
Assert.Equal($"data: {pattern}/message", dataLine[..dataLine.IndexOf('?')]);
}
[Theory]
[InlineData("/a", "/a/sse")]
@ -32,37 +57,4 @@ public class MapMcpSseTests(ITestOutputHelper outputHelper) : MapMcpTests(output
Assert.Equal("TestCustomRouteServer", mcpClient.ServerInfo.Name);
}
[Fact]
public async Task Can_UseHttpContextAccessor_InTool()
{
Builder.Services.AddMcpServer().WithHttpTransport().WithTools<EchoHttpContextUserTools>();
Builder.Services.AddHttpContextAccessor();
await using var app = Builder.Build();
app.Use(next =>
{
return async context =>
{
context.User = CreateUser("TestUser");
await next(context);
};
});
app.MapMcp();
await app.StartAsync(TestContext.Current.CancellationToken);
var mcpClient = await ConnectAsync();
var response = await mcpClient.CallToolAsync(
"EchoWithUserName",
new Dictionary<string, object?>() { ["message"] = "Hello world!" },
cancellationToken: TestContext.Current.CancellationToken);
var content = Assert.Single(response.Content);
Assert.Equal("TestUser: Hello world!", content.Text);
}
}