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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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22
tests/ModelContextProtocol.AspNetCore.Tests/SseIntegrationTests.cs
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@ -17,13 +17,13 @@ namespace ModelContextProtocol.AspNetCore.Tests;
public partial class SseIntegrationTests(ITestOutputHelper outputHelper) : KestrelInMemoryTest(outputHelper)
{
private SseClientTransportOptions DefaultTransportOptions = new()
private readonly SseClientTransportOptions DefaultTransportOptions = new()
{
Endpoint = new Uri("http://localhost/sse"),
Name = "In-memory Test Server",
Name = "In-memory SSE Client",
};
private Task<IMcpClient> ConnectMcpClient(HttpClient? httpClient = null, SseClientTransportOptions? transportOptions = null)
private Task<IMcpClient> ConnectMcpClientAsync(HttpClient? httpClient = null, SseClientTransportOptions? transportOptions = null)
=> McpClientFactory.CreateAsync(
new SseClientTransport(transportOptions ?? DefaultTransportOptions, httpClient ?? HttpClient, LoggerFactory),
loggerFactory: LoggerFactory,
@ -37,7 +37,7 @@ public partial class SseIntegrationTests(ITestOutputHelper outputHelper) : Kestr
app.MapMcp();
await app.StartAsync(TestContext.Current.CancellationToken);
await using var mcpClient = await ConnectMcpClient();
await using var mcpClient = await ConnectMcpClientAsync();
// Send a test message through POST endpoint
await mcpClient.SendNotificationAsync("test/message", new Envelope { Message = "Hello, SSE!" }, serializerOptions: JsonContext.Default.Options, cancellationToken: TestContext.Current.CancellationToken);
@ -52,7 +52,7 @@ public partial class SseIntegrationTests(ITestOutputHelper outputHelper) : Kestr
MapAbsoluteEndpointUriMcp(app);
await app.StartAsync(TestContext.Current.CancellationToken);
await using var mcpClient = await ConnectMcpClient();
await using var mcpClient = await ConnectMcpClientAsync();
// Send a test message through POST endpoint
await mcpClient.SendNotificationAsync("test/message", new Envelope { Message = "Hello, SSE!" }, serializerOptions: JsonContext.Default.Options, cancellationToken: TestContext.Current.CancellationToken);
@ -84,7 +84,7 @@ public partial class SseIntegrationTests(ITestOutputHelper outputHelper) : Kestr
app.MapMcp();
await app.StartAsync(TestContext.Current.CancellationToken);
await using var mcpClient = await ConnectMcpClient();
await using var mcpClient = await ConnectMcpClientAsync();
mcpClient.RegisterNotificationHandler("test/notification", (args, ca) =>
{
@ -124,7 +124,7 @@ public partial class SseIntegrationTests(ITestOutputHelper outputHelper) : Kestr
app.MapMcp();
await app.StartAsync(TestContext.Current.CancellationToken);
await using var mcpClient = await ConnectMcpClient();
await using var mcpClient = await ConnectMcpClientAsync();
// Options can be lazily initialized, but they must be instantiated by the time an MCP client can finish connecting.
// Callbacks can be called multiple times if configureOptionsAsync is configured, because that uses the IOptionsFactory,
@ -184,14 +184,14 @@ public partial class SseIntegrationTests(ITestOutputHelper outputHelper) : Kestr
var sseOptions = new SseClientTransportOptions()
{
Endpoint = new Uri("http://localhost/sse"),
Name = "In-memory Test Server",
Name = "In-memory SSE Client",
AdditionalHeaders = new()
{
["Authorize"] = "Bearer testToken"
},
};
await using var mcpClient = await ConnectMcpClient(transportOptions: sseOptions);
await using var mcpClient = await ConnectMcpClientAsync(transportOptions: sseOptions);
Assert.True(wasGetRequest);
Assert.True(wasPostRequest);
@ -211,14 +211,14 @@ public partial class SseIntegrationTests(ITestOutputHelper outputHelper) : Kestr
var sseOptions = new SseClientTransportOptions()
{
Endpoint = new Uri("http://localhost/sse"),
Name = "In-memory Test Server",
Name = "In-memory SSE Client",
AdditionalHeaders = new()
{
[""] = ""
},
};
var ex = await Assert.ThrowsAsync<InvalidOperationException>(() => ConnectMcpClient(transportOptions: sseOptions));
var ex = await Assert.ThrowsAsync<InvalidOperationException>(() => ConnectMcpClientAsync(transportOptions: sseOptions));
Assert.Equal("Failed to add header '' with value '' from AdditionalHeaders.", ex.Message);
}