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Add server-side Streamable HTTP transport support (#330)

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- Changes IJsonRpcMessage to an abstract base class so RelatedTransport will always be available
- Streamable HTTP supports multiple concurrent HTTP request with their own indpendent SSE response streams
- RelatedTransport indicates the source or destination of the JsonRpcMessage

- Changes the default RequestId to a JSON number for better compatibility with MCP servers in the wild
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Stephen Halter 2025-04-18 17:07:23 -07:00 • committed by GitHub
commit 7dcba357d4
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1 changed files with 1637 additions and 395 deletions
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6
src/ModelContextProtocol.AspNetCore/HttpMcpServerBuilderExtensions.cs
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@ -11,11 +11,11 @@ public static class HttpMcpServerBuilderExtensions
{
/// <summary>
/// Adds the services necessary for <see cref="M:McpEndpointRouteBuilderExtensions.MapMcp"/>
/// to handle MCP requests and sessions using the MCP HTTP Streaming transport. For more information on configuring the underlying HTTP server
/// to handle MCP requests and sessions using the MCP Streamable HTTP transport. For more information on configuring the underlying HTTP server
/// to control things like port binding custom TLS certificates, see the <see href="https://learn.microsoft.com/aspnet/core/fundamentals/minimal-apis">Minimal APIs quick reference</see>.
/// </summary>
/// <param name="builder">The builder instance.</param>
/// <param name="configureOptions">Configures options for the HTTP Streaming transport. This allows configuring per-session
/// <param name="configureOptions">Configures options for the Streamable HTTP transport. This allows configuring per-session
/// <see cref="McpServerOptions"/> and running logic before and after a session.</param>
/// <returns>The builder provided in <paramref name="builder"/>.</returns>
/// <exception cref="ArgumentNullException"><paramref name="builder"/> is <see langword="null"/>.</exception>
@ -23,6 +23,8 @@ public static class HttpMcpServerBuilderExtensions
{
ArgumentNullException.ThrowIfNull(builder);
builder.Services.TryAddSingleton<StreamableHttpHandler>();
builder.Services.TryAddSingleton<SseHandler>();
builder.Services.AddHostedService<IdleTrackingBackgroundService>();
if (configureOptions is not null)
{