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Streamable HTTP resumability + redelivery + SSE polling via server-side disconnect (#1077)

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Co-authored-by: Stephen Halter <halter73@gmail.com>
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Mackinnon Buck 2026-01-14 22:54:25 -08:00 • committed by GitHub
commit b8311756b4
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1 changed files with 2675 additions and 246 deletions
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6
src/ModelContextProtocol.AspNetCore/McpEndpointRouteBuilderExtensions.cs
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@ -41,10 +41,12 @@ public static class McpEndpointRouteBuilderExtensions
if (!streamableHttpHandler.HttpServerTransportOptions.Stateless)
{
// The GET and DELETE endpoints are not mapped in Stateless mode since there's no way to send unsolicited messages
// for the GET to handle, and there is no server-side state for the DELETE to clean up.
// The GET endpoint is not mapped in Stateless mode since there's no way to send unsolicited messages.
// Resuming streams via GET is currently not supported in Stateless mode.
streamableHttpGroup.MapGet("", streamableHttpHandler.HandleGetRequestAsync)
.WithMetadata(new ProducesResponseTypeMetadata(StatusCodes.Status200OK, contentTypes: ["text/event-stream"]));
// The DELETE endpoint is not mapped in Stateless mode since there is no server-side state for the DELETE to clean up.
streamableHttpGroup.MapDelete("", streamableHttpHandler.HandleDeleteRequestAsync);
// Map legacy HTTP with SSE endpoints only if not in Stateless mode, because we cannot guarantee the /message requests