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Add stateless doc, prefer stateless mode and disable legacy SSE by default (#1468)

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Stephen Halter 2026-03-27 13:56:16 -07:00 • committed by GitHub
commit 8eb4023c20
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1 changed files with 1440 additions and 73 deletions
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10
src/ModelContextProtocol.AspNetCore/StreamableHttpHandler.cs
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@ -219,7 +219,11 @@ internal sealed class StreamableHttpHandler(
{
if (string.IsNullOrEmpty(sessionId))
{
await WriteJsonRpcErrorAsync(context, "Bad Request: Mcp-Session-Id header is required", StatusCodes.Status400BadRequest);
await WriteJsonRpcErrorAsync(context,
"Bad Request: Mcp-Session-Id header is required for GET and DELETE requests when the server is using sessions. " +
"If your server doesn't need sessions, enable stateless mode by setting HttpServerTransportOptions.Stateless = true. " +
"See https://csharp.sdk.modelcontextprotocol.io/concepts/stateless/stateless.html for more details.",
StatusCodes.Status400BadRequest);
return null;
}
@ -302,7 +306,9 @@ internal sealed class StreamableHttpHandler(
&& message is not JsonRpcRequest { Method: RequestMethods.Initialize })
{
await WriteJsonRpcErrorAsync(context,
"Bad Request: A new session can only be created by an initialize request. Include a valid Mcp-Session-Id header for non-initialize requests.",
"Bad Request: A new session can only be created by an initialize request. Include a valid Mcp-Session-Id header for non-initialize requests, " +
"or enable stateless mode by setting HttpServerTransportOptions.Stateless = true if your server doesn't need sessions. " +
"See https://csharp.sdk.modelcontextprotocol.io/concepts/stateless/stateless.html for more details.",
StatusCodes.Status400BadRequest);
return null;
}