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Disable response compression for SSE responses (#208)

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Stephen Halter 2025-04-03 17:53:58 -07:00 • committed by GitHub
commit d1a3c201a4
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1 changed files with 21 additions and 1 deletions
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7
src/ModelContextProtocol.AspNetCore/McpEndpointRouteBuilderExtensions.cs
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@ -1,4 +1,5 @@
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Http.Features;
using Microsoft.AspNetCore.Routing;
using Microsoft.AspNetCore.WebUtilities;
using Microsoft.Extensions.DependencyInjection;
@ -39,7 +40,7 @@ public static class McpEndpointRouteBuilderExtensions
var requestAborted = context.RequestAborted;
response.Headers.ContentType = "text/event-stream";
response.Headers.CacheControl = "no-store";
response.Headers.CacheControl = "no-cache,no-store";
var sessionId = MakeNewSessionId();
await using var transport = new SseResponseStreamTransport(response.Body, $"/message?sessionId={sessionId}");
@ -50,6 +51,10 @@ public static class McpEndpointRouteBuilderExtensions
try
{
// Make sure we disable all response buffering for SSE
context.Response.Headers.ContentEncoding = "identity";
context.Features.GetRequiredFeature<IHttpResponseBodyFeature>().DisableBuffering();
var transportTask = transport.RunAsync(cancellationToken: requestAborted);
await using var server = McpServerFactory.Create(transport, mcpServerOptions.Value, loggerFactory, endpoints.ServiceProvider);