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fix(gateway): reject GET requests to prevent SSE reconnection loop #2305

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fix(gateway): reject GET requests to prevent SSE reconnection loop #2305

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20 changes: 20 additions & 0 deletions apps/mesh/src/api/routes/gateway.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -63,6 +63,26 @@ export async function handleVirtualMcpRequest(
},
virtualMcpId: string | undefined,
) {
// Reject GET requests to prevent SSE reconnection loops.
// Virtual MCPs are aggregators that respond to client requests - they don't
// need server-initiated messages (SSE). When clients send GET requests for
// SSE streaming, our stateless transport setup closes immediately after
// handleRequest returns, causing an infinite reconnection loop.
// By rejecting GET, clients fall back to POST-only mode which works correctly.
if (c.req.raw.method === "GET") {
return c.json(
{
jsonrpc: "2.0",
error: {
code: -32000,
message: "SSE streaming not supported. Use POST requests only.",
},
id: null,
},
405,
);
}

const ctx = c.get("meshContext");

try {
Expand Down