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fix: handle 404 and 406 gracefully in SSE stream initialization #1969

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fix: handle 404 and 406 gracefully in SSE stream initialization #1969

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8 changes: 5 additions & 3 deletions packages/client/src/client/streamableHttp.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -282,9 +282,11 @@ export class StreamableHTTPClientTransport implements Transport {

await response.text?.().catch(() => {});

// 405 indicates that the server does not offer an SSE stream at GET endpoint
// This is an expected case that should not trigger an error
if (response.status === 405) {
// 404: Server has no GET handler for this endpoint (POST-only)
// 405: Server explicitly does not allow GET
// 406: Server rejects Accept header for GET
// All indicate the server does not offer an SSE stream at the GET endpoint
if (response.status === 404 || response.status === 405 || response.status === 406) {
return;
}

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