fix(client): suppress SSE-disconnect onerror when abort came from intentional close()

felixweinberger · felixweinberger · commit bb9eef832070 · 2026-04-09T17:57:42.000Z
diff --git a/packages/client/src/client/streamableHttp.ts b/packages/client/src/client/streamableHttp.ts
@@ -474,7 +474,7 @@ export class StreamableHTTPClientTransport implements Transport {
                     } catch (error) {
                         this.onerror?.(new Error(`Failed to reconnect: ${error instanceof Error ? error.message : String(error)}`));
                     }
-                } else {
+                } else if (!this._abortController?.signal.aborted) {
                     // Stream disconnected and reconnection will not happen; surface the error
                     this.onerror?.(new Error(`SSE stream disconnected: ${error instanceof Error ? error.message : String(error)}`));
                 }

Original file line number	Diff line number	Diff line change
`@@ -474,7 +474,7 @@ export class StreamableHTTPClientTransport implements Transport {`
`474`	`474`	`} catch (error) {`
`475`	`475`	this.onerror?.(new Error(`Failed to reconnect: ${error instanceof Error ? error.message : String(error)}`));
`476`	`476`	`}`
`477`		`- } else {`
	`477`	`+ } else if (!this._abortController?.signal.aborted) {`
`478`	`478`	`// Stream disconnected and reconnection will not happen; surface the error`
`479`	`479`	this.onerror?.(new Error(`SSE stream disconnected: ${error instanceof Error ? error.message : String(error)}`));
`480`	`480`	`}`