8.2.0

May 28 2026

Added

• Config.UseHTTP2 now defaults to true and NewHTTP2Client is rebuilt on net/http.Transport with ForceAttemptHTTP2 + http2.ConfigureTransport, so HTTPS connections prefer HTTP/2 via TLS ALPN and fall back to HTTP/1.1 when the origin doesn't advertise h2. The single subscribe loop reuses the cached *http.Client across long-poll cycles, and on SubscriptionManager.reconnect SDK-managed clients are dropped so the next request re-runs TLS+ALPN — user-supplied clients pinned via SetClient/SetSubscribeClient are preserved. Set UseHTTP2 = false to opt out.
• Network response log messages now carry the OperationType and the negotiated protocol from *http.Response.Proto. The formatted line becomes PubNub request completed: operation=<Op> protocol=<HTTP/x.y> status=<n> url=<…> body=<…>, and the value is also retained on the PubNub instance as lastNegotiatedProto for internal use. No public API change.

Fixed

• Destroy previously dereferenced pn.client unconditionally, read the field without holding pn.Lock, and never closed pn.subscribeClient (most impactful on HTTP/2 where one long-lived session per origin holds the only physical connection). The new closeManagedHTTPClients snapshots both clients under pn.Lock, clears the pointers, and calls CloseIdleConnections outside the lock on whichever clients are non-nil.

Modified

• Add a generic eventually polling test helper and update the gotestsum-based runner to automatically retry failing tests up to 3 times.