Cloud Load Balancing - September 12th, 2025 [Change]

## Change The global and classic external Application Load Balancers implemented on Google Front-Ends (GFEs) now support HTTP/1.0 explicitly as a protocol during ALPN (Application-Layer Protocol Negotiation) negotiation. Previously, when the GFEs didn't support HTTP/1.0 explicitly, the GFE would return an `SSL_TLSEXT_ERR_NOACK` response, disable ALPN, and fall back to using HTTP/1 (which includes HTTP/1.0 and HTTP/1.1) as the default application protocol. After this change, GFEs will instead return `HTTP/1.0`, which provides clients with positive confirmation that their advertised `HTTP/1.0` was accepted. You are not expected to make any changes with this update. If a TLS handshake with HTTP/1.0 is unsuccessful, please contact [support](https://cloud.google.com/load-balancing/docs/getting-support).