Can Envoy manage WebSocket traffic?

Envoy can indeed manage WebSocket traffic effectively because it is built upon the HTTP/2 and HTTP/1.x protocols, which facilitates the handling of WebSocket connections directly. When a client tries to establish a WebSocket connection, it typically starts with an HTTP handshake. Envoy is capable of recognizing this handshake and can upgrade the HTTP connection accordingly to establish a WebSocket connection.

The ability to upgrade the connection is crucial for WebSockets, which rely on persistent connections for efficient real-time data exchange. Envoy’s architecture supports both the initial HTTP request and the subsequent upgrade, enabling it to function as a proxy for WebSocket communications seamlessly.

Though the other options suggest limitations or conditions for managing WebSocket traffic, they do not accurately reflect Envoy's capabilities. The direct support for upgrading an HTTP connection to a WebSocket connection makes it a versatile choice for applications requiring real-time communication.