The Upgrade header field provides a mechanism to transition from HTTP/1.1 to another protocol on the same connection. For example, it is the mechanism used by WebSocket's initial HTTP handshake to establish a WebSocket connection.
TheUpgrade header field provides a mechanism to transition from HTTP/1.1 to another protocol on the same connection. For example, it is the mechanism used by WebSocket's initial HTTP handshake to establish a WebSocket connection.头部字段提供一种在同一连接上从 HTTP/1.1 切换到其他协议的机制。例如，WebSocket 的初始 HTTP 握手就是利用该机制来建立 WebSocket 连接的。
The Upgrade header field provides a mechanism to transition from HTTP/1.1 to another protocol on the same connection. For example, it is the mechanism used by WebSocket's initial HTTP handshake to establish a WebSocket connection.
The Upgrade header field provides a mechanism to transition from HTTP/1.1 to another protocol on the same connection. For example, it is the mechanism used by WebSocket's initial HTTP handshake to establish a WebSocket connection.
06/05/2026
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TheUpgradeheader field provides a mechanism to transition from HTTP/1.1 to another protocol on the same connection. For example, it is the mechanism used by WebSocket's initial HTTP handshake to establish a WebSocket connection.头部字段提供一种在同一连接上从 HTTP/1.1 切换到其他协议的机制。例如，WebSocket 的初始 HTTP 握手就是利用该机制来建立 WebSocket 连接的。