在文档中添加交互式 WebSocket 演练场，让用户可以测试实时连接、发送消息并查看事件流。
Documentation Index
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{
"text": "<string>",
"subtext": "<string>",
"from": "<string>"
}{
"text": "<string>",
"subtext": "<string>",
"from": "<string>"
}"22:02:27 GMT+0000 (Coordinated Universal Time)"Test message sent to the echo server
Test message sent to the echo server
Timestamp message sent from echo hoppscotch server
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{
"text": "<string>",
"subtext": "<string>",
"from": "<string>"
}{
"text": "<string>",
"subtext": "<string>",
"from": "<string>"
}"22:02:27 GMT+0000 (Coordinated Universal Time)"