Mobile Websocket failed to use connection and reported ProtocolException error

the development of mobile app during the recent winter vacation requires Websocket to receive messages pushed in the background
I use RxWebSocket to connect

there"s nothing wrong with writing a small demo with ws://echo.websocket.org
, but replacing it with the url provided by the background occurs the following situation

Excuse me, what is the problem with this?

Mysql ubuntu java android
May.09,2022

Sorry, it was found that url made a mistake

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MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1e3e101-597d3.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1e3e101-597d3.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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