Websocket error

wss://api.upstox.com/v2/feed/market-data-feed?{=&“guid”= “someguid”,&“method”= “sub”,&“data”= {&“mode”= “full”,&“instrumentKeys”= [“NSE_INDEX|Nifty Bank”]&}=&}=

iam using this endpoint for websocket testing in postman. It is connected but iam not reciving any data when sending ‘ping’ in message iam reciving ‘pong’ message leaving this nothing other data. i want to connect using flutter websocket can anyone help for this iam complaining from many days but no proper solution for this

Same thread i believe