@skammari I was facing similar issue with python sdk.

Looks like the gtt api path got prefixed with /gtt-service for /createRule, /modifyRule, /cancelRule which is not being allowed by the server and giving 404 with "no Route matched" error.
If possible, you can try calling with old paths for now until the fix it. It worked for me:

'api.gtt.create': ['/rest/secure/angelbroking/gtt/v1/createRule', '/gtt-service/rest/secure/angelbroking/gtt/v1/createRule'],

'api.gtt.modify': ['/rest/secure/angelbroking/gtt/v1/modifyRule', '/gtt-service/rest/secure/angelbroking/gtt/v1/modifyRule'], 'api.gtt.cancel': ['/rest/secure/angelbroking/gtt/v1/cancelRule', '/gtt-service/rest/secure/angelbroking/gtt/v1/cancelRule'],

@jitensaikia Client login and streaming quotes work. but getCandleData with same token/headers returns

{"success":false,"message":"Invalid API Key","errorCode":"AG8004","data":""}

Same issue here- resolved for you? if so please share solution

@admin
Requesting the Angel One technical team to prioritize IPv6 support for SmartAPI. because of this issue we are loosing clients