@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'],