Azure Cosmos db with SIM868e

Hi everyone!
I am using SIM868e for my application. i am trying to GET the databases list from my Azure cosmos db. But i am not able to do it. I am using AT commands. Below are the AT command lines and responses:

AT

OK

AT

OK

AT+SAPBR=3,1,"Contype","GPRS"

OK

AT+SAPBR=3,1,APN,"internet"

OK

AT+SAPBR=1,1

OK

AT+SAPBR=2,1

+SAPBR: 1,1,"100.83.233.231"

OK

AT+HTTPINIT

OK

AT+HTTPSSL=1

OK

AT+HTTPPARA=CID,"1"

OK

 AT+HTTPPARA="URL","https://mydatabaseaccount.documents.azure.com/dbs/testdb:443/"

OK

AT+HTTPPARA="USERDATA","Authorization: {primary key}"

OK

AT+HTTPPARA="CONTENT","application/json"

OK

AT+HTTPACTION=0

OK
AT+HTTPREAD

+HTTPREAD: 259
{"code":"BadRequest","message":"Invalid API version. Ensure a valid x-ms-version header value is passed. Please update to the latest version of Azure Cosmos DB SDK.\r\nActivityId: a3e60ab5-6610-4d4c-a

Can anybody how to fix this?