error while attempting http-get with SIM808 | ThingSpeak Projects | Forum

hi
im trying to update thinkspeak from sim808 but getting network error . kindly please check below and let me know if this is anything wrong in my methodology. im using terminal.exe to send command via RS232.

AT
OK
AT+CREG?
+CREG: 0,5 //connected in roaming
AT+SAPBR=3,1,"Contype","GPRS"
OK
AT+SAPBR=3,1,"APN","www" //VODAFONE INDIA "www" is APN (as per the operator)
OK
AT+SAPBR=3,1,"USER","" //blank (as per the operator)
OK
AT+SAPBR=3,1,"PWD","" //blank (as per the operator)
AT+SAPBR=1,1
OK
AT+HTTPINIT
OK
AT+HTTPPARA="CID","1"
OK
AT+HTTPARA="URL","https://api.thingspeak.com/update?api_key=MY_KEY&field1=VALUE"
OK
AT+HTTPACTION=0
+HTTPACTION: 0,603,0 //means network error as per the document

note: while im typing in browser url box, https://api.thingspeak.com/update?api_key=MY_KEY&field1=VALUE, i can able to update my field. i can able make call, send sms, i have internet pack

PLEASE HELP