AT Command AT+HTTPACTION=0 not responding

Hello everyone,
I tried to connect a sim800L to my Arduino Mega for HTTP requests. However the command AT+HTTPACTION=0 is not responding.

I enter the following commands and when I enter AT+HTTPACTION=0, I get only this response (no error and no confirmation)

the commandsare:

AT+SAPBR=3,1,"CONTYPE","GPRS"
AT+SAPBR=3,1,"APN","internet"
AT+SAPBR=3,1,"USER","ooredoo"
AT+SAPBR=3,1,"PWD","ooredoo"
AT+SAPBR=1,1
AT+SAPBR=2,1
AT+HTTPINIT
AT+HTTPPARA="CID",1
AT+HTTPPARA="URL","test.libelium.com/test-get-post.php?a=1&b=2"
AT+HTTPACTION=0

the responses are:

at

OK
AT+SAPBR=3,1,"CONTYPE","GPRS"

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

OK
AT+SAPBR=3,1,"USER","ooredoo"

OK
AT+SAPBR=3,1,"PWD","ooredoo"

OK
AT+SAPBR=1,1

OK
AT+SAPBR=2,1

+SAPBR: 1,1,"10.61.196.217"

OK
AT+HTTPINIT

OK
AT+HTTPPARA="CID",1

OK
AT+HTTPPARA="URL","test.libelium.com/test-get-post.php?a=1&b=2"

OK
AT+HTTPACTION=0

OK

Finally, the error was a hardware error. The shield was restarting due to lack of power.

Nassim

Hii, ChUlZi

the same problem has to do with me. can you explain what is the main issue?