why arduino can not write to server? i write a code for Arduino + SIM800 for connecting to server.
but it don't work!

SerialGsm.println("AT+CIPSEND=63\r\n");
delay( 1000 );
receive_message();
SerialGsm.print( "GET http://sasasas.ir.ir/hadi/signal.php?value=10" );
delay( 10000 );
receive_message();


all thing is true but "GET" can not retrun "OK".
it is arduino response:



AT

OK

Call Ready

SMS Ready
AT+CSTT="mtnirancell"

OK
AT+CIICR

OK
AT+CIFSR

100.65.157.141
AT+CIPSTART="TCP","sasasas.ir",80

OK

CONNECT OK
AT+CIPSEND=63


  GET http://sasasas.ir/hadi/signal.php?value=10
  
  


"get" dont have response.what is wrong in this code?
Firstly you only have half of the first line of a GET request. Secondly the half you do have is badly formatted.

A GET request does NOT look like this:

GET http://jalambadani.ir/hadi/signal.php?value=10


A GET request DOES look like this:

GET /hadi/signal.php?value=10 HTTP/1.1
Host: jalambadani.ir
Connection: close
[extra blank line]


If you don't send the correct data you can't expect to get any response back.  You should learn the basics of what you are trying to do instead of just throwing random text a a web server.



Here is a full transcript of a GET request to your URL:

$ telnet jalambadani.ir 80
Trying 185.211.56.148...
Connected to jalambadani.ir.
Escape character is '^]'.
GET /hadi/signal.php?value=10 HTTP/1.1
Host: jalambadani.ir
Connection: close

HTTP/1.1 200 OK
Date: Tue, 25 Jun 2019 22:47:07 GMT
Server: Apache/2
X-Powered-By: PHP/5.6.35
Upgrade: h2,h2c
Connection: Upgrade, close
Vary: User-Agent
Content-Length: 31
Content-Type: text/html; charset=UTF-8

New record created successfullyConnection closed by foreign host.


In code that would be:

SerialGsm.print("AT+CIPSEND=83\r\n");
delay(1000); // I hate that. Look for a proper OK instead.
SerialGsm.print("GET /hadi/signal.php?value=15 HTTP/1.1\r\n");
SerialGsm.print("Host: jalambadani.ir\r\n");
SerialGsm.print("Connection: close\r\n");
SerialGsm.print("\r\n);