Arduino GPRS http not responding

Question

I am using arduino uno with an iish 3G screen, my screen is working fine, but it is not responding properly with the http command.

After sending "AT+chttpact =......" it returns me +CHTTPACT: REQUEST , and then when it sends a GET command, it does not respond at all

What could be the problem?

here is the actual response and code:

 GSM : Registered to network GSM : Ready for AT command *** Start HTTP Transaction *** +CHTTPACT: REQUEST AT+CHTTPACT="jsonplaceholder.typicode.com",80 Sends Request: GET /posts/1/ HTTP/1.1 Host:jsonplaceholder.typicode.com:80 Content-Length:0 *** End HTTP Transaction *** Memory Free : 1216 

Code:

 // Included header files #include <SoftwareSerial.h> // AT command related #define AT_CREG_QUERY ("AT+CREG?") #define AT_CHTTPACT_COMMAND ("AT+CHTTPACT="%s",%d") #define AT_CHTTPACT_INIT_RESPONSE ("+CHTTPACT: REQUEST") #define AT_CHTTPACT_DATA_RESPONSE ("+CHTTPACT: DATA,") #define AT_CHTTPACT_DONE_RESPONSE ("+CHTTPACT:0") #define EOS ('\0') #define ESC (0x1A) #define OK ("OK") // GSM definitions #define unoTXPin (7) // Uno -> GSM #define unoRXPin (6) // Uno <- GSM #define powerGSMPin (8) #define GSMBaudRate (9600) #define UnoBaudRate (9600) SoftwareSerial gsmSerial(unoRXPin,unoTXPin); #define TEST_REQUEST ("GET /posts/1/ HTTP/1.1\r\nHost:jsonplaceholder.typicode.com:80\r\nContent-Length:0\r\n\r\n") char aux_str [100]; int8_t answer; int aux = 0; int data_size = 0; #define HOST_NAME ("jsonplaceholder.typicode.com") #define HOST_PORT (80) void setup() { // init sequence Serial.begin(UnoBaudRate); gsmSerial.begin(UnoBaudRate); gsm_power_on(); while( (sendATcommand(AT_CREG_QUERY, "+CREG: 0,1", 500) || sendATcommand(AT_CREG_QUERY, "+CREG: 0,5", 500)) == 0 ); Serial.println(F("GSM : Registered to network")); Serial.println(F("GSM : Ready for AT command")); } void loop () { sprintf(aux_str, AT_CHTTPACT_COMMAND, HOST_NAME, HOST_PORT); Serial.println(F("\n*** Start HTTP Transaction ***\n")); Serial.println(AT_CHTTPACT_INIT_RESPONSE); answer = sendATcommand(aux_str, AT_CHTTPACT_INIT_RESPONSE, 60000); Serial.println(aux_str); if (answer == 1) { data_size = 0; Serial.println(F("Sends Request:")); Serial.println(TEST_REQUEST); gsmSerial.println(TEST_REQUEST); // Sends aux_str[0] = ESC; aux_str[1] = 0x00; answer = sendATcommand(aux_str, AT_CHTTPACT_DATA_RESPONSE, 300000); if(answer == 1) { Serial.println(AT_CHTTPACT_DATA_RESPONSE); while(gsmSerial.available() > 0) { Serial.print((char)gsmSerial.read()); } } Serial.println(F("\n*** End HTTP Transaction ***\n")); Serial.print(F("Memory Free : ")); Serial.println(memoryFree()); while(1); // halt } } // variables created by the build process when compiling the sketch extern int __bss_end; extern void *__brkval; // function to return the amount of free RAM int memoryFree(){ int freeValue; if((int)__brkval == 0) freeValue = ((int)&freeValue) - ((int)&__bss_end); else freeValue = ((int)&freeValue) - ((int)__brkval); return freeValue; } void gsm_power_on(){ uint8_t answer=0; // checks if the module is started answer = sendATcommand("AT", "OK", 2000); if (answer == 0) { // power on pulse digitalWrite(powerGSMPin,HIGH); delay(200); digitalWrite(powerGSMPin,LOW); delay(6000); // waits for an answer from the module while(answer == 0){ // Send AT every two seconds and wait for the answer answer = sendATcommand("AT", OK, 2000); } } } int8_t sendATcommand(char* ATcommand, char* expected_answer1, unsigned int timeout) { uint8_t x=0, answer=0; char response[100]; unsigned long previous; memset(response, EOS, 100); // Initialize the string delay(100); while( gsmSerial.available() > 0) gsmSerial.read(); // Clean the input buffer gsmSerial.println(ATcommand); // Send the AT command x = 0; previous = millis(); // this loop waits for the answer do{ if(gsmSerial.available() != 0){ response[x] = gsmSerial.read(); x++; // check if the desired answer is in the response of the module if (strstr(response, expected_answer1) != NULL) { answer = 1; } } // Waits for the asnwer with time out } while((answer == 0) && ((millis() - previous) < timeout)); return answer; } int8_t sendATcommand2(char* ATcommand, char* expected_answer1, char* expected_answer2, unsigned int timeout) { uint8_t x=0, answer=0; char response[100]; unsigned long previous; memset(response, EOS, 100); // Initialize the string delay(100); while( gsmSerial.available() > 0) gsmSerial.read(); // Clean the input buffer Serial.println(ATcommand); // Send the AT command x = 0; previous = millis(); // this loop waits for the answer do{ if(gsmSerial.available() != 0){ response[x] = gsmSerial.read(); x++; // check if the desired answer is in the response of the module if (strstr(response, expected_answer1) != NULL) { answer = 1; } // check if the desired answer is in the response of the module if (strstr(response, expected_answer2) != NULL) { answer = 2; } } // Waits for the asnwer with time out } while((answer == 0) && ((millis() - previous) < timeout)); return answer; }