error 404 in HTTP GET request with Arduino Uno and ESP8266 using AT commands

Question

when I try to send http get request I get error 404

AT+CIPMTX=1
OK
AT+CIPSTART=4,"TCP","alirezaabrhshami.ir",80
4,CONNECT
OK
AT⸮⸮R5U9⸮⸮b⸮⸮j
OK
>
Recv 47 qytes
SEND OK
+IPD,4,223;HTTP/1.1 404 Not Found
Cache-Contsol: public, max-age=0:a1n CeK⸮

this is my code:

#include <SoftwareSerial.h>
const byte rxPin = 2;
const byte txPin = 3;
SoftwareSerial ESP8266 (rxPin, txPin);
unsigned long lastTimeMillis = 0;
void setup() {
 Serial.begin(9600); 
 ESP8266.begin(115200);
 delay(2000);
}
void printResponse() {
 while (ESP8266.available()) {
 Serial.println(ESP8266.readStringUntil('\n')); 
 }
}
void loop() {
 if (millis() - lastTimeMillis > 30000) {
 lastTimeMillis = millis();
 ESP8266.println("AT+CIPMUX=1");
delay(1000);
printResponse();
ESP8266.println("AT+CIPSTART=4,\"TCP\",\"alirezaabrishami.ir\",80");
delay(1000);
printResponse();
String cmd = "GET /greencare/login.php?product_id=123456 ";
ESP8266.println("AT+CIPSEND=4," + String(cmd.length() + 4));
delay(1000);
ESP8266.println(cmd);
delay(1000);
ESP8266.println(""); 
 }
 if (ESP8266.available()) {
 Serial.write(ESP8266.read());
 }
}

• Juraj: there is no /greencare/login.php?product_id=123456 on the server
• alireza: but there is : alirezaabrishami.ir/greencare/login.php?product_id=123456

Answer 1

your HTTP request is incomplete. it should be

String cmd = "GET /greencare/login.php?product_id=123456 HTTP/1.1\r\nHost:alirezaabrishami.ir\r\n\r\n"

if the wen server host has more hostnames for the same IP address, the Host header is used on HTTP server to direct the request to the right web application