Ethernet shield / php help

Ok, here’s my arduino code:

#include <Ethernet.h>

byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED };
byte ip[] = { 192, 168, 1, 30 };
byte server[] = { 192, 168, 1, 31 };
Client client(server, 80);

void setup()
{
  Ethernet.begin(mac, ip);
  Serial.begin(9600);
  
  delay(1000);
  
  Serial.println("connecting...");
  
  if (client.connect()) {
    Serial.println("connected");
    client.println("GET /script.php?getdata=1");
    client.println(" HTTP/1.1");
    client.println("Host: 192.168.1.31");
    client.println();
  } else {
    Serial.println("connection failed");
  }
}

void loop()
{
  if (client.available()) {
    char c = client.read();
    Serial.print(c);
  }
  
  if (!client.connected()) {
    Serial.println();
    Serial.println("disconnecting.");
    client.stop();
    for(;;)
      ;
  }
}

Here’s my php code:

<html>

<?php

if ($_GET[getdata] == "1") {

echo "it works";

} else {

echo "no var";

}

?>

</html>

When I run that, on the arduino console i get 400 - Bad request.
However if, in a web browser I do
http://192.168.1.31/script.php?getdata=1
I get the output expected. What am I doing wrong?

Changing the line to

client.println("GET /script.php?getdata=1 HTTP/1.0");

works now