[FIXED] PHP cURL required only to send and not wait for response

Issue

I need a PHP cURL configuration so that my script is able to send requests and ignore the answers sent by the API.

curl_setopt($ch,CURLOPT_URL,$url);
curl_setopt($ch,CURLOPT_POST,count($fields));
curl_setopt($ch,CURLOPT_POSTFIELDS,$fields_string);
// curl_setopt($ch, CURLOPT_RETURNTRANSFER, false);
//curl_setopt($ch, CURLOPT_TIMEOUT_MS, 100);
$result = curl_exec($ch);
echo $result;
curl_close ($ch);

I tried adding: // curl_setopt($ch, CURLOPT_RETURNTRANSFER, false); //curl_setopt($ch, CURLOPT_TIMEOUT_MS, 100);

But its not working properly and the API webserver is not receiving the requests.

The reason for this is I am sending large amount of requests to the API therefore my script is very slow because it waits for each and every request.

Any help is appreciated.

Solution

Sender file example ./ajax/sender.php

Below we trying just make ping to php script without waiting on answer

    $url = 'https://127.0.0.1/ajax/received.php';
    $curl = curl_init();                
    $post['test'] = 'examples daata'; // our data todo in received
    curl_setopt($curl, CURLOPT_URL, $url);
    curl_setopt ($curl, CURLOPT_POST, TRUE);
    curl_setopt ($curl, CURLOPT_POSTFIELDS, $post); 
    
    curl_setopt($curl, CURLOPT_USERAGENT, 'api');

    //curl_setopt($curl, CURLOPT_TIMEOUT, 1); //if your connect is longer than 1s it lose data in POST better is finish script in recevie
    curl_setopt($curl, CURLOPT_HEADER, 0);
    curl_setopt($curl,  CURLOPT_RETURNTRANSFER, false);
    curl_setopt($curl, CURLOPT_FORBID_REUSE, true);
    curl_setopt($curl, CURLOPT_CONNECTTIMEOUT, 1);
    curl_setopt($curl, CURLOPT_DNS_CACHE_TIMEOUT, 10); 
    
    curl_setopt($curl, CURLOPT_FRESH_CONNECT, true);
    
    curl_exec($curl);   
    
    curl_close($curl);  

Received file example ./ajax/received.php

EDIT 2019 if you using fastcgi just finish fastcgi and browser close connection but script still will be working up to end.

How finish script: PHP mod_fcgi with fastcgi_finish_request();

For Apache2:

ob_end_flush();
flush();

For php-fpm

fastcgi_finish_request(); $this->db->query('UPDATE new_hook_memory SET new=new+1 WHERE id=1');

Old version:

ob_end_clean(); //if our framework have turn on ob_start() we don't need bufering respond up to this script will be finish 
    header("Connection: close\r\n"); //send information to curl is close
    header("Content-Encoding: none\r\n"); //extra information 
    header("Content-Length: 1"); //extra information
    ignore_user_abort(true); //script will be exisits up to finish below query even web browser will be close before sender get respond

    //we doing here what we would like do
    $this->db->query('UPDATE new_hook_memory SET new=new+1 WHERE id=1');    

 

Answered By - Kamil Dąbrowski