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504 on AWS ec2 without executing long php script

I encountered an HTTP 504 timeout error for several times when I tried to call the GET API that was programmed by PHP.

Here is my server and AWS environment.

  • An ec2 exam with Amazon Linux that runs php code (5.4.40) with the apache server (2.4.12) to serve the api call from the client.
  • AWS elastic load platform for balancing traffic to one of my instances. (for now, I only have one instance, just install ELB for the future if I need more instances to handle traffic.)
  • AWS RDS Database (MySQL 5.6.21) for saving data.

From some articles about 504 gateway timeouts, I already tried to change these settings:

 # ELB
 idle timeout => 300

 # php.ini
 max_execution_time => 301
 max_input_time => 301

 # httpd conf
 MaxKeepAliveRequests => 100
 KeepAliveTimeout => 30

But all of them do not help me, he still gets a 504 gateway timeout.

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  - Class2.php

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Class1

// Class1
namespace My\Namespace;
class Class1 {
    public static function getInstance() {
        //return...
    }
}

Class2

// Class2
namespace My\Namespace;
class Class2 {
    public static function getInstance() {
        //return...
    }

    public function getClass1Instance() {
        $class1 = Class1::getInstance();
        return $class1;
    }
}

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