Nsryjdtyk

My home.php page has various hrefs. When one of these hrefs is clicked, it opens up a second window called sseReceiver.php. The home.php window stays open too. sseReceiver.php uses a server sent event source called theSource.php to receive events and display them in a table.

theSource.php establishes a socket connection to a socket that was created using a Java server.
When the Java server generates a message, theSource.php receives it and flushes it. sseReceiver.php picks up this message and displays it.

This works well.

However, while sseReceiver.php is open, if I click on any other href on my home.php page, the page is stuck loading and ultimately gives a 504 error.

Question
Why am I unable to access the other links on home.php while sseReceiver.php is running?
Is there a way to run theSource.php in a different thread so that I can still access the rest of the website simultaneously?

Appreciate your suggestions and help.

Thank you.

Code for theSource.php

session_start();    

header("Content-Type: text/event-streamnn");

header('Cache-Control: no-cache');

set_time_limit(0);

ob_end_flush();

ob_implicit_flush(1);



function sendMessage($message)

{   

    $explodedData = explode(',', $message);

    $data = array();            

    foreach ($explodedData as $result) 

    {

        $b = explode('^', $result);

        $data[trim($b[0])] = trim($b[1]);

    }   

    //sse stuff

    echo("retry: 3000n");

    echo('data: '. json_encode($data));             

    echo "nn";

    flush();

}





$serverAddress=SERVER_ADDRESS;

$serverListeningPort=SERVER_PORT;

//make a connection and get a socket object

if ( ($socket = socket_create(AF_INET, SOCK_STREAM, SOL_TCP)) === FALSE )

{

    echo "socket_create() failed: reason: " .socket_strerror(socket_last_error());

}

else

{

    echo("socket create was successful");

    echo("<br>");

}

echo ("Attempting to connect to host");

echo("<br>");

if ( ($result = socket_connect($socket, $serverAddress, $serverListeningPort)) === FALSE )

{



    echo ("socket_connect() failed. Reason:".socket_strerror(socket_last_error($socket)));

}

echo ("Reading response:");

$message="";



while(true)

{                           

    $message=socket_read($socket, 300);

    if($message!=='')

    {

        sendMessage($message);  

    }

}

Code for sseReceiver.php

var evtSource=new EventSource("theSource.php");     



evtSource.onmessage=function(event)

{           

    var payload=JSON.parse(event.data);     

    // code to display payload on webpage in a table

}