PHP: Connection: keep-alive problem reading socket data

Question

Trying to write data to a socket and read the response.

$packet = "GET /get-database HTTP/1.1\r\n";
$packet .= "Host: 192.168.3.136:3689\r\n";
//$packet .= "Accept-Encoding: gzip\r\n";
$packet .= "Viewer-Only-Client: 1\r\n";
$packet .= "Connection: keep-alive\r\n\r\n";

socket_write($socket, $packet, strlen($packet));

do{
    $buf = "";
    $buf = socket_read($socket, 4096);
    $data .= $buf;
}while($buf != "");

echo "$data\r\n\r\n";

If I set the Connection to close then it works and I'm able to read the response. The problem with that is, that after I read the data, I need to write back to the socket. The response contains an id that I need to send back for verification. If I write to the server on two separate sockets, it rejects the verification post back. So I can only assume, that I need to post on same "open connection" or "session".

Any thoughts?

I would like to figure out why I can't read from the socket with Connection: keep-alive

####### EDIT

There has been a little development on this. I'm trying to make this very simple so I can pinpoint the problem:

Right now my code looks like this:

$fp = pfsockopen("192.168.3.136", "3689");
$content = "GET /login?id=a90347 HTTP/1.1\r\n";
$content .= "Connection: keep-alive\r\n\r\n";

fputs($fp, $content);

while (!feof($fp)) {
    echo fgets($fp, 8192);
}

What happens is, as soon as I do my fputs, I get a response header from the server that looks like this:

HTTP/1.1 200 OK
Date: Fri, 05 Mar 2010 22:05:47 GMT
RIPT-Server: iTunesLib/3.0.2 (Mac OS X)
Content-Type: application/x-dmap-tagged
Content-Length: 32

And then my cursor just sits there. After anywhere from 15 seconds to a minute, I sometimes get the content, but I am still stuck in the while loop.

Does anyone know, if after the server has sent the response header, if I should be sending something back to it to let it know that I am ready for the content?

Again, I don't think this is the case, since when I look in the packets on the network, I can see the entire response. That and the fact that I do sometimes get the content of the response. It's really like PHP can't handle this or I am just way off base.

Still need help..... :(

Working Code

$fp = pfsockopen("192.168.3.136", "3689");
$header = "GET /login?id=5648349 HTTP/1.1\r\n";
$header .= "Connection: keep-alive\r\n\r\n";

fputs($fp, $header);

$headers = array();

while(true){
    $line = fgets($fp, 8192);
    if($line == "\r\n"){ break; }
    $line_parts = explode(': ',$line);
    echo $line_parts[1]."\r\n";
  $headers[$line_parts[0]] = $line_parts[1];
}
$content = fread($fp,intval($headers['Content-Length']));
echo $content;

Now, I'll have to be wary of the "\r\n" test as I'm sure it's possible that some responses might only send a "\n" after the header.

Answer 1

Did you try setting the socket to nonblocking mode?

socket_set_nonblock($socket);

EDIT1: Ok. Just a hunch... try this...

$fp = pfsockopen("192.168.3.136", "3689");
$content = "GET /login?id=a90347 HTTP/1.1\r\n";
$content .= "Connection: keep-alive\r\n\r\n";

fputs($fp, $content);

$headers = array();

do
{
  $line = fgets($fp, 8192);
  $line_parts = ecplode(': ',$line);
  $headers[$line_parts[0]] = $line_parts[1];
} while($line != '');

$content = fread($fp,intval($headers['Content-Length']));

echo $content;