Not getting response from fsocket? Simple exchange. What did I miss?

[StewardManscat]

This must have been done a thousand times!

It seems simple, but I am geting stumped.

I want a client script to lookup at another site before producing browser output.

The client script opens a socket and sends a request. Works. Check.

The server script receives the request and performs the lookup. Works. Check.

The server sends a response. Seems to work.

The client does not get it. Failed.

Not sure if server (2nd script below) should be sending with GET or using a different mime type, or if I am way out to lunch and doing something awful wrong. The response code is short and simple.

On the client side...

/////////////////////////////////////////////////////////
// www.client.com/client.php
// SITE CLIENT SENDS TO SITE HOME, REQUESTING LOOKUP FOR ID 3356

$request="do=lookup&id=3356";

$header='';
$header .= "POST /home.php HTTP/1.0\r\n";
$header .= "Host: www.home.com\r\n";
$header .= "Content-Type: application/x-www-form-urlencoded\r\n";
$header .= "Content-Length: " . strlen($request) . "\r\n\r\n";
$fp = fsockopen ('www.home.com', 80, $errno, $errstr, 45);

if (!$fp)
{
	// HTTP ERROR LOGGING ETC
	$res='';
}
else
{
	// Post info, wait for response.  Sending works. But response is empty.
	fputs ($fp, $header . $req);
	while (!feof($fp))
	{
		$res = fgets ($fp, 1024);
	}
	fclose ($fp);
	flush();
}

// I NEVER GET THE RESPONSE HERE.
if($res='HAPPY')
{
	// Good. I have a response. I am off to the races
	// ...
}
else
{
	// No response. I do something else.
	// ...
}
// end of script. User sees some kind of response.

On the server side...

///////////////////////////////////////////////////////////////////////////////////
// www.home.com/home.php
// HOME SITE RECEIVES REQUEST AND REPLIES...

// Received posted request, did the lookup, set $reponse. All good so far. Now send response.
$response='HAPPY';

// THIS RESPONSE DOES NOT GET RECEIVED BY THE SCRIPT ABOVE
$header='';
$header .= "POST /client.php HTTP/1.0\r\n";
$header .= "Host: www.client.com\r\n";
$header .= "Content-Type: application/x-www-form-urlencoded\r\n";
$header .= "Content-Length: " . strlen($response) . "\r\n\r\n";
$fp = fsockopen ('www.client.com', 80, $errno, $errstr, 45);

if (!$fp)
{
	// HTTP ERROR LOGGING ETC
}
else
{
	// Reply and exit
	fputs ($fp, $header . $response);
	fclose ($fp);
	flush();
}
// This script is completely hidden from the user. It is at a different domain and outputs nothing.

What am I missing ??!! Any assistance greatly appreciated. Thank you.

[MarkR]

Please do not write your own HTTP implementation.

Use fopen() with the HTTP wrapper instead. It's a lot simpler, and more correct.

EDIT: I'm really not too sure what you're trying to achieve here.

It looks like you're trying to use PHP or RPC, but you're doing something extremely confusing.

Not only is your HTTP implementation potentially incorrect in client.php, but also, you are trying to do a HTTP request in home.php. Why?

In order to return a response from a RPC script, it will be sufficient to echo() it. Nothing more. Your server certainly doesn't need to behave as a HTTP client.

I suspect that your client HTTP implementation is incorrect, and may not be terminating its request in the proper manner. If you feel a burning need to write a HTTP implementation, test it against something simple first. I'd strongly recommend however, that you don't.

It looks like you're trying to send a form-encoded POST. This is good, but I've no idea what you're trying to do in response. You can read the request by using $_POST in home.php and then output the response using echo(). It's not necessary to make the server a client also.

Mark

[bubblenut]

Use [man]Curl[/man], no point in re-inventing the wheel.

[StewardManscat]

There was a reason curl could not be used. I forget that detail.

Thank you Mark. I knew it was simple. RPC is all I want. Or, echo is all I need at one end.

I've become so lost in (vbulletin) community software, I no longer think two numbers can be added without arithmetic templates, operator phrase caching and result permissions.

Will check fopen vs fsockopen, didn't know that. Thanks for that tip.

And thanks for the kick in the butt !