llHTTPRequest

For anyone trying to figure out llHTTPRequest on the Preview Grid, he's a small adding script I cobbled together tonight that shows off how the basics work:

LSL code:

string geturl = "http://profnano.org/test/math.php";
string tName;
integer listenNumber;
list args;

default
{
    state_entry()
    {
        llSay(0, "Adder ready!");
    }

    touch_start(integer total_number)
    {
        tName = llKey2Name(llDetectedKey(0));
        
        listenNumber = llListen(0, tName, NULL_KEY, "");
        llSay(0, "Please say two numbers, and seperate them by a comma (ex: 1,2)...");
    }
    
    listen(integer channel, string name, key id, string message)
    {
        llSay(0, "Thank you");
        
        args = llParseString2List(message, [","], ["", " "]);
        
        string mathurl = geturl + "?a=" + llList2String(args, 0) + "&b=" + llList2String(args, 1);
        
        llHTTPRequest(mathurl, [HTTP_METHOD, "GET"], "");
        
        llListenRemove(listenNumber);
        
        tName = "";
    }
    
    http_response(key request_id, integer status, list metadata, string body)
    {
        integer x = llSubStringIndex(body, "<answer>") + 8;
        integer y = llSubStringIndex(body, "</answer>") - 1;
        string answer = llGetSubString(body, x, y);
        llSay(0, llList2String(args, 0) + " + " + llList2String(args, 1) + " = " + answer);
        args = [];
    }
}

PHP code:

<?php

	$a = $HTTP_GET_VARS["a"];
	$b = $HTTP_GET_VARS["b"];
	$answer = floatval($a) + floatval($b);

	$xml =	'<?xml version="1.0" encoding="ISO-8859-1"?><math><answer>' .
		strval($answer) . '</answer></math>';
    
	header('Content-type: text/xml');
	echo($xml);
?>

People are welcome to use the URL stuck in the LSL code, it's on my server and I doubt it'll go away any time soon. Have fun!

If LL hasn't given us outgoing XML-RPC, here is a script that *should* be able to build XML-RPC requests using llHTTPRequest (assuming i didn't screw up somewhere, i haven't tested it ).

key request;

key SendRemoteData(key uuid, string StringValue, integer IntValue)
{
	if(StringValue)
		StringValue = "<string>" + StringValue + "</string>";
	else
		StringValue = "<string/>";
	if(uuid != "")
		uuid = "<string>" + (string)uuid + "</string>";
	else
		uuid = "<string/>";
	string body = "<?xml version=\"1.0\"?><methodCall> <methodName>llRemoteData</methodName><params><param><value> <struct><member><name>Channel</name><value>"+ (string)uuid +"</value></member><member><name>IntValue</name><value><int>" + (string)IntValue + "</int></value></member><member><name>StringValue</name><value>" + StringValue +
	"</value></member></struct></value></param></params> </methodCall>";
	return llHTTPRequest("http://xmlrpc.secondlife.com/cgi-bin/xmlrpc.cgi", [HTTP_METHOD, "POST"], body);//$[E10006]$[E10006]$[E10006]
}

default
{
	state_entry()
	{
			request = SendRemoteData("2d0efb26-0287-f25c-9d55-5fd09339ff14", "", 0);
	}
	http_response(key id, integer status, list headers, string body)//comment this out to make it pass though lslint
//	link_message(integer a, integer status, string body, key id)//and uncomment this line.
	{
		if(id == request && status == 200)
		{
			if(!llSubStringIndex(body, "<?xml version=\"1.0\"?>"))
			{
				if(llSubStringIndex(body, "<?xml version=\"1.0\"?><methodResponse><fault>"))
				{//a cleverly crafted (ok not so cleverly crafted) xml-rpc responce can generate an invalid xml responce.
					integer p = llSubStringIndex(body, "<int>");
					@loop;
					integer m = p + 1 + llSubStringIndex(llDeleteSubString(body,0,p), "<int>");
					if(m > p)
					{
						p = m;
						jump loop;
					}
					m = p + 1 + llSubStringIndex(llDeleteSubString(body,0,p), "</int>");
					integer IntValue = (integer)llGetSubString(body, p + 5, m - 1);
					string StringValue = llGetSubString(body, 211, p - 53);
					if(StringValue == "<string/>")
						StringValue = "";
					else
						StringValue = llDeleteSubString(StringValue, -9, 7);
					//Insert your code here
					llOwnerSay(llList2CSV([IntValue, StringValue]));
				}
				else
					;//invalid request
			}
			else
				;//some horrible error
		}
	}
}

So some of my cohorts have found that you can overload with too many requests and get blacklisted (ie: several calls per second for several seconds). This has been confirmed. Can anyone (preferably a Linden heh) provide a stat on how much is too much? It'd be nice to know the limit so we don't all go getting blacklisted.

MM

I'd guess around twenty. I was tooling around with my iTunes controller last night, flipping through songs, and I got the error "Jarod Godel has used too many requests for the area in too little time" or something. (I think it'll reset if you log out and then back in, btw.) May guess is between 10-20 requests within a five minute period. That, however, is not official.

Looks like this implementation is incomplete, since there's no key passed to the request nor returned from it to associate a request with a response.

Does anyone have some examples of what this will allow us to do? If this has anything do with me being able to set my own stuff for sale on my own website (like SLX or something) wooohooo. If not, help me understand.

Strife,

What does your script do? If I understand it right, it lets one object send an XML-RPC request to the channel set up by another object? Assuming the channel UUID has been made available to the sender somehow.

Does off-world XML-RPC exist, as requests going out from SL? Or maybe that's meaningless. Certainly, I can see using HTTP to trigger the scripts that I'm now triggering using email -> .forward -> procmail -> PHP. But that's off-word comms, and I'm wondering if your script is a roundabout way of achieving object-to-object comms at better-than-email speeds.

Though moving my PHP scripts to the web area means I probably will have to start worrying about malformed query and other attacks, which right now I don't have to worry about, since it's triggered by email, which is slightly less public.

Web security isn't my strong point at all

The script i posted will allow the user to create malformed requests. But SL's current implementation also lets you create malformed responces, so i see it as moot (my script shouldn't choke on malformed responces from SL). That said, yes you can use SL to make outgoing XML-RPC requests with this script, but whats the point? If you can send XML-RPC requests you can send raw requests. Parsing XML in SL is a pain (trust me). It wastes bandwidth.

I put this script on my server and tried passing a querystring as you did. Nothing was happening. No response. So I hard coded a response to be sure it was working on my end. And I did get that response back in SL! Cool!

So why the couldnt I pass a simple lil querystring to my webpage? I checked my server logs to see what was happening. And lo and behold the ? in my url/querystring is not being passed by SL!

So is this a bug, or something that LL can turn on and off at will?

http://www.yourdomain.com/mypage?message=Hello
looks like this on my server logs:
http://www.yourdomain.com/mypage message=Hello

I made sure it wasn't just me by passing the same querystring from another page and also typing in the URL with Querystring on Google, then following the link to my page (Google is handy that way).

No problem there. So it must be something LL has done, or maybe it's disabled? I dunno.

Has anyone tried POST yet?

reqkey = llHTTPRequest(URL, [HTTP_METHOD, "POST"], "said=hello");

I get the right CONTENT_LENGTH in the headers, but for some reason PHP doesn't have anything in the $_POST array. Am I missing something?

Oh feep. Well, answered my own question.

Have to use $HTTP_RAW_POST_DATA to get to it, since SL isn't setting CONTENT_TYPE to application/x-www-form-urlencoded. Which is, of course, why Strife's works.

Um, any chance of getting some way to set that?

I was able to get the http request to work for various sites, but no luck with anything at secondlife.com. Is there some special format I need?

from llHTTPRequest