LSL HTTP server/examples

Hello World!

Classic example, the smallest http_request script possible. <lsl> default {

   state_entry()
   {
       llRequestPublicURL();
   }

   http_request(key id, string method, string body)
   {
       if (method == URL_REQUEST_GRANTED)
       {
           llSay(0,"URL: " + body);
       }
       else if (method == "GET")
       {
           llHTTPResponse(id,200,"Hello World!");
       }
   }

} </lsl> A slightly more robust version: <lsl> default {

   state_entry()
   {
       llRequestPublicURL();
   }

   http_request(key id, string method, string body)
   {
       if (method == URL_REQUEST_GRANTED)
       {
           llSay(0,"URL: " + body);
       }
       else if (method == URL_REQUEST_DENIED)
       {
           llSay(0, "Something went wrong, no url. " + body);
       }
       else if (method == "GET")
       {
           llHTTPResponse(id,200,"Hello World!");
       }
       else
       {
           llHTTPResponse(id,405,"Unsupported Method");
       }
   }

} </lsl>

Visitor List

A list of residents within sensor range of the server.
Notes:

• It is cheesy and only handles one request at a time. This was just so the script didn't fill out with list management.

<lsl> key request_id = NULL_KEY;

default {

   state_entry()
   {
       llRequestPublicURL();
   }

   http_request(key id, string method, string body)
   {
       if (method == URL_REQUEST_GRANTED)
       {
           llSay(0,"URL: " + body);
       }
       else if (method == URL_REQUEST_DENIED)
       {
           llSay(0, "Something went wrong, no url. " + body);
       }
       else if (method == "GET")
       {
           if (request_id != NULL_KEY)
           {
               // This is cheesy.
               // Handling multiple requests means list management though.
               llHTTPResponse(id,503,"Sorry, busy right now.\n\tTry again soon.");
           }
           else
           {
               request_id = id;
               llSensor("",NULL_KEY,AGENT,96,PI);
           }
       }
       else
       {
           llHTTPResponse(id,405,"Unsupported method.");
       }
   }

   no_sensor()
   {
       llHTTPResponse(request_id, 200, "There is no one here.");
       request_id = NULL_KEY;
   }

   sensor(integer n)
   {
       string output = "There are " + (string)n + " avatars nearby:";
       integer i;
       for (i = 0;i<n;++i)
       {
           output += "\n\t" + llDetectedName(i);
       }
       llHTTPResponse(request_id,200,output);
       request_id = NULL_KEY;
   }

} </lsl>

Url Persistence

A more complete 'hello world', always has an url and keeps a visitor counter. <lsl> string url; integer hits;

setup() {

   llSetObjectName("HTTP Server");
   url = "";
   llRequestPublicURL();
   hits = (integer)llGetObjectDesc();
   llSetText((string)hits + " visitors.",<1,1,0>,1);

}

default {

   state_entry() { setup(); }
   on_rez(integer n) { setup(); }
   
   changed(integer c)
   {
       if (c & (CHANGED_REGION | CHANGED_REGION_RESTART | CHANGED_TELEPORT) )
       {
           setup();
       }
   }
   
   touch_start(integer n)
   {
       llSay(0,"My url is: " + url);
   }

   http_request(key id, string method, string body)
   {
       if (method == URL_REQUEST_GRANTED)
       {
           url = body;
       }
       else if (method == URL_REQUEST_DENIED)
       {
           llSay(0, "Something went wrong, no url. " + body);
       }
       else if (method == "GET")
       {
           ++hits;
           llSetObjectDesc((string)hits);
           llSetText((string)hits + " visitors.",<1,1,0>,1);
           llHTTPResponse(id,200,"Hello!  You are visitor " + (string)hits + ".");
       }
       else
       {
           llHTTPResponse(id,405,"Method unsupported");
       }
   }

} </lsl>