Difference between revisions of "Http response"

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m (Identifying case where status code 502 is raised from in-world communications between objects.)
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     }
 
     }
 
}</lsl>
 
}</lsl>
 +
 +
To parse the headers returned:
 +
<lsl>
 +
string php_header_handler(string headers, string returns){
 +
    //This parses php headers seperated by &
 +
   
 +
    //For instance if the webserver posts 'data1=hi&data2=blah' then calling php_header_handler("data1=hi&data2=blah","data1"); would return "hi"
 +
    //Written by MichaelRyan Allen, Unrevoked Clarity
 +
 +
    list p =  llParseString2List(headers,["&"],[]);
 +
    integer n = llGetListLength(p);
 +
    integer i;
 +
    list names;
 +
    list values;
 +
    for(i=0;i!=n;i++){
 +
        list p2 =  llParseString2List(llList2String(p,i),["="],[]);
 +
        names += llList2String(p2,0);
 +
        values += llList2String(p2,1);
 +
    }
 +
 +
    if(llListFindList(names,(list)returns) == -1){
 +
        return "";
 +
    }
 +
    else{
 +
        return llList2String(values,llListFindList(names,(list)returns));
 +
 +
    }
 +
 +
 +
}
 +
</lsl>
 
|helpers
 
|helpers
 
|also_header
 
|also_header

Revision as of 08:01, 11 December 2010

Description

Event: http_response( key request_id, integer status, list metadata, string body ){ ; }

Triggered when task receives a response to one of its llHTTPRequests

• key request_id Matches return from llHTTPRequest
• integer status HTTP code (like 404 or 200)
• list metadata List of HTTP_* constants and attributes
• string body

Specification

Status 415 "Unsupported or unknown Content-Type"

The remote server did reply to your request but the Content-Type of the reply (such as XML, JSON, Atom, RSS, PLS) is not recognised by the LL server and so is not passed back to the script. You can assume that 415 means the server heard your request and did reply.

Status 499

Besides the usual HTTP status codes, SL implements a special status code 499. This code isn't generated by the remote web server but by SL's servers, it can indicate:

  • Request timeout (60 seconds)
  • SSL failure
  • A space was present in the url (escape your URL with llEscapeURL).

Status 502

The proxy server received an invalid response from an upstream server. This error occurs when you send an llHTTPRequest to an object in-world, and it does not reply with an llHTTPResponse.

Constant Type Description
HTTP_BODY_TRUNCATED 0 integer Truncation point in bytes

Examples

<lsl>key http_request_id;

default {

   state_entry()
   {
       http_request_id = llHTTPRequest("url", [], "");
   }
   http_response(key request_id, integer status, list metadata, string body)
   {
       if (request_id == http_request_id)
       {
           llSetText(body, <0,0,1>, 1);
       }
   }

}</lsl>

To parse the headers returned: <lsl> string php_header_handler(string headers, string returns){

   //This parses php headers seperated by &
   
   //For instance if the webserver posts 'data1=hi&data2=blah' then calling php_header_handler("data1=hi&data2=blah","data1"); would return "hi"
   //Written by MichaelRyan Allen, Unrevoked Clarity
   list p =  llParseString2List(headers,["&"],[]);
   integer n = llGetListLength(p);
   integer i;
   list names;
   list values;
   for(i=0;i!=n;i++){
       list p2 =  llParseString2List(llList2String(p,i),["="],[]);
       names += llList2String(p2,0);
       values += llList2String(p2,1);
   }
   if(llListFindList(names,(list)returns) == -1){
       return "";
   }
   else{
       return llList2String(values,llListFindList(names,(list)returns));
   }


} </lsl>

Notes

Parsing Problems

If for some reason while using llHTTPRequest/http_response you are unable to parse a known good RSS feed or some other form of web contents, you will need to work around it outside of SecondLife. This is unlikely to change in the near future since checking the headers requires more overhead at the simulator level.

Unicode

When serving content with UTF-8 characters be sure your server sets the outgoing "Content-Type" header so that it includes "charset=utf-8" otherwise it will be interpreted incorrectly. See W3C:Setting the HTTP charset parameter for further details.

Request Headers

Headers sent by the simulator in the course of calling llHTTPRequest.
Header Description Example data
Connection Connection options close
Cache-Control Maximum response age accepted. max-age=259200
X-Forwarded-For Used to show the IP address connected to through proxies. 127.0.0.1
Via Shows the recipients and protocols used between the User Agent and the server. 1.1 sim10115.agni.lindenlab.com:3128 (squid/2.7.STABLE9)
Content-Length The size of the entity-body, in decimal number of octets. 17
Pragma The message should be forwarded to the server, even if it has a cached version of the data. no-cache
X-SecondLife-Shard The environment the object is in. "Production" is the main grid and "Testing" is the preview grid Production
X-SecondLife-Region The name of the region the object is in, along with the global coordinates of the region's south-west corner Jin Ho (264448, 233984)
X-SecondLife-Owner-Name Legacy name of the owner of the object Zeb Wyler
X-SecondLife-Owner-Key UUID of the owner of the object 01234567-89ab-cdef-0123-456789abcdef
X-SecondLife-Object-Name The name of the object containing the script Object
X-SecondLife-Object-Key The key of the object containing the script 01234567-89ab-cdef-0123-456789abcdef
X-SecondLife-Local-Velocity The velocity of the object 0.000000, 0.000000, 0.000000
X-SecondLife-Local-Rotation The rotation of the object containing the script 0.000000, 0.000000, 0.000000, 1.000000
X-SecondLife-Local-Position The position of the object within the region (173.009827, 75.551231, 60.950001)
User-Agent The user-agent header sent by LSL Scripts. Contains Server version. Second Life LSL/16.05.24.315768 (http://secondlife.com)
Content-Type The media type of the entity body. text/plain; charset=utf-8
Accept-Charset Acceptable character sets from the server. Q being the quality expected when sending the different character sets. utf-8;q=1.0, *;q=0.5
Accept Media types the server will accept. text/*, application/xhtml+xml, application/atom+xml, application/json, application/xml, application/llsd+xml, application/x-javascript, application/javascript, application/x-www-form-urlencoded, application/rss+xml
Accept-Encoding Acceptable content encodings for the server. deflate, gzip
Host The internet host being requested. secondlife.com
  • CGI environments may place the headers into variables by capitalizing the entire name, replacing dashes with underscores, and prefixing the name with "HTTP_", e.g. "X-SecondLife-Object-Name" becomes "HTTP_X_SECONDLIFE_OBJECT_NAME".
  • HTTP header names are case insensitive [1]. Some ISPs may modify the case of header names, as was seen in BUG-5094.

See Also

Functions

•  llHTTPRequest

Deep Notes

Signature

event void http_response( key request_id, integer status, list metadata, string body );