[sldev] Web Textures and error responses: pass error handling into http_response

[SignpostMarv Martin]

Problem: JPEG requested, server refuses or fouls up request. What gets 
displayed ?

Potential solution:

Use an LSL function to request an asset UUID for a given URL.
* key llRequestWebTexture(string url);
* request headers similar to those sent with llHTTPRequest() would be 
sent (thus allowing servers to allow/deny based on the Requesting 
Resident, region of origin etc.)


If the fetch gets a 200, the texture can immediately be used with 
llSetTexture() etc.

Any other code then fires off http_response(), where the request_id 
parameter matches the one returned by llRequestWebTexture().

This would then allow scripts to make intelligent responses based on 
standard HTTP response codes (401, 402, 403) 
http://en.wikipedia.org/wiki/List_of_HTTP_status_codes#4xx_Client_Error


Retaining the ability for the viewer to disable 3rd-party web textures 
would then be switched to not obeying 301/302 redirects.


Caveats:

1) Would require HTTP asset server & viewer to support 301/302 redirects
2) Would likely force LL to impose file size restrictions (no 
multi-megabyte poorly compressed PNG/MNG/aPNG)


~ Marv.
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