Hi All,
Currently nearly all the web of linked data is blocked from access via
client side scripts (javascript) due to CORS [1] being implemented in
the major browsers.
Whilst this is important for all data, there are many of you reading
this who have it in your power to expose huge chunks of the RDF on the
web to JS clients, if you manage any of the common ontologies or
anything in the LOD cloud diagram, please do take a few minutes from
your day to expose the single http header needed.
Long story short, to allow js clients to access our "open" data we need
to add one small HTTP Response header which will allow HEAD/GET and POST
requests - the header is:
Access-Control-Allow-Origin "*"
This is both XMLHttpRequest (W3C) and XDomainRequest (Microsoft)
compatible and supported by all the major browser vendors.
Instructions for common servers follow:
If you're on Apache then you can send this header by simply adding the
following line to a .htaccess file in the dir you want to expose
(probably site-root):
Header add Access-Control-Allow-Origin "*"
For NGINX:
add_header Access-Control-Allow-Origin "*";
see: http://wiki.nginx.org/NginxHttpHeadersModule
For IIS see:
http://technet.microsoft.com/en-us/library/cc753133(WS.10).aspx
In PHP you add the following line before any output has been sent from
the server with:
header("Access-Control-Allow-Origin", "*");
For anything else you'll need to check the relevant docs I'm afraid.
Best & TIA,
Nathan
[1] http://dev.w3.org/2006/waf/access-control/
