Hi Zack,
If you want to try and keep all the code in JavaScript you can look at
http://www.html5rocks.com/en/tutorials/cors/
I use a PHP proxy file here that uses CURL, partly because I had PHP
programmers to help and partly because it avoids compatibility issues
with browsers that can occur with the CORS options.
I'm a GIS guy that learned Web, and I can say the PHP proxy option
doesn't take a lot to implement. It does require that you have PHP on
your Web server.
Anyway, if you're interested in trying this option I attached an example
of the code I use. It has worked well for us for years.
You'd modify it to include your domain names or IPs, and save it in the
root folder of your website.
You would then modify the JavaScript that creates your map to set
OpenLayers.ProxyHost to the URL of the proxy file:
OpenLayers.ProxyHost="http://192.168.0.128:443/testproxy.php?url=";;
I haven't tried the CORS methods described in the link above, but I have
used JSONP to query databases directly and that works well, but that
requires server-side programming as well.
- Ryan
--
Ryan Williams
GIS Analyst / Programmer
PAQ Interactive Inc.
On 6/8/2014 3:29 PM, zach...@stauber.org wrote:
Hello,
I've been able to use OpenLayers to reference a KML file on the same
server as my OpenLayers script, inside an HTML file, but once have it
pointing to a WFS service on a GeoServer that references a PostGIS
table, it gives me the FireFox/FireBug error:
"Cross-Origin Request Blocked: The Same Origin Policy disallows
reading the remote resource at
https://192.168.0.128:6443/geoserver/turner/wfs. This can be fixed by
moving the resource to the same domain or enabling CORS."
Interesting thing is it is all, in fact, on the same server (all same
IP). But the HTML/OpenLayers file is served up via Apache2 on port
443, and the GeoServer is on Tomcat's port 6443. But it will be on
different servers eventually, so regardless I need to get this
working. Can anyone help?
I'm a GIS guy, not a web guy (yet), not a PHP guy, so I've seen some
solutions suggesting a PHP proxy, but I don't understand that, and I'd
rather do it all in JS since I'm already using that for OpenLayers and
supposedly it can all work through JS.
Here's the stuff in my OpenLayers HTML file called earlyvoting2.html:
var earlyabsentee_wfs = new OpenLayers.Layer.Vector("Early Voting",{
strategies: [new OpenLayers.Strategy.Fixed()],
projection: map.displayProjection,
protocol: new OpenLayers.Protocol.WFS({
version: "1.1.0",
srsName: "EPSG:4326",
url: "https://192.168.0.128:6443/geoserver/turner/wfs";,
featureNS: "https://192.168.0.128:6443/geoserver/turner";,
featureType: "brown:earlyabsentee",
})
});
I'm using IP's because I haven't bought a static IP certificate yet,
but for purposes of this post let's say in my intranet 192.168.0.128
is an Ubuntu 14.04 server named Turner, and everything is on it
(PostGIS, Apache2, Tomcat, GeoServer, etc.).
I don't quite understand, since I can bring the same layer in as a WMS
link in a stubbed out OpenLayers page with one layer from the Layer
Preview page in GeoServer, so it does CORS there. But it hates WFS.
-Zack Stauber
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$v) {
$reqfields.="&$k=$v";
}//end foreach
$request = curl_init($url); // initiate curl object
curl_setopt($request, CURLOPT_HEADER, 1); // set to 0 to eliminate header info from response
curl_setopt($request, CURLOPT_RETURNTRANSFER, 1); // Returns response data instead of TRUE(1)
curl_setopt($request, CURLOPT_POST,0);
curl_setopt($request, CURLOPT_POSTFIELDS, $reqfields); // use HTTP POST to send form data
curl_setopt($request, CURLOPT_SSL_VERIFYPEER, FALSE); // uncomment this line if you get no gateway response.
curl_setopt($request, CURLOPT_HTTPAUTH, CURLAUTH_BASIC);
curl_setopt($request, CURLOPT_USERPWD, 'USERNAME:PASSWORD');
//replace USERNAME and PASSWORD with a real username password that is already setup in your geoserver security properties
$post_response = curl_exec($request); // execute curl post and store results in $post_response
$info=curl_getinfo($request);
curl_close ($request); // close curl object)
header(substr($post_response,0,$info['header_size']));
echo substr($post_response,$info['header_size']);
}
/*
* If allowed use curl to proxy to the map server, login, aquire the info, and then echo it back out
*/
if ($allow) {
getMS();
} else {
/*
* Echo the error for when authentication/permission is failed
*/
echo $error;
}//end if
?>
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