Re: [thredds] CORS on thredds, or more specifically - thredds WMS on worldwindserver.net

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• Subject: Re: [thredds] CORS on thredds, or more specifically - thredds WMS on worldwindserver.net
• From: Adam Steer <Adam.Steer@xxxxxxxxxx>
• Date: Fri, 12 Feb 2016 00:05:39 +0000
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Hi all

I solved my own problem. CORS works for thredds catalogues if I enable a CORS 
filter in tomcat, and comment out the CORS section in threddsConfig.xml.

thredds = 4.5.5 - 20150306.1537
tomcat = 7.0.65.0
OS = CentOS 6.7

Cheers
Adam


> On 11 Feb 2016, at 11:10 AM, Adam Steer <Adam.Steer@xxxxxxxxxx> wrote:
> 
> Hi all
> 
> I’m new at thredds - and diving straight into attempting to get data from a 
> thredds server to appear on worldwindserver.net. I’m failing at googling up a 
> result, so I hope this hasn’t been covered somewhere here recently.
> 
> if I try to add a server at worldwindserver.net with the form:
> 
> http://ip.address/thredds/wms/gb6/ocean_eta_1993_03.nc?service=WMS&version=1.3.0&request=GetCapabilities
> 
> ….worldwindserver.net tells me 'Failed to retrieve WMS capabilities from 
> [URL]:….’.
> 
> I’ve been pursuing the line that it may be a CORS issue, so I’ve followed 
> Apache’s instructions and added the following to webxml:
> ---
> <filter>
>    <filter-name>CorsFilter</filter-name>
>    <filter-class>org.apache.catalina.filters.CorsFilter</filter-class>
>    <init-param>
>      <param-name>cors.allowed.methods</param-name>
>      <param-value>GET</param-value>
>    </init-param>
>    <init-param>
>      <param-name>cors.exposed.headers</param-name>
>      
> <param-value>Access-Control-Allow-Origin,Access-Control-Allow-Credentials</param-value>
>    </init-param>
> 
>  </filter>
>  <filter-mapping>
>    <filter-name>CorsFilter</filter-name>
>    <url-pattern>/*</url-pattern>
>  </filter-mapping>
> 
> ---
> …and enabled the CORS element in threddsConfig.xml:
> ---
>  <CORS>
>    <enabled>true</enabled>
>    <maxAge>1728000</maxAge>
>    <allowedMethods>GET</allowedMethods>
>    <allowedHeaders>*</allowedHeaders>
>    <allowedOrigin>*</allowedOrigin>
>  </CORS>
> ---
> (set allowedHeaders to *, not sure if this is advisable or correct!)
> 
> However, the result from worldwindserver.net is unchanged.
> 
> Also - using this service: http://client.cors-api.appspot.com/client
> 
> …tells me that CORS is not enabled on my thredds catalogue.
> 
> Tomcat is hard restarted after both changes, I’m wondering if there is 
> anywhere else I should look, or make changes.
> 
> …or, does anyone have a thredds catalogue which is successfully serving WMS 
> data to worldwindserver, and is happy to share bits of config files?
> 
> Thanks
> 
> Adam
> 
> 
> ===============================
> Adam Steer
> Earth Systems Data Service Specialist
> National Computational Infrastructure
> Leonard Huxley Building, Mills Road
> The Australian National University
> Canberra, ACT, 0200 Australia
> +61 2 6125 1413
> adam.steer@xxxxxxxxxx
> ===============================
> 
> 
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    • From: Adam Steer