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

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  • Subject: [thredds] CORS on thredds, or more specifically - thredds WMS on worldwindserver.net
  • From: Adam Steer <Adam.Steer@xxxxxxxxxx>
  • Date: Thu, 11 Feb 2016 00:10:27 +0000
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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
===============================