Steps

To check that your proxy configuration is properly read by XWiki and confirm whether the server can access the Internet:

1. Create a Page (for example: Sandbox.ProxyDebug).
2. Edit the Page with the Wiki editor.
3. Insert the following Groovy script to list environment variables and Java system properties:

   {{groovy}}
   println "== Environment Variables =="
   System.getenv().each { name, value -> println "Name: {{{$name}}} = Value {{{$value}}}" }
   println ""
   println "== Java System Properties =="
   System.getProperties().each { name, value -> println "Name: {{{$name}}} = Value {{{$value}}}" }
   {{/groovy}}

4. Insert the following Velocity test to check HTTP connectivity and if your XWiki instance is able to access the Internet:

   == Test HTTP Access ==
   Your XWiki server's IP is:
   {{velocity}}
   $xwiki.getURLContent("http://httpbin.org/ip")
   {{/velocity}}
   
   == Test HTTPS Access ==
   Your XWiki server's IP is:
   {{velocity}}
   $xwiki.getURLContent("https://httpbin.org/ip")
   {{/velocity}}
   

5. Save the Page and notice the information on the Page.

FAQ

Why can’t I execute the script?

You need programming rights to run scripts.

Can I use any other service than the "httpbin" service to test Internet connectivity?

Yes, you can use any other service that returns a valid response over HTTP or HTTPS, including https://www.google.com. Using httpbin.org is convenient because it returns your public IP address, which makes it easy to confirm that the request goes through the proxy.