chao qian added a comment - 2019-12-09 01:23   I also met this problem, my Jenkins environment is in internal network, it need use proxy to connect internet.   Now I can't use zoom plugin to push notifications. 

Jorge Yanes added a comment - 2020-03-27 19:22 - edited I also have this problem. 2020-03-27 18:34:06.404+0000 [id=159] INFO i.j.p.zoom.ZoomNotifyClient#notify: Send notification to https: //applications.zoom.us/addon/v2/jenkins/webhooks/xxxxxxxxxxxxxx_xxxxxxx, message: null 2020-03-27 18:34:27.464+0000 [id=159] SEVERE i.j.p.zoom.ZoomNotifyClient#notify: Error posting to Zoom, url: https: //applications.zoom.us/addon/v2/jenkins/webhooks/xxxxxxxxxxxxxx_xxxxxxx, message: null   At first I thought it was just ignoring the proxy settings on the advanced tab of the plugins management page, and that setting the following java opts could work -Dhttp.proxyHost= "proxy.xxxxxx.com" -Dhttp.proxyPort=3128 -Dhttps.proxyHost= "proxy.xxxxxx.com" -Dhttps.proxyPort=3128 -Dhttp.nonProxyHosts= "localhost|aaaa|aaaa.xxxxxx.com|bbbb|bbbb.xxxxxx.com" but it did not.   I can access the URL both with Chrome and with the following in the Jenkins script console ProxyConfiguration.open( new java.net.URL( "https: //applications.zoom.us/addon/v2/jenkins/webhooks/" )).content I get a 401 error, but that's ok, because this test is not providing the API token.  So it is not a connectivity issue. It is clearly a code problem.   I found the plugin's code [here] ( https://github.com/jenkinsci/zoom-plugin/blob/master/src/main/java/io/jenkins/plugins/zoom/ZoomNotifyClient.java) And it's using the Apache HTTP client to post to the API URL, but it never takes any proxy into account.   Something like this example must be implemented: [Example] ( https://hc.apache.org/httpcomponents-client-4.5.x/httpclient/examples/org/apache/http/examples/client/ClientExecuteProxy.java) There's another explanation here: [Tutorial] ( https://www.tutorialspoint.com/apache_httpclient/apache_httpclient_using_proxy.htm)   If I have time this weekend I might open a pull request. This doesn't seem difficult to do at all.

Jorge Yanes added a comment - 2020-03-28 18:20 - edited Done!  https://github.com/jenkinsci/zoom-plugin/pull/4 It is working for me, I hope they merge it