https protocol is not supported? #419
Description
If you forget to set up the DOCKER_HOST you get this error. This should probably fail with a more appropriate error.
And DOCKER_HOST should probably default to unix:///var/run/docker.sock ?
javax.ws.rs.ProcessingException: org.apache.http.conn.UnsupportedSchemeException: https protocol is not supported
at com.github.dockerjava.jaxrs.connector.ApacheConnector.apply(ApacheConnector.java:490)
at org.glassfish.jersey.client.ClientRuntime.invoke(ClientRuntime.java:246)
at org.glassfish.jersey.client.JerseyInvocation$3.call(JerseyInvocation.java:705)
at org.glassfish.jersey.internal.Errors.process(Errors.java:315)
at org.glassfish.jersey.internal.Errors.process(Errors.java:297)
at org.glassfish.jersey.internal.Errors.process(Errors.java:228)
at org.glassfish.jersey.process.internal.RequestScope.runInScope(RequestScope.java:424)
at org.glassfish.jersey.client.JerseyInvocation.invoke(JerseyInvocation.java:701)
at org.glassfish.jersey.client.JerseyInvocation$Builder.method(JerseyInvocation.java:417)
at org.glassfish.jersey.client.JerseyInvocation$Builder.get(JerseyInvocation.java:313)
at com.github.dockerjava.jaxrs.ListImagesCmdExec.execute(ListImagesCmdExec.java:35)
at com.github.dockerjava.jaxrs.ListImagesCmdExec.execute(ListImagesCmdExec.java:17)
at com.github.dockerjava.jaxrs.AbstrDockerCmdExec.exec(AbstrDockerCmdExec.java:53)
at com.github.dockerjava.core.command.AbstrDockerCmd.exec(AbstrDockerCmd.java:29)
at com.whisk.docker.DockerKit$$anonfun$listImages$1.apply(DockerKit.scala:25)
at com.whisk.docker.DockerKit$$anonfun$listImages$1.apply(DockerKit.scala:25)
Caused by: org.apache.http.conn.UnsupportedSchemeException: https protocol is not supported
at org.apache.http.impl.conn.HttpClientConnectionOperator.connect(HttpClientConnectionOperator.java:99)
at org.apache.http.impl.conn.PoolingHttpClientConnectionManager.connect(PoolingHttpClientConnectionManager.java:314)
at org.apache.http.impl.execchain.MainClientExec.establishRoute(MainClientExec.java:357)
at org.apache.http.impl.execchain.MainClientExec.execute(MainClientExec.java:218)
at org.apache.http.impl.execchain.ProtocolExec.execute(ProtocolExec.java:194)
at org.apache.http.impl.execchain.RetryExec.execute(RetryExec.java:85)
at org.apache.http.impl.execchain.RedirectExec.execute(RedirectExec.java:108)
at org.apache.http.impl.client.InternalHttpClient.doExecute(InternalHttpClient.java:186)
at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:72)
at com.github.dockerjava.jaxrs.connector.ApacheConnector.apply(ApacheConnector.java:443)
... 15 more