java.net.UnknownHostException：googleapis

Question

My Spring boot app is able to make calls to Google pub sub APIs and works perfectly as expected but only when it is not behind a proxy.

I am looking to deploy my app in on-premises datacenter which requires proxy to make outbound HTTP call.

1. I used HTTPS_PROXY in my environment.. its not working
2. I used grpc_proxy in my environment.. its not working

Getting this exception

Caused by: java.net.UnknownHostException: pubsub.googleapis.com
    at java.base/java.net.InetAddress$CachedAddresses.get(InetAddress.java:797)
    at java.base/java.net.InetAddress.getAllByName0(InetAddress.java:1505)
    at java.base/java.net.InetAddress.getAllByName(InetAddress.java:1364)
    at java.base/java.net.InetAddress.getAllByName(InetAddress.java:1298)
    at io.grpc.internal.DnsNameResolver$JdkAddressResolver.resolveAddress(DnsNameResolver.java:631)
    at io.grpc.internal.DnsNameResolver.resolveAddresses(DnsNameResolver.java:219)

is there any other way to have proxy injected for google libraries?

Answer 1

Got a solution for this. As mentioned here , we would have to use GRPC_PROXY_EXP .

I gave it this way GRPC_PROXY_EXP=internet.company.com:93 and it worked perfectly fine

Answer 2

grpc-java and many Java HTTP libraries use the Java-standard -Dhttps.proxyHost=HOST / -Dhttps.proxyPort=PORT for configuring use of a proxy server.

You can't configure them with an environment variable. It is common to just pass the -D s on the command line. If you want to configure this globally you can change lib/net.properties in the JRE.