Http connection refused error with Consul client

[hemantkhurana]

I am using consul client version 1.2.0 in my application. Often I keep seeing connection issue between the Consul client and the local Consul agent/cluster.

Caused by: com.orbitz.consul.ConsulException: Consul request failed at com.orbitz.consul.util.Http.executeCall(Http.java:51) at com.orbitz.consul.util.Http.extract(Http.java:30) at com.orbitz.consul.CatalogClient.getDatacenters(CatalogClient.java:47)

Caused by: java.net.ConnectException: Failed to connect to localhost:8501 at okhttp3.internal.connection.RealConnection.connectSocket(RealConnection.java:240) at okhttp3.internal.connection.RealConnection.connect(RealConnection.java:158) at okhttp3.internal.connection.StreamAllocation.findConnection(StreamAllocation.java:256) at okhttp3.internal.connection.StreamAllocation.findHealthyConnection(StreamAllocation.java:134) at okhttp3.internal.connection.StreamAllocation.newStream(StreamAllocation.java:113) Caused by: java.net.ConnectException: Connection refused (Connection refused) at java.net.PlainSocketImpl.socketConnect(Native Method) at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350) at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206) at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188) at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)

I have verified that the local Consul agent/cluster is up and listening on port 8501. The error sometimes disappears on retries and sometimes I need to reboot my application i.e. destroy the JVM and restart the server to make the problem go away. No changes are made on the Consul itself.

1. Is there any ways to have additional logging for the Http trace or traffic to debug this issue?
2. Are there APIs available to set more Http configurations like ConnectionPool min/max limit, idle timeout etc?