RegisterPolicy adds a custom policy to the proxy.

SupportedPolicies is the collection of policies registered.

First is a policy that selects always the first healthy host in the list order.

HealthCheck is used for performing healthcheck on a collection of upstream hosts and select one based on the policy.

LeastConn is a policy that selects the host with the least connections.

Random is a policy that selects up hosts from a pool at random.

RoundRobin is a policy that selects hosts based on round robin ordering.

Spray is a policy that selects a host from a pool at random.

UpstreamHost represents a single proxy upstream.

Policy decides how a host will be selected from a pool.

HostPool is a collection of UpstreamHosts.

UpstreamHostDownFunc can be used to customize how Down behaves.