Load balancing

The proxy shares the requests of a service over its instances in turn.

Request 1 goes to instance 1.

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The proxy does load balancing with round-robin over the instances of the service that can get traffic.

What the proxy supports

Subject	Behavior
Clients	HTTP/1.1 and HTTP/2
Websockets	The proxy passes them through.
Retry	A `GET` or `HEAD` with no body whose connection fails gets one retry on another instance.
To the app	HTTP/1.1, with the original `Host` and the proxy headers. See the security model.

Hostnames and routing

The proxy reads the Host header of each request to find the service.

Errors of the proxy

When the proxy answers by itself, the response has an x-ferry-error header.