public ConsulUpdatingListenerBuilder checkMethod(HttpMethod checkMethod) {
        this.checkMethod = requireNonNull(checkMethod, "checkMethod");
        return this;
    }
Sets HTTP method for checking health by Consul agent.
If not set {@code HttpMethod.HEAD} is used by default.

<p>Note that the {@code checkMethod} should be configured with {@link #checkUri(String)}.
Otherwise, the {@link #build()} method will throw an {@link IllegalStateException}.

@param checkMethod the {@link HttpMethod} for checking health of service
consul/src/main/java/com/linecorp/armeria/server/consul/ConsulUpdatingListenerBuilder.java