public ClientRequestContextBuilder endpointGroup(EndpointGroup endpointGroup) {
        this.endpointGroup = requireNonNull(endpointGroup, "endpointGroup");
        return this;
    }
Sets the {@link EndpointGroup} of the request. If not set, it is auto-generated from the request
authority.
core/src/main/java/com/linecorp/armeria/client/ClientRequestContextBuilder.java