default RequestHeadersBuilder authority(Endpoint endpoint) {
        requireNonNull(endpoint, "endpoint");
        return authority(endpoint.authority());
    }
Sets the {@code ":authority"} header from the specified {@link Endpoint}.

@throws IllegalArgumentException if the specified {@link Endpoint} refers to a group
core/src/main/java/com/linecorp/armeria/common/RequestHeadersBuilder.java