static <T, U, R> ContextAwareBiFunction<T, U, R> of(RequestContext context, BiFunction<T, U, R> function) {
        return new DefaultContextAwareBiFunction<>(context, function);
    }
Returns a new {@link ContextAwareBiFunction} that sets the specified {@link RequestContext}
before executing an underlying {@link BiFunction}.
core/src/main/java/com/linecorp/armeria/common/ContextAwareBiFunction.java