calculus - The integral $intlimits_0^inftyfrac{x^4e^x}{(e^x-1)^2} mathrm{d}x$

How to calculate the following integral $$\int_0^\infty\frac{x^4e^x}{(e^x-1)^2}\mathrm{d}x$$
I would like to solve this integral by means of two different ways: for example, integration by parts and using Residue Theorem.