Improper integral $\int_{-\infty}^{\infty} \frac{e^{sx}}{1+e^{x}} dx$

Question

I'm having trouble solving this problem and was hoping someone could show me how it's done?

$$\int_{-\infty}^{\infty} \frac{e^{sx}}{1+e^{x}} dx$$ where $0<Re(s)<1$