I was going through my copy of “Nginx HTTP Server, 2nd edition” when I located a typographical error regarding WordPress installations with nginx. I used the errata submission form provided by the publisher to inform them. A few days later, they replied confirming the error and they offered me a complimentary copy of any of their titles. And so I got “Haskell Financial Data Modeling and Predictive Analytics” :)
Thank you Packt Publishing!