To reproduce these errors:
Example 1—EPUB
- Go to the book The Disobedient Kids and other Czecho-Slovak fairy tales
- Click Download as EPUB in the left nav
- Expected result: You download an EPUB file
- Actual result: "502 Bad Gateway" error message with the notation "nginx/1.13.6"
Example 2—MOBI
- Go to the book At the Mountains of Madness
- Click Download as MOBI in the left nav
- Expected result: You download a MOBI file
- Actual result: "502 Bad Gateway" error message with the notation "nginx/1.13.6"
Example3
- Go to the book The Myths of Mexico & Peru
- Click Choose a Format in the left nav
- Expected result: I'm not exactly sure, but presumably one is offered various formats to select for download.
- Actual result: "502 Bad Gateway" error message with the notation "nginx/1.13.6"
I'm on a Mac with High Sierra 10.13.6, using Chrome Version 73.0.3683.75 (Official Build) (64-bit). I made these tests the morning PT of 3.19.19.