Persuading Paste HTTP server to use correct REMOTE_ADDR

Configuring reverse proxy headers was on bottom of my TODO list because I never felt it was important for my applications. Today I tried to fuddle with nginx to pass those headers but it gave me a headache. For sake of reference and because I'm sure many others tripped on this one, here is what I figured out from mailing lists and source code (please inform me of a better, straight forward way if ...