I fixed what I thought was keeping the webapp from working on Android, but then it started segfaulting every time it was started. Eventually I determined this segfault happened whenever haskell code called getaddrinfo. I don't know why. This is particularly weird since I had a demo web server that used getaddrinfo working way back in day 201 real Android wrapup. Anyway, I worked around it by not using getaddrinfo on Android.

Then I spent 3 hours stuck, because the webapp seemed to run, but nothing could connect to the port it was on. Was it a firewall? Was the Haskell threaded runtime's use of accept() broken? I went all the way down to the raw system calls, and back, only to finally notice I had netstat available on my Android. Which showed it was not listening to the port I thought it was!

Seems that ntohs and htons are broken somehow. To get the screenshot, I fixed up the port manually. Have a build running that should work around the issue.

Anyway, the webapp works on Android!