HTTP server that returns JSON

[mvolkmann]

I've been learning about the http/httpl_server library. I wanted to see if I could implement an HTTP server that takes somewhat random queries through an HTTP query parameter and provides JSON responses.

Step 1 was coming up with a reasonable JSON representation for any term. See lib/json.pl and the tests in lib/json.plt in the GitHub repo linked below.

Step 2 was figuring out how to take a query parameter like q=grandfather,X,Y, translate that to running the query grandfather(X, Y), generate JSON from the solutions, and return it in an HTTP response.

I finally got it all working! See https://github.com/mvolkmann/prolog-examples/blob/main/http_server_scryer.pl.

I'm definitely open to feedback if there's anything I could have done better.

[aarroyoc]

I'm very happy that library(http/http_server) is working for you! Here you have a most complex project that uses it: https://github.com/aarroyoc/diario2/. It's still WIP, the linked blog in the README doesn't use it yet.

About the favicon.ico handler: right now you can define a handler for every path that is not any of the others, which can be used to generate custom 404 pages. Usually, webapps should do that. However, if you don't define anything it shouldn't return an error either because the HTTP server should send a 404 anyway... So maybe that's a bug.