we have a Julia language calculation engine we want to trigger on command from a HTML webpage.
How can I connect from this application to a Julia instance. Is it possible to connect to Julia via a REST service?
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Hi and welcome to Stack Overflow, please take a time to go through the welcome tour to know your way around here (and also to earn your first badge), read how to create a Minimal, Complete, and Verifiable example and also check How to Ask Good Questions so you increase your chances to get feedback and useful answers.Aoifeee– Aoifeee2020-10-02 21:21:30 +00:00Commented Oct 2, 2020 at 21:21
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2while this question is not perfect the answer provided by Matt B is very useful for others. Maybe it would be better to edit it instead of closing it.Przemyslaw Szufel– Przemyslaw Szufel2020-10-03 12:53:24 +00:00Commented Oct 3, 2020 at 12:53
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1 Answer
You just need to have Julia listening on a port for incoming requests and have it respond accordingly. You can use an HTTP package (like HTTP.jl) to easily set up a REST endpoint:
import HTTP
using Sockets
compute(req::HTTP.Request) = HTTP.Response(200, "hello world")
const SERVER = HTTP.Router()
HTTP.@register(SERVER, "GET", "/test", compute)
HTTP.serve(SERVER, ip"127.0.0.1", 12345)
Now accessing http://127.0.0.1:12345/test should show you a page with the string hello world on it.
There are many frameworks that build atop this basic paradigm.
2 Comments
Higinio Fuentes
If you want to run this in Linux from an address like 163.67.87.54 you need to change ip"127.0.0.1" with ip"0.0.0.0". The call will be: 163.67.87.54:12345/test
mbauman
Yes, 0.0.0.0 will expose the service to the internet, whereas 127.0.0.1 will be localhost-only. Cf. superuser.com/questions/949428/…