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How to use python and wix for web development [duplicate]

I'm trying to integrate backend code into a Wix site. Im not too picky about how I want to do this, or what language to write in (ideally, I have a locally-hosted Java code that I'd love to simply call). I wouldn't mind re-writing it in JavaScript though, or another language. But before I decide that I'm confused about my options. I can code but I'm new to the concepts like modules, APIs, & servers.
According to my research, back-end code with Wix is supposed to be easy (or at least do-able and not THAT complicated)....
From this webpage https://support.wix.com/en/article/corvid-calling-server-side-code-from-the-front-end-with-web-modules,
"Web modules are exclusive to Corvid and enable you to write functions that run server-side in the backend, and easily call them in your client-side code. With web modules you can import functions from backend into files or scripts in public, knowing they will run server-side. Corvid handles all the client-server communication required to enable this access."
And from this: https://www.sitepoint.com/what-is-wix-code/
"It’s serverless: All this added functionality comes in a serverless environment that lets you get your work done without any of the normal full-stack development headaches.
Just code and go: Wix Code has a built-in, online IDE and backend so you can just add the code you need to your page or your site, publish, and you’re live."
So, I thought they have a backend IDE where I can write backend code directly, or I could call my Java program. But, as I tried doing this and finding tutorials, it seems I can really only do this by calling a public API from the backend...?
https://youtu.be/tuu0D1izrUU
But ive also read (and someone who supposedly has done it before told me this) that Wix integrates with node.js, which is a backend version of JavaScript.
Can I use a Wix domain for a NodeJS app?
But, when I go into my Wix site I cannot find any option for using Node JS, and doing research on that gives me no useful results.
So, I'm thoroughly confused on what the capabilities are here. Can someone help me make sense of this?
Why are there no tutorials showing explicit code in the Corvid backend module? What's stopping me from simply writing my Java program there in a module? Do I really need an API endpoint to call and pass to the front end?
Is Node JS supported or not - has anyone done this before?
Also, in one link above they said everything is "serverless". But if I have to set up my own API endpoint won't I need to set up my own server??

There are basically two ways to go about this, which you seem to have already discovered.
Write your backend code in your Wix site. Indeed, the backend is built on Node.js as you can see here. Using this approach you will have to use JavaScript. As you seem to have found, you write this code in the Backend section of your site in a Web Module. Pros: you don't need to worry about managing a server and all your code is in one place.
Expose your already existing Java code as an API that your Wix site can call using the wix-fetch API. Pros: you don't need to rewrite your code.

Flask Rest API: how to switch to using sockets from AJAX?

I've been trying websocket-client and socketio-client with no luck so far. The broad picture of what I want to accomplish is this:
Currently, I have a Flask Rest API that has both a web front-end and a command line interface, and it handles several different sets of file uploads/downloads. Both communicate with the server using HTTP requests, the web one from JQuery AJAX and the CLI uses python requests. I would like to switch to using sockets so that database changes from one client appear on all of them. I have been able to get Flask-SocketIO working between my JQuery and Flask server, but I'm struggling with getting any client libraries working from the CLI portion. Is there an easy to use python library for sockets similar to requests I should be using for this transition, or am I going in a totally wrong direction with making this switch?
Another option, unsure of the viability, would be to try and keep both the REST API for the CLI and have sockets for the web interface. Sounds very messy though.

After doing a lot of searching and messing around with various libraries, the one that was easiest to get up and running connecting a command line tool with a Flask-SocketIO webapp was socketIO-client.
This repository came in handy for the issues where I was struggling to understand how to correctly use the waits to receive info on the client side.
Once I've finished the project in a few weeks, I will come back and add more details so people finding this in the future can have an easier time getting this set up.

how to build an deep learning image processing server

I am building am application to process user's photo on server. Basically, user upload a photo to the server and do some filtering processing using deep learning model. Once it's done filter, user can download the new photo. The filter program is based on the deep learning algorithm, using torch framework, it runs on python/lua. I currently run this filter code on my local ubuntu machine. Just wonder how to turn this into a web service. I have 0 server side knowledge, I did some research, maybe I should use flask or tornado, or other architecture?

I'd recommend using Django if you are comfortable with python and working with an AWS serviced database! It is pretty intuitive, and a lot of resources and examples are available on the web. For example, here is the file upload documentation.

It does make sense to look at the whole task and how it fits to your actual server, Nginx or Lighttpd or Apache since you are serving static content. If you are going to call a library to create the static content, the integration of your library to your web framework would be simpler if you use Flask but it might be a fit for AWS S3 and Lambda services.
It may be worth it to roughly design the whole site and match your content to the tools at hand.

Django website loads slowely, hosted on apache, using mod_wsgi, any way to make it faster?

I have set up a django website on apache on a AWS micro instance. I had a static webpage designed using Twitters bootstrap hosted on /var/www of apache. When I ported that page to django, I find that apache takes longer to serve that page. I am making use of mod_wsgi to host the application and using apache to serve the static files(css, images, etc.). Is there any other way to make the website load faster, or is there any other server that is better suited for Django web applications?

Generally, anything that requires code to be executed/interpreted is going to be slower than a completely static page.
Some things to think about:
Do you have a database backend to this page? If so, you should make sure everything is indexed correctly.
Is there a lot of python code being executed? Are you doing anything that could be optimised?
If you're just rendering the template it is still going to be expensive, since the template has to be run through the Django rendering engine. My advice would be to cache any static assets that you can. A library like this might help: https://github.com/peterbe/django-static

I answered something similar to this recently check out this stack over flow link
finding out why a webapp is slow when hosted

Developing a RIA with Django - what technology stack?

I need to develop a web application with the following requirements:
Desktop like UI on the client side
Application deployment
Scalability (i.e. distributing the service on multiple servers)
What I thought of so far (as I love Python but haven't done much web development yet):
Django
Fabric (think I've read somewhere it's suited for this)
What I'm missing is:
How to create rich clients (probably need some javascript libraries for that)?
How to distribute the service?

For RIA you need to use some client technology in your templates.
See at Dojo or ExtJs.
ExtJs docs have example of Web Desktop app, but this library is not free for commercial project. I like more Dojo, and it is free.

Rich Internet Application: Javascript to do stuff asynchronously (AJAX). If you want a desktop-like interface on the web, it seems currently CoffeeScript is the way to go. It's a language that compiles into Javascript and adapted for rich interfaces.
Deployment: fabric (I think it's used to deploy Python apps).
Distribution: you deploy the code to one server.If you need to scale it up, you just need some additional servers (of course if you have specific usages like very high load on a database, you'll also need to add more database servers etc. But you get the idea).

using web browser as your client platform?