[FEATURE] Docs: explain how to deploy WSS in local server with own generated certificate

[ZetsubouCode]

First check

• I added a very descriptive title to this issue.
• I used the GitHub search to find a similar issue and didn't find it.
• I searched the FastAPI documentation, with the integrated search.
• I already searched in Google "How to X in FastAPI" and didn't find any information.
• I already read and followed all the tutorial in the docs and didn't find an answer.
• After submitting this, I commit to:
  • Read open issues with questions until I find 2 issues where I can help someone and add a comment to help there.
  • Or, I already hit the "watch" button in this repository to receive notifications and I commit to help at least 2 people that ask questions in the future.
  • Implement a Pull Request for a confirmed bug.

Description

Hello, i'm having an issue with websocket implementation. In FastAPI Doc there is no explanation how i can do it securely (using wss). I also read the starlette doc about websocket, didn't explain what i need.
I already developing websocket project using ws protocol that exactly the same like in the FastAPI websocket tutorial (im using plain html+javascript for the frontend part). I already able to made the project opened under HTTPS protocol using self signed certificate (OpenSSL) and nginx. But i have no idea how to configure wss in FastAPI.
When i searched how to do it, it's most likely that i also should do the same thing like i did for HTTPS to my WS to be come WSS. There's a example for tornado for configuring WSS, in there i need to set the cert and private key in setting proprety by code. Is that what i supposed to do?
Here is the tornado code that im talking about

tornadio2.server.SocketServer(application, ssl_options={
    "certfile": "server.crt",
    "keyfile":  "server.key",
})

And this is how it look like when i access my project and connect using wss protocol

If i connect using ws protocol, there's no issue

The solution I would like

I would like it to have a section in documentation that explained how to do wss configuration.

Environment

• OS: Linux (Ubuntu 20)
• FastAPI Version : 0.61.1
• Python version: 3.8
• Docker version: 20.10.2

Additional context

I'm new to SSL stuff, so i literally have no idea, even after im able to configure the HTTPS

[ZetsubouCode]

Turns out, i just need to setting the docker file that i used.
I just need add several word in the uvicorn command, like this

uvicorn example:app --port 5000 --ssl-keyfile=./key.pem --ssl-certfile=./cert.pem

The documentation is in starlette.