HTTPS support for dev server

[asvishnyakov]

Describe the bug
Now there are hardcoded values in both backend and frontend which break https and custom host support when developing application with chainlit.

To Reproduce
Steps to reproduce the behavior:

1. Enable HTTPs and/or custom host using environment variables
2. Try different screnarios

As far as I know:

• Hardcoded http in server, so you receive

Your app is available at http://localhost:8000

chainlit/backend/chainlit/server.py

Lines 89 to 92 in 61143ac

	if host == DEFAULT_HOST:
	url = f"http://localhost:{port}{ROOT_PATH}"
	else:
	url = f"http://{host}:{port}{ROOT_PATH}"

by default even when https enabled. You also will receive "Empty response" error in opened browser page

• Hard coded http://localhost:8000 for dev server in frontend, so you can't debug frontend if https or custom host enabled
  

  chainlit/frontend/src/api/index.ts

  Line 6 in 61143ac

  const devServer = 'http://localhost:8000' + getRouterBasename();

• No e2e tests for these screnarios (https and custom host)

Expected behavior
Both cases should be seamlessly supported

[dosubot]

Hi, @asvishnyakov. I'm Dosu, and I'm helping the chainlit team manage their backlog. I'm marking this issue as stale.

Issue Summary:

• The issue involves hardcoded HTTP values in the Chainlit development server's backend and frontend.
• This limitation affects the support for HTTPS and custom hosts.
• You provided steps to reproduce the issue and noted the lack of end-to-end tests for these scenarios.
• The expected resolution is to enable the development server to support HTTPS and custom host configurations.
• There have been no further comments or updates on this issue.

Next Steps:

• Please let us know if this issue is still relevant to the latest version of the chainlit repository by commenting here.
• If there is no further activity, this issue will be automatically closed in 14 days.

Thank you for your understanding and contribution!

[asvishnyakov]

Keep it for a while

[Br1an67]

I'd like to work on this. Fixed the startup URL to detect SSL config and use https://, and made the frontend dev server URL configurable via VITE_API_URL.

PR: #2819