Browsers can cache the results of the /custom_component route, leading to confusion when new versions are published

[freddyaboulton]

Describe the bug

This happened to me while I was developing the leaderboard component last week. I don't have screenshots but what happened was the following:

• I had published v0.0.5 and it was on pypi and spaces
• Add a new feature
• Release v0.0.6 on pypi and install on spaces
• Space UI looks as if v0.0.5 is used even though space has 0.0.6 wheel installed. (I know because the feature I added in version 0.0.6 was not show in the UI).
• Scratch head.
• I clear browser cache and everything looks as expected

We should set a Cache-Control: no-cache header so that browsers don't use any cached requests.

Have you searched existing issues? 🔎

• I have searched and found no existing issues

Reproduction

Screenshot

No response

Logs

No response

System Info

gradio 4.27.0

Severity

I can work around it

[pngwn]

I don't think we should set no cache but we could probably set a max age of 5 mins or so?

[pngwn]

We could also look into etags to allow more efficient revalidation.

[freddyaboulton]

Yea makes sense!