Add a configuration to serve a local directory with a static handler

[ia3andy]

Description

Currently we are suggesting to setup a custom route manually:
https://quarkus.io/guides/http-reference#from-a-local-directory

This would be more elegant and cleaner if it was done in the Quarkus Http using a config

[geoand]

Definitely +1 for this.

P.S. It should be pretty easy to do this.

[ia3andy]

@geoand do you want to add it?

[geoand]

I am pretty sure anyone could do it 😉.

That said, if no one else takes it, I can have a look at some point.

[geoand]

@ia3andy here you go: #39993

[cescoffier]

I commented on the PR - do NOT add multiple static handlers.

All the static handlers rely on the same file resolver, which contains a cache. If you have concurrent access (which you can do as soon as your number of event loops is greater than 1), BOOM.

We would have to verify that the directories do not overlap and that file names are unique (otherwise, the cache won't work).

[geoand]

@cescoffier then our docs which tell people to add one are also wrong.

[cescoffier]

Yes and no - it can work, but it may not either (in the sense it could leak or corrupt).

If your path do not overlap and file names are unique, it is going to work (I still need to check ranges).

[geoand]

If your path do not overlap

You mean that each handler should serve a unique root, correct?

and file names are unique

What does this mean exactly? That different instances of StaticHandler can't serve two totally different files that happen to have the same name?