Added browser chat example

[keroxp]

[ry]

Cool! I realize we don't have tests in the examples directory - but we should - I wonder if you'd be able to provide a basic test for this? Otherwise it's quite likely it will break...

[keroxp]

I've realized that remote modules can't serve file that located on the remote server...

deno --allow-net --allow-read https://deno.land/std/examples/chat/server.ts

It won't work after merged :(

[ry]

@keroxp Can you use import.meta.url to get the location of the html asset?

[keroxp]

@ry No, maybe. There is no way to "open" remote file from local.

// deno -A https://deno.land/std/example/chat/server.ts -> https://deno.land/std/examples/chat/index.html 
// deno -A ./server.ts -> file:///src/deno/std/examples/chat/server.ts
const f = new URL("./index.html", import.meta.url).href;
fetch(f).then(resp => req.respond(resp))

Code above worked for deno -A http://.... but didn't work for deno -a ./server.ts.
Deno.open()doesn't accept http://... and fetch() doesn't file://...

[keroxp]

Additionally I found another bug #4038

[keroxp]

@ry I fixed those problems by hacky way. Would you see the change?

[ry]

Ok thanks - LGTM