Default scope to register()

[mfalken]

Currently the default scope is "/" which will likely result in failure due to the path restriction. There was some suggestions to revise it around #468 (comment) but it seems not decided yet.

Chrome is happy making it something like "./". I'm not actually sure the difference between './' and new URL('./', scriptURL).href

[jakearchibald]

It should be URL('./', scriptURL).href.

I can imagine service worker registration being part of the script that's included in most pages. If "./" was the default scope users would end up with many ServiceWorkers as they navigate around the site.

[mfalken]

Got it, thanks!

[jungkees]

One thing to clarify is whether we'd want to use script url (rather than the page url) as the base url to parse all the given scope urls (i.e. not only the default scope url). I'd assume so because otherwise we'll have to special case the default value "./" which might confuse authors.

For example, we'd want the following output without the special casing the default value, right?

// example.com/foo/page.html
var sw = navigator.serviceWorker;
sw.register("bar/sw.js"); // scope == "/foo/bar/"
sw.register("bar/sw.js", { scope: "./" }); // scope == "/foo/bar/" (not "/foo/")
sw.register("bar/sw.js", { scope: "baz/" }); // scope == "/foo/bar/baz/" (not "/foo/baz/")

[jungkees]

But if using the page url as the base url seems rather natural in general, I can define something like a max scope initialized to the value of URL('./', scriptURL).href and use this in prose rather than setting the default value in IDL.

[mfalken]

I think it's ok for the default url and base url to be unrelated. ie., the following seems acceptable to me:

// example.com/foo/page.html
sw.register("bar/sw.js"); // scope == "/foo/bar/"
sw.register("bar/sw.js", { scope: "./" }); // scope == "/foo"

Anyway, this should be decided as soon as possible, as changing it later will likely break sites.

[jungkees]

I think it's ok for the default url and base url to be unrelated.

Agreed. The default url for a scope seems more like just a constraint than a general rule for parsing scope urls.

/cc @jakearchibald @slightlyoff @annevk

[jungkees]

The default scope text has been sorted out, and the security condition for checking a scope against the location of the script url has been added: f23c1d4.

[jakearchibald]

Agreed with @mattto's example, spec look good too!

[KenjiBaheux]

Shall this bug be closed?

Spec changes tracking note:

• fixed in Blink (M41 via https://code.google.com/p/chromium/issues/detail?id=445154#c4).

[jungkees]

Yes, it's done! Closing.