Yes, exactly.

On Thu, Oct 24, 2024 at 8:46 AM Chris Thompson <cth...@chromium.org> wrote:

> I think this would be in Step 10 of Main Fetch (Step 5 is for
> Upgrade-Insecure-Requests):
>>
>> Set request’s current URL
>> <https://fetch.spec.whatwg.org/#concept-request-current-url>’s scheme
>> <https://url.spec.whatwg.org/#concept-url-scheme> to "https" if all of
>> the following conditions are true:
>>
>>    - request’s current URL
>>    <https://fetch.spec.whatwg.org/#concept-request-current-url>’s scheme
>>    <https://url.spec.whatwg.org/#concept-url-scheme> is "http"
>>    - request’s current URL
>>    <https://fetch.spec.whatwg.org/#concept-request-current-url>’s host
>>    <https://url.spec.whatwg.org/#concept-url-host> is a domain
>>    <https://url.spec.whatwg.org/#concept-domain>
>>    - Matching request’s current URL
>>    <https://fetch.spec.whatwg.org/#concept-request-current-url>’s host
>>    <https://url.spec.whatwg.org/#concept-url-host> per Known HSTS Host
>>    Domain Name Matching
>>    <https://www.rfc-editor.org/rfc/rfc6797.html#section-8.2> results in
>>    either a superdomain match with an asserted includeSubDomains directive
>>    or a congruent match (with or without an asserted includeSubDomains
>>     directive) [HSTS] <https://fetch.spec.whatwg.org/#biblio-hsts>; or
>>    DNS resolution for the request finds a matching HTTPS RR per section
>>    9.5
>>    
>> <https://datatracker.ietf.org/doc/html/draft-ietf-dnsop-svcb-https#section-9.5>
>>     of [SVCB] <https://fetch.spec.whatwg.org/#biblio-svcb>. [HSTS]
>>    <https://fetch.spec.whatwg.org/#biblio-hsts> [SVCB]
>>    <https://fetch.spec.whatwg.org/#biblio-svcb>
>>
>> So maybe just add a fourth condition "request's current URL's host is not
> localhost"?
>
>
> On Thu, Oct 24, 2024 at 8:42 AM Eric Lawrence <bay...@gmail.com> wrote:
>
>> > probably makes sense to start by suggesting a change to
>> https://fetch.spec.whatwg.org/#concept-main-fetch,
>> > but the editors there might ask you to write an update to the RFC.
>>
>> I don't think I understand what change to Fetch would be proposed. The
>> section you flagged has two relevant clauses related to HTTPS upgrades:
>>
>>   5. Upgrade request to a potentially trustworthy URL, if appropriate.
>>   6. Upgrade a mixed content request to a potentially trustworthy URL, if
>> appropriate.
>>
>> Notably, [*.]localhost is already a potentially trustworthy URL:
>> https://w3c.github.io/webappsec-secure-contexts/#is-origin-trustworthy,
>> clause #5.
>>
>> ...which implies to me that the behavior I propose is already what Fetch
>> asks for.
>> On Wednesday, October 23, 2024 at 7:12:28 PM UTC-5 Jeffrey Yasskin wrote:
>>
>>> Can you propose a matching change to the relevant standard? It probably
>>> makes sense to start by suggesting a change to
>>> https://fetch.spec.whatwg.org/#concept-main-fetch, but the editors
>>> there might ask you to write an update to the RFC. We can figure out the
>>> cheapest way to get that done if they do ask. There's no need to block
>>> shipping this on getting the updates finished, but the launch process
>>> <https://www.chromium.org/blink/launching-features/#new-feature-prepare-to-ship:~:text=propose%20that%20the%20feature%20migrate%20to%20a%20working%20group>
>>>  does
>>> say to propose it first.
>>>
>>> Jeffrey
>>>
>>> On Wed, Oct 23, 2024 at 2:28 PM 'Eric Lawrence' via blink-dev <
>>> blin...@chromium.org> wrote:
>>>
>>>> *Following up on an earlier thread
>>>> here: 
>>>> https://groups.google.com/u/1/a/chromium.org/g/blink-dev/c/gGHOmFGEzQ0
>>>> <https://groups.google.com/u/1/a/chromium.org/g/blink-dev/c/gGHOmFGEzQ0>*
>>>>
>>>> Contact emails: eri...@microsoft.com
>>>>
>>>> Explainer: None
>>>>
>>>> Specification: HSTS specification is at
>>>> https://datatracker.ietf.org/doc/html/rfc6797; this feature proposes
>>>> an improvement.
>>>>
>>>> Summary
>>>>
>>>> Strict-Transport-Security response headers can cause problems for
>>>> localhost web servers because STS applies host-wide, across all ports. This
>>>> causes compatibility problems for web developers testing locally as well as
>>>> end-users who use software packages that commonly spin up localhost
>>>> webservers for ephemeral reasons (e.g. communication of an auth token from
>>>> a web login to a local software package). If one local listener sets
>>>> Strict-Transport-Security on a localhost response, it will be applied to
>>>> all subsequent localhost requests regardless of port. We resolve this
>>>> problem by ignoring Strict-Transport-Security headers on responses from
>>>> localhost URLs.
>>>>
>>>> Blink component: Internals>Network>DomainSecurityPolicy
>>>> <https://bugs.chromium.org/p/chromium/issues/list?q=component:Internals%3ENetwork%3EDomainSecurityPolicy>
>>>>
>>>> TAG review: None
>>>>
>>>> Risks
>>>>
>>>> Interoperability and Compatibility
>>>>
>>>> The expectation is that this will improve compatibility with services
>>>> that run on localhost by avoiding unexpected interactions across unrelated
>>>> packages.
>>>>
>>>> *Gecko*: Shipped/Shipping
>>>>
>>>> *WebKit*: No signal
>>>>
>>>> *Web developers*: Positive (
>>>> https://issues.chromium.org/issues?q=HSTS%20localhost) Web Developers
>>>> who test their sites locally commonly report problems with
>>>> Strict-Transport-Security headers applying unexpectedly across unrelated
>>>> localhost services under tests.
>>>>
>>>> *Other signals*:
>>>>
>>>> WebView application risks
>>>>
>>>> Does this intent deprecate or change behavior of existing APIs, such
>>>> that it has potentially high risk for Android WebView-based applications?
>>>>
>>>> None
>>>>
>>>>
>>>> Debuggability
>>>>
>>>> HSTS upgrades show in the F12 Network pane as "307 Internal Redirect."
>>>> In the absence of such an upgrade, the 307 is not shown.
>>>>
>>>> Will this feature be supported on all six Blink platforms (Windows,
>>>> Mac, Linux, ChromeOS, Android, and Android WebView)? Yes.
>>>>
>>>> Is this feature fully tested by web-platform-tests
>>>> <https://chromium.googlesource.com/chromium/src/+/main/docs/testing/web_platform_tests.md>
>>>> ? No, HSTS is not tested by Web Platform tests. The change is tested
>>>> by Chrome unit and browser tests.
>>>>
>>>> Flag name on chrome://flags: None
>>>>
>>>> Finch feature name: None
>>>>
>>>> Non-finch justification: None
>>>>
>>>> Requires code in //chrome? All of the functional changes are in /net/
>>>> but tests under /chrome/ require updates to use non 'localhost' test
>>>> endpoints.
>>>>
>>>> Tracking bug https://issues.chromium.org/issues/41251622; CL:
>>>> https://chromium-review.googlesource.com/c/chromium/src/+/5923046
>>>> <https://chromium-review.googlesource.com/c/chromium/src/+/5923046>
>>>>
>>>> Estimated milestones
>>>> Shipping on desktop
>>>> 132
>>>> Shipping on Android
>>>> 132
>>>>
>>>> Anticipated spec changes
>>>>
>>>> Open questions about a feature may be a source of future web compat or
>>>> interop issues. Please list open issues (e.g. links to known github issues
>>>> in the project for the feature specification) whose resolution may
>>>> introduce web compat/interop risk (e.g., changing to naming or structure of
>>>> the API in a non-backward-compatible way).
>>>> None
>>>>
>>>> Link to entry on the Chrome Platform Status:
>>>> https://chromestatus.com/feature/5134293196865536?gate=5113092281991168
>>>>
>>>> Links to previous Intent discussions:
>>>> https://groups.google.com/u/1/a/chromium.org/g/blink-dev/c/gGHOmFGEzQ0
>>>>
>>>>
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>>>> .
>>>>
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>> .
>>
>

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