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Explainer
https://github.com/WICG/private-network-access/blob/master/explainer.md

Specificationhttps://wicg.github.io/private-network-access

Design docs
https://docs.google.com/document/d/1x1a1fQLOrcWogK3tpFBgQZQ5ZjcONTvD0IqqXkgrg5I/edit#heading=h.7nki9mck5t64

Summary

Requires that private network requests for subresources from public
websites may only be initiated from a secure context. Examples include
internet to intranet requests and internet to loopback requests. This is a
first step towards fully implementing Private Network Access:
https://wicg.github.io/private-network-access/


------


PNA permission prompt is scheduled to be shipped on M124:
https://chromestatus.com/feature/5954091755241472, we need 3 more
milestones for developers to migrate to permission prompt and exit this
deprecation trial.


Blink componentBlink>SecurityFeature>CORS>PrivateNetworkAccess
<https://bugs.chromium.org/p/chromium/issues/list?q=component:Blink%3ESecurityFeature%3ECORS%3EPrivateNetworkAccess>

TAG reviewhttps://github.com/w3ctag/design-reviews/issues/572

TAG review statusIssues addressed

Chromium Trial NamePrivateNetworkAccessNonSecureContextsAllowed

Link to origin trial feedback summary
https://docs.google.com/spreadsheets/d/1z5ZdCslNCnSVR7TNlUTHjSvunMFmT_9G9NOx8-O78-I/edit?usp=sharing&resourcekey=0-DITlG8tDuFDWHiBUHnlSoQ

Origin Trial documentation link
https://developer.chrome.com/blog/private-network-access-update/

WebFeature UseCounter name
kPrivateNetworkAccessNonSecureContextsAllowedDeprecationTrial

Risks


Interoperability and Compatibility

No interoperability risks. Compatibility risk is small but non-negligible.
UseCounters show ~0.1% of page visit making use of this feature. Direct
outreach to the largest users per UKM data revealed no objections to this
launch. Rolling this deprecation out to beta per the previous I2S resulted
in more feedback about the compatibility risk and the need for a time
extension. See the following doc for an extensive discussion:
https://docs.google.com/document/d/1bpis0QwaA9ZrRFmpPW6LiaPmdwT0UhhUMNsEnU0zfLk/edit


*Gecko*: Positive (https://github.com/mozilla/standards-positions/issues/143)
Tentatively positive, but no formal position yet.

*WebKit*: Positive (
https://lists.webkit.org/pipermail/webkit-dev/2021-May/031837.html)

*Web developers*: Mixed signals (
https://docs.google.com/document/d/1bpis0QwaA9ZrRFmpPW6LiaPmdwT0UhhUMNsEnU0zfLk/edit)
In our recent survey, most of websites are able to migrate if our new
permission prompt can be landed as a way for them to relax mixed content
checks.
https://docs.google.com/spreadsheets/d/1z5ZdCslNCnSVR7TNlUTHjSvunMFmT_9G9NOx8-O78-I/edit?resourcekey=0-DITlG8tDuFDWHiBUHnlSoQ#gid=309953809
------------
Some websites, broadly falling in the category of controller webapps for
IoT devices, find this change incompatible with their use cases. While many
use cases can be solved with specific workarounds, some still require
further engagement.

*Other signals*:

Activation

Developers of non-secure sites that rely upon local servers will need to
upgrade to HTTPS. This might cause some complications, as mixed-content
checks will begin to apply. Chrome carves out HTTP access to loopback (as
perhttps://w3c.github.io/webappsec-secure-contexts/#localhost), which is a
release valve for folks who don't want to go through the effort of
securely-distributing certs for local servers. The initial launch in M92
was delayed due to compatibility risks surfaced during the rollout to beta.
See this doc for a lot more details:
https://docs.google.com/document/d/1bpis0QwaA9ZrRFmpPW6LiaPmdwT0UhhUMNsEnU0zfLk/edit


Security

This change should be security-positive.


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?



Debuggability

When a request is made that violates this restriction and the feature is
not enabled, three things happen: 1. A warning message is logged to the
DevTools console. 2. A deprecation report is filed against the initiator
website's Reporting API, if so configured. 3. An issue is surfaced in the
DevTools Issues panel. Likewise, when the feature is enabled and a request
is blocked, the same happens except that the message logged to the DevTools
console is an error and its text is slightly different. The devtools
network panel shows information about the source and remote address spaces
at play.


Is this feature fully tested by web-platform-tests
<https://chromium.googlesource.com/chromium/src/+/main/docs/testing/web_platform_tests.md>
?Yes

https://wpt.fyi/results/fetch/private-network-access?label=master&label=experimental&aligned


Flag name on chrome://flagsBlockInsecurePrivateNetworkRequests

Finch feature nameNone

Non-finch justificationNone

Requires code in //chrome?False

Tracking bughttps://crbug.com/986744

Launch bughttps://crbug.com/1129801

Estimated milestones
Shipping on desktop 127
OriginTrial desktop last 126
OriginTrial desktop first 94
DevTrial on desktop 86
OriginTrial Android last 126
OriginTrial Android first 94
DevTrial on Android 86

Link to entry on the Chrome Platform Status
https://chromestatus.com/feature/5436853517811712

Links to previous Intent discussionsReady for Trial:
https://groups.google.com/a/chromium.org/g/blink-dev/c/EeGg7TxW6U4/m/7ZvqAqHLAwAJ
Intent to Experiment:
https://groups.google.com/a/chromium.org/g/blink-dev/c/vlDZXlPb00k/m/1421ACiuAAAJ
Intent to Extend Experiment:
https://groups.google.com/a/chromium.org/g/blink-dev/c/JPD001kqeck
Intent to Ship:
https://groups.google.com/a/chromium.org/g/blink-dev/c/JPD001kqeck


This intent message was generated by Chrome Platform Status
<https://chromestatus.com/>.

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