[Webkit-unassigned] [Bug 219642] New: Support overriding address space for specific IP addresses in test environments

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=219642

            Bug ID: 219642
           Summary: Support overriding address space for specific IP
                    addresses in test environments
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Tools / Tests
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: titouan at chromium.org

There is no good way to write Web Platform Tests for the CORS-RFC1918 specification [1] without additional support from browsers. This has been discussed in the WPT repo [2], which led me to write an RFC [3].

The gist of the RFC is this: browsers need additional configuration surfaces to override the address space [4] of specific IP addresses, so as to simulate the behavior under test. For example, we would like to test that requests to public IP addresses are unaffected, but there is no way to make requests to e.g. https://example.org from a test runner. Instead, we would like to tell the browser: "please consider 127.0.100.1 to be public" and then make requests against this IP address, which loops back to the WPT server. This override mechanism can take the shape of command-line flags, or preferences, or any mechanism deemed most apt by WebKit developers.

Since the bulk of the implementation work for this RFC rests with browser developers, the WPT maintainers would like input from them, hence this bug.

Does the idea outlined above (and explored in more detail in [3]) sound reasonable?

[1] https://wicg.github.io/cors-rfc1918/
[2] https://github.com/web-platform-tests/wpt/issues/26166
[3] https://github.com/web-platform-tests/rfcs/pull/72
[4] https://wicg.github.io/cors-rfc1918/#address-space

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