Quarantine IIS RequestPathBaseTests (RequestPathBase_Split, RequestPathBase_WithDoubleSlashes_Split)

[github-actions]

Failing Test(s)

• Microsoft.AspNetCore.Server.IIS.IISExpress.FunctionalTests.RequestPathBaseTests.RequestPathBase_Split
• Microsoft.AspNetCore.Server.IIS.IISExpress.FunctionalTests.RequestPathBaseTests.RequestPathBase_WithDoubleSlashes_Split

Error Message

Assert.Equal() Failure: Values differ
Expected: 200
Actual:   500

Stacktrace

Details

at Microsoft.AspNetCore.Server.IIS.IISExpress.FunctionalTests.RequestPathBaseTests.RequestPathBase_WithDoubleSlashes_Split(String url, String expectedPathBase, String expectedPath)
  in /_/src/Servers/IIS/IIS/test/Common.FunctionalTests/RequestPathBaseTests.cs:line 78

Logs

Details

[0.316s] RequestPathBaseTests Error: Test threw an exception.
Xunit.Sdk.EqualException: Assert.Equal() Failure: Values differ
Expected: 200
Actual:   500

url: "/%5CSub/App/PathAndPathBase/"
expectedPathBase: "/\Sub/App/PathAndPathBase"
expectedPath: "/"

Server returned HTTP 500 when requesting a URL with backslash-encoded path component under IISExpress.

Build

https://dev.azure.com/dnceng-public/public/_build/results?buildId=1364694

Note

🔒 Integrity filter blocked 12 items

The following items were blocked because they don't meet the GitHub integrity level.

• #65815 search_pull_requests: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• #65817 search_pull_requests: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• #65827 search_pull_requests: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• #65816 search_pull_requests: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• #66130 issue_read: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• #66135 issue_read: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• #40626 search_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• #46028 list_pull_requests: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• #49286 list_pull_requests: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• #54846 list_pull_requests: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• #55092 list_pull_requests: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• #55707 list_pull_requests: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".

To allow these resources, lower min-integrity in your GitHub frontmatter:

tools:
  github:
    min-integrity: approved  # merged | approved | unapproved | none

Generated by Daily Test Quarantine Management · ● 25.1M · ◷

[github-actions]

Investigation

Both RequestPathBase_Split and RequestPathBase_WithDoubleSlashes_Split have failed 6 times in the last 30 days in the IISExpress functional tests (build 1364694).

Failure pattern: Expected: 200, Actual: 500 — the test application returns an HTTP 500 error for the test URLs instead of the expected 200.

Test context: These tests send HTTP requests with backslash-encoded paths (%5c, %5C) to an IIS-hosted test app that splits paths into PathBase and Path. The backslash handling (%5c → \) in URL normalization is the key behavior being tested.

Likely root cause: The 500 response is likely an unhandled exception in the IISExpress test app when processing backslash-encoded path segments. This could be:

1. A regression in URL decoding or PathBase splitting when handling %5c/%5C sequences
2. A timing issue with IISExpress startup or the test app initialization
3. A known flakiness in IISExpress process startup in the CI environment

Recommendation: Check if there were recent changes to the URL decoding path or PathBase splitting logic. Also examine the IISExpress test app's error logs for the 500 responses to identify the specific exception being thrown.

Note

🔒 Integrity filter blocked 12 items

The following items were blocked because they don't meet the GitHub integrity level.

• #65815 search_pull_requests: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• #65817 search_pull_requests: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• #65827 search_pull_requests: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• #65816 search_pull_requests: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• #66130 issue_read: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• #66135 issue_read: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• #40626 search_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• #46028 list_pull_requests: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• #49286 list_pull_requests: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• #54846 list_pull_requests: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• #55092 list_pull_requests: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• #55707 list_pull_requests: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".

To allow these resources, lower min-integrity in your GitHub frontmatter:

tools:
  github:
    min-integrity: approved  # merged | approved | unapproved | none

Generated by Daily Test Quarantine Management · ● 25.1M · ◷