Support parsing host header with port

[Mgla96]

Fixes #12973

Proposed Changes

• If a request with 'Host' header or host name explicitly contains a port, the activator would fail to parse the name and namespace from the request.

Release Note

Support for parsing name and namespace in activator from a request when 'Host' header or host name contains a port

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: Mgla96 / name: Matt Gottlieb (8162834, 215458c)

[knative-prow]

Hi @Mgla96. Thanks for your PR.

I'm waiting for a knative member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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[psschwei]

/ok-to-test

[codecov]

Codecov Report

Merging #12974 (215458c) into main (33dbc31) will decrease coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main   #12974      +/-   ##
==========================================
- Coverage   86.97%   86.96%   -0.02%     
==========================================
  Files         197      197              
  Lines       14439    14439              
==========================================
- Hits        12559    12557       -2     
- Misses       1583     1585       +2     
  Partials      297      297              

Impacted Files	Coverage Δ
pkg/activator/handler/context_handler.go	97.29% <100.00%> (ø)
pkg/autoscaler/statserver/server.go	77.77% <0.00%> (-1.49%)	⬇️

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[nader-ziada]

thanks @Mgla96

lgtm

[dprotaso]

/lgtm
/approve

[knative-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: dprotaso, Mgla96

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• pkg/activator/OWNERS [dprotaso]

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