test: add integration tests for on_demand VHDS with request bodies #42248
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Commit Message:
Add integration tests verifying VHDS on-demand updates work correctly with request bodies for both HTTP/1.1 and HTTP/2. The tests use HttpProtocolIntegrationTest parameterization to automatically run for both downstream protocols (HTTP/1.1 and HTTP/2), ensuring the fix for #17891 works correctly across different HTTP protocol versions.
Additional Description:
Tests verify that:
The test instantiation uses getProtocolTestParamsWithoutHTTP3() which returns parameter combinations for both HTTP/1.1 and HTTP/2 downstream protocols, so each test runs multiple times (once per protocol combination).
Complements the unit tests in d39afea and provides end-to-end verification for #17891.
followup of #42158
Risk Level:
Testing:
Docs Changes:
Release Notes:
Platform Specific Features:
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