feat: Support __Host- prefixed session cookies for sticky sessions#549
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hoffmaen merged 3 commits intocloudfoundry:developfrom Apr 13, 2026
Merged
feat: Support __Host- prefixed session cookies for sticky sessions#549hoffmaen merged 3 commits intocloudfoundry:developfrom
hoffmaen merged 3 commits intocloudfoundry:developfrom
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Summary
__Host--prefixed variants of configured sticky session cookie names (e.g.__Host-JSESSIONID), both in application responses and client requests__Host-) per RFC 6265bis, which mandates this canonical casing for user agents — no case-insensitive matching needed__Host-prefix is handled automatically for every name inrouter.sticky_session_cookie_namesMotivation
The
__Host-cookie prefix ensures that session cookies are bound to the exact origin host and are never sent to subdomains, preventing session cookie leakage to other applications on shared domains. This prefix also enforces that cookies are only set over HTTPS, without aDomainattribute, and withPath=/— supporting it in gorouter's sticky session handling allows applications to leverage these stricter security guarantees while retaining session affinity.Backward Compatibility
Breaking Change? No
Note on AI usage
Parts of this code and tests were developed with assistance from Claude Code (claude-opus-4-20250514).