When does the temporary test header stop working?
GitHub says it will deprecate X-GitHub-Stateless-S2S-Token on November 30, 2026. Eligible apps will receive stateless tokens by default after the rollout, so teams should remove the temporary header after testing both formats.
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GitHub App Installation Tokens Grew to 520 Characters. Audit Every HandoffGitHub's stateless App token rollout is complete. Find fixed-length assumptions in databases, proxies, logs and middleware before the Nov 30 test-header cutoff.
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