[9.3](backport #6491) Fix checkin endpoint gzip handling#6528
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Detect Content-Encoding: gzip header when validating checkin bodies and uncompress the body if detected. (cherry picked from commit 122fac1)
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ebeahan
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Mar 6, 2026
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What is the problem this PR solves?
Checkin requests did not support "Content-Encoding: gzip" correctly.
How does this PR solve the problem?
Detect
Content-Encoding: gzipheader when validating checkin bodies and uncompress the body if detected.Design Checklist
I have ensured my design is stateless and will work when multiple fleet-server instances are behind a load balancer.I have or intend to scale test my changes, ensuring it will work reliably with 100K+ agents connected.I have included fail safe mechanisms to limit the load on fleet-server: rate limiting, circuit breakers, caching, load shedding, etc.Checklist
I have made corresponding changes to the documentationI have made corresponding change to the default configuration filesI have added tests that prove my fix is effective or that my feature works./changelog/fragmentsusing the changelog toolThis is an automatic backport of pull request Fix checkin endpoint gzip handling #6491 done by Mergify.