Network Error Logging: Client side measurement of end to end web service reliability
summary
Planet-scale client-side measurement called NEL collects failed and successful request data from browsers and uploads JSON request-log reports to redundant failover collectors hosted in different failure domains. It ships as a Chrome implementation and is a W3C draft; activation requires a successful response with NEL headers and collectors are simple HTTP endpoints. Google uses NEL since 2014 to detect DNS hijacks, BGP route leaks, CDN and protocol deployment bugs; limitations: no traceroutes, unauthenticated reports, and reliance on many client IPs for confidence.
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chapters (8)
- 0:00Introduction and challenges
- 3:35Understanding NEL
- 5:02Activating and configuration
- 7:54Report data and limitations
- 9:39Privacy and usage principles
- 11:00Practical applications
- 13:16Implementation challenges
- 16:43Future work and Q&A
