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Using Server-Timing for App and CDN Monitoring Charles Vazac @vazac

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Olden days of RUM

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RUM APIs

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Request

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Response

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Response Header Syntax Server-Timing: ; duration=""; description="" Examples: Server-Timing: cache-hit Server-Timing: auth; duration=75 Server-Timing: bytes-on-disk; description=17000 Server-Timing: db; duration=120; description="database access"

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Browser support

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Manual Instrumentation Candidates: 1) Database queries 2) Cache lookups 3) API calls 4) Data transformation / processing 5) Image compression 6) Template rendering 7) etc….

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Privacy & Security

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CORS

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TIMING-ALLOW-ORIGIN: www.example.com

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TIMING-ALLOW-ORIGIN: *

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CDN

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#1 Server-Timing: edge; duration=120

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#2 Server-Timing: origin; description=true -or- Server-Timing: origin; description=false

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#3 Server-Timing: bytes; description=10799

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CDN

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DEMO

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Collection & Compression

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resourcetiming-compression.js

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DEMO

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Future of Server Timing

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Links! Server Timing specification https://w3c.github.io/server-timing/ mPulse: https://www.akamai.com/us/en/products/web-performance/mpulse.jsp Libraries: https://github.com/SOASTA/boomerang https://www.npmjs.com/package/resourcetiming-compression https://github.com/Sage/jsurl https://www.npmjs.com/package/express-middleware-server-timing https://github.com/tpeczek/Lib.AspNetCore.ServerTiming https://github.com/dpogue/rails_server_timings

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Thank You!