Xray-core: Dynamic Chrome User-Agent for all HTTP requests by default (overwriteable through config) - #5658

Merged

RPRX merged 28 commits into

mainfrom

copilot/set-default-user-agent

Feb 6, 2026

Commits on Feb 5, 2026

Initial plan
Copilot
committed
feat: set default User-Agent to Chrome with dynamic version based on date

Copilot
and
RPRX
committed
fix: add minimum version constraint for ChromeUA and improve test

Copilot
and
RPRX
committed
refactor: move ChromeUA to utils as var, add UA to XHTTP/WS/HTTPUpgrade/gRPC, revert proxy/http

Copilot
and
RPRX
committed
fix: apply gofmt and remove redundant check in grpc dial

Copilot
and
RPRX
committed
feat: add User-Agent to HTTP proxy client and regular observatory

Copilot
and
RPRX
committed
refactor: rename browserVersion() to ChromeVersion()

Copilot
and
RPRX
committed
fix: remove extra blank lines in burst/ping.go and http/client.go

Copilot
and
RPRX
committed
feat: add version variation to reduce statistical fingerprinting

Copilot
and
RPRX
committed
feat: distribute version transition uniformly across days 15-30

Copilot
and
RPRX
committed
fix: use actual last day of month for version transition distribution

Copilot
and
RPRX
committed
feat: distribute version -1 uniformly before day 15 as well

Copilot
and
RPRX
committed
feat: distribute boundary between -1/+1 zones across days 15-20

Copilot
and
RPRX
committed
feat: add CPU ID to seed for machine-specific distribution

Copilot
and
RPRX
committed
chore: go mod tidy - cpuid is now a direct dependency

Copilot
and
RPRX
committed
feat: simplify to 1/3 probability each for -1/0/+1 version adjustment

Copilot
and
RPRX
committed
fix: restore boundary logic, only apply 1/3 probability after boundary

Copilot
and
RPRX
committed
feat: use CPU features as seed, avoid downgrade after boundary

Copilot
and
RPRX
committed
feat: re-add x+y+z to seed, restore original 1/3 strategy after boundary

Copilot
and
RPRX
committed
feat: change post-boundary to uniformly distributed +1 instead of 1/3

Copilot
and
RPRX
committed
refactor: simplify post-boundary +1 to intuitive 50% chance based on seed

Copilot
and
RPRX
committed
feat: true uniform distribution for post-boundary +1 based on days in range

Copilot
and
RPRX
committed
feat: subtract baseVersion mod 2 to avoid month-end/start version flipping

Copilot
and
RPRX
committed
feat: rewrite ChromeVersion with new strategy - release on 15th, 1-30 day upgrade delay

Copilot
and
RPRX
committed
refactor: simplify ChromeVersion logic - subtract upgrade delay from current date

Copilot
and
RPRX
committed

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Xray-core: Dynamic Chrome User-Agent for all HTTP requests by default (overwriteable through config) - #5658

Xray-core: Dynamic Chrome User-Agent for all HTTP requests by default (overwriteable through config)#5658
RPRX merged 28 commits into
mainfrom
copilot/set-default-user-agent

Commits on Feb 5, 2026

Initial plan

feat: set default User-Agent to Chrome with dynamic version based on date

fix: add minimum version constraint for ChromeUA and improve test

refactor: move ChromeUA to utils as var, add UA to XHTTP/WS/HTTPUpgrade/gRPC, revert proxy/http

fix: apply gofmt and remove redundant check in grpc dial

feat: add User-Agent to HTTP proxy client and regular observatory

refactor: rename browserVersion() to ChromeVersion()

fix: remove extra blank lines in burst/ping.go and http/client.go

feat: add version variation to reduce statistical fingerprinting

feat: distribute version transition uniformly across days 15-30

fix: use actual last day of month for version transition distribution

feat: distribute version -1 uniformly before day 15 as well

feat: distribute boundary between -1/+1 zones across days 15-20

feat: add CPU ID to seed for machine-specific distribution

chore: go mod tidy - cpuid is now a direct dependency

feat: simplify to 1/3 probability each for -1/0/+1 version adjustment

fix: restore boundary logic, only apply 1/3 probability after boundary

feat: use CPU features as seed, avoid downgrade after boundary

feat: re-add x+y+z to seed, restore original 1/3 strategy after boundary

feat: change post-boundary to uniformly distributed +1 instead of 1/3

refactor: simplify post-boundary +1 to intuitive 50% chance based on seed

feat: true uniform distribution for post-boundary +1 based on days in range

feat: subtract baseVersion mod 2 to avoid month-end/start version flipping

feat: rewrite ChromeVersion with new strategy - release on 15th, 1-30 day upgrade delay

refactor: simplify ChromeVersion logic - subtract upgrade delay from current date

Commits on Feb 6, 2026

refactor: simplify ChromeVersion - subtract delay first, then calculate version

feat: change to 45-day release cycle based on Chrome 144 release date (2026.1.13)

feat: new strategy with PRNG seeded by CPU, random 25-45 day intervals from 2026.1.13