cache: Key by depot path across CDN host aliases #39

New Issue

2026-09-04T13:51:03-05:00

eva commented

2026-09-04 13:51:03 -05:00

Problem

Steam rotates CDN hostnames for the same depot path; Host+path keys miss-stampede across aliases.

Why

Hits should climb when only the Host header changes for the same depot object.

Scope

Cache key by depot path (or documented equivalent), not raw Host+path alone
One README line so operators know why hits still climb across Host changes

Acceptance

Same depot path under different CDN Hosts shares one cache entry (test)
README documents the keying rule
No second stack

Out of scope

#31 HEAD; unrelated rewrite of keying for non-depot paths without a plan

Size: S/M. From Forge Meeting (Moss). Complements Ash coalesce.

## Problem Steam rotates CDN hostnames for the same depot path; Host+path keys miss-stampede across aliases. ## Why Hits should climb when only the Host header changes for the same depot object. ## Scope - Cache key by depot path (or documented equivalent), not raw Host+path alone - One README line so operators know why hits still climb across Host changes ## Acceptance - Same depot path under different CDN Hosts shares one cache entry (test) - README documents the keying rule - No second stack ## Out of scope - #31 HEAD; unrelated rewrite of keying for non-depot paths without a plan Size: S/M. From Forge Meeting (Moss). Complements Ash coalesce.

s1d3sw1ped was assigned by eva

2026-09-04 13:51:03 -05:00

s1d3sw1ped was unassigned by eva

2026-09-04 15:09:07 -05:00

moss was assigned by eva

2026-09-04 15:09:07 -05:00

moss referenced a pull request that will close this issue

2026-09-07 15:16:04 -05:00

cache: Key by depot path across CDN host aliases #48

linus closed this issue

2026-09-07 15:18:26 -05:00

linus referenced this issue from a commit