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docs: Superset 6.1 documentation catch-up — batch 4 (#39446)

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Co-authored-by: Superset Dev <dev@superset.apache.org>
Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>
Co-authored-by: Michael S. Molina <70410625+michael-s-molina@users.noreply.github.com>
(cherry picked from commit 979f60a6d4)
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Evan Rusackas
2026-04-29 14:26:09 -04:00
committed by Michael S. Molina
parent 1bff24aa34
commit e33f676b8b
5 changed files with 77 additions and 10 deletions
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docs/admin_docs/configuration/cache.mdx
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@@ -178,6 +178,20 @@ Then on configuration:
WEBDRIVER_AUTH_FUNC = auth_driver
```
## ETag Support for Thumbnails
Thumbnail and screenshot endpoints return `ETag` response headers based on the cached content digest. Clients can use conditional requests to avoid downloading unchanged images:
```
GET /api/v1/chart/42/thumbnail/
If-None-Match: "abc123..."
→ 304 Not Modified (if unchanged)
→ 200 OK (with new image if changed)
```
This is particularly useful for embedded dashboards and external integrations that periodically poll for updated screenshots — unchanged thumbnails return immediately with no payload.
## Distributed Coordination Backend
Superset supports an optional distributed coordination (`DISTRIBUTED_COORDINATION_CONFIG`) for