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nginx: honour X-Force-Refresh header for per-request cache bypass #2

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Merged
Robbie1977 merged 2 commits into from
Jun 3, 2026
+10 −1
Merged

nginx: honour X-Force-Refresh header for per-request cache bypass #2

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ae4becc
nginx: honour X-Force-Refresh header for per-request cache bypass
Robbie1977 Jun 3, 2026
e357521
only allow whitelist to update
Robbie1977 Jun 3, 2026
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11 changes: 10 additions & 1 deletion nginx.conf.template
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Original file line number Diff line number Diff line change
Expand Up @@ -71,8 +71,17 @@ http {
proxy_cache_min_uses 1;
proxy_cache_revalidate on;
proxy_cache_methods GET HEAD;
map $request_uri $force_refresh {
# Per-request force-refresh: trusted callers (whitelisted IPs) may send an
# `X-Force-Refresh: true|1|yes|on` header to bypass the cache and write the
# upstream response into the canonical cache slot (proxy_cache_bypass without
# proxy_no_cache). Used by the post-release VFBquery warmup tool to overwrite
# v3-cached entries for every query-type x entity-id tuple, so users never see a cold miss.
# FORCE_CACHE_REFRESH_ON_REQUEST remains as a global "treat every request as a refresh"
# nuclear toggle and supplies the default when the header is absent (or the client is not
# whitelisted).
map "$is_whitelisted_ip:$http_x_force_refresh" $force_refresh {
default ${FORCE_CACHE_REFRESH_ON_REQUEST};
"~*^1:(true|1|yes|on)$" 1;
}

proxy_cache_valid 200 ${CACHE_STALE_TIME};
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