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-rw-r--r--docs/user_guide/headers.md2
1 files changed, 2 insertions, 0 deletions
diff --git a/docs/user_guide/headers.md b/docs/user_guide/headers.md
index 9681d64..5d7c696 100644
--- a/docs/user_guide/headers.md
+++ b/docs/user_guide/headers.md
@@ -54,6 +54,8 @@ The following headers are currently supported:
- `Cache-Control: no-store`: Skip reading from and writing to the cache
- `Cache-Control: only-if-cached`: Only return results from the cache. If not cached, return a 504
response instead of sending a new request. Note that this may return a stale response.
+- `Cache-Control: stale-if-error`: If an error occurs while refreshing a cached response, use it
+ if it expired by no more than this many seconds ago
- `If-None-Match`: Automatically added for revalidation, if an `ETag` is available
- `If-Modified-Since`: Automatically added for revalidation, if `Last-Modified` is available