Have the bookeeper keep track of ETag values (where available) and fallback to use the If-Modified-Since request header to avoid refetching unmodified resources even when their caching has expired.
This is useful in cases where immutable resources are not marked as such.
Have the bookeeper keep track of
ETagvalues (where available) and fallback to use theIf-Modified-Sincerequest header to avoid refetching unmodified resources even when their caching has expired.This is useful in cases where immutable resources are not marked as such.