signedUrlCacheMaxAgeSec

Maximum number of seconds the response to a signed URL request will be considered fresh. After this time period, the response will be revalidated before being served. Defaults to 1hr (3600s). When serving responses to signed URL requests, Cloud CDN will internally behave as though all responses from this backend had a "Cache-Control: public, max-age=TTL" header, regardless of any existing Cache-Control header. The actual headers served in responses will not be altered.