eb5917e9_shable_Mashup_Response_Caching__Cache_Entry
[0] 8. [Event] A Presto developer creates a mashup that uses several Atom mashables. In the mashup he adds the HTTP Cache-Control header with a value of no-cache to the response of each of the Atom mashable invocations. [Cache Entry] 
When this mashup is used, each Atom mashable will be invoked every single time with no response caching because of the HTTP response headers.
Configuring Mashable/Mashup Response Caching
Cache Entry