Caching of Charts service images are based on the interval of the chart requested. Break down is
interval From 1 To 1 minute expiration is "00:00:20"
interval From 2 To 2 minute expiration is "00:00:40"
interval From 3 To 5 minute expiration is "00:01:00"
interval From 6 To 10 minute expiration is "00:02:00"
if no interval is specified then the default is 5 minutes. Settings are Charts service wide so cache timings cannot be changed/extended etc on the client side request.
What's TRKD API can get fields CLOSE_3M, CLOSE_6M, CLOSE_1Y
Glassfish Metro: resolving JAXB naming conflicts and customizing packages names
Regarding proxy setting in TRKD Knowledge direct API
TRKD (16.9.1.2 JSON Sample Request - Get Quotes) - Access Denied Error
Retrieve financial data of companies trading on other global exchanges