> For us it would be a handy feature if history data could be requested directly
> from a custom page (time range or run based intervals) . Here I am not talking
> about history plots but I am talking about recorded time series data. This way
> we could easily generate useful graphs. For instance, if we measure the voltage
> (constant current) while cooling, we could instantly get the resistance versus
> temperature. Often we would like to 'correlate' recorded slow control data.
> 
> Is it already possible to extract history data the way suggested?

There are sundry hs_read() json rpc methods already implemented in preparation
of writing a javascript based history viewer (did not happen yet).

You can try to use them, they should work, but have not been tested extensively.

To find this stuff:
a) go to the mhttpd "help" page, open the "json rpc schema in text table format", look for the "hs_xxx" methods.
b) also from the "help" page, open "javascript examples- example.html", scroll down to "hs_get_active_events". Press the buttons, they should 
work, look at the source code to see how to call the rpc methods from your own page.

K.O.