It may be.  I had not thought of using a parameter on the image src.  It'll 
be interesting to see if it works.
Thank you!

On Thursday, March 16, 2017 at 8:24:02 AM UTC-7, Tom Keffer wrote:
>
> Is this thread 
> <https://groups.google.com/d/msg/weewx-user/CwRLAERrRW0/bAF12-WDDwAJ> 
> helpful?
>
> -tk
>
> On Thu, Mar 16, 2017 at 7:59 AM, Joe Percival <[email protected] 
> <javascript:>> wrote:
>
>> Recently my webhost (bluehost) started adding scripts, without notice or 
>> permission, that institute both page and browser caching which has resulted 
>> in users being presented with old images unless the image name is changed 
>> somehow.
>> I was wondering if there might be a way to do the following:
>> 1)  Have weewx create a unique image name for all the images each time a 
>> report is generated.
>> 2)  Have a method in the template that knows the correct new image names 
>> and creates the appropriate html.
>> 3)  Have a method in FTP that deletes old content before loading new 
>> content to avoid accumulation of old, unused images.
>>
>> regarding #1, if I put cheetah commands inside the configuration file for 
>> image names, will they be executed when reports are generated?  Just 
>> hypothetically, like changing
>>
>> [[[monthrain]]]
>>             plot_type = bar
>>             yscale = None, None, 0.02
>>             [[[[rain]]]]
>>                 aggregate_type = sum
>>                 aggregate_interval = 86400
>>                 label = Rain (daily total)
>>
>> to something like 
>>
>> [[[monthrain$timestamp]]]
>>             plot_type = bar
>>             yscale = None, None, 0.02
>>             [[[[rain]]]]
>>                 aggregate_type = sum
>>                 aggregate_interval = 86400
>>                 label = Rain (daily total)
>>
>>
>>
>> Regarding 3), it seems that RSYNC might do the trick but I have to look 
>> into it more and also determine if bluehost supports it.
>> thanks,
>> joe
>>
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