Pi web API filterExpression format

I’m having trouble using a filter expression in the web api that normally works using AF SDK.

 

Im trying to filter a summary by the value of a different item/attribute. Example filter expression: filterExpression=EQUIP2:ATTR_VALUE>100

 

webid is for a separate EQUIP:ATTR_VALUE

 

shortened url: /piwebapi/streams/{EQUIP1webid}/summary?summaryType=Minimum&startTime=blah&endTime=blah&filterExpression=noted above