This is a weird problem and I feel it's hard to create a reproducible example. I'm trying to describe the problem here and let the experts to see if this is possible.
I have some styles defined in styles.css, placed in www folder under my shiny app. I included the css with
tags$head(tags$link(rel = "stylesheet", type = "text/css", href = "styles.css")).
Recently I found after I updated the css it didn't take effect in the shiny app. If I inspect the app html source, open the linked http://127.0.0.1:6132/styles.css it will open the old version. I double checked again and again that I was editing the right css file. However somehow an older version css file is cached somewhere and always was loaded.
Is this possible?