How to get around 403 Forbidden error with R download.file

Question

I am trying to download multiple files from a website. Im scraping the website to come up with the individual URLs, but when I put the URL's into download.file, I'm getting a 403 forbidden error.

It looks like theres a user validation step on the website, but adding a header doesnt help.

Any help getting around this is appreciated. here's what im trying with one sample URL and file :

headers = c(
  `user-agent` = 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/102.0.5005.61 Safari/537.36'
)

download.file("https://gibsons.civicweb.net/filepro/document/125764/Regular%20Council%20-%2006%20Dec%202022%20-%20Minutes%20-%20Pdf.pdf", 
              "file", 
              mode="wb", 
              headers=headers)```