Reproduce a complex curl request with httr2 or httr

Question

I usually scrape web pages with rvest::read_html(); however, this time I want to read an html page using a residential proxy:

Proxy username: username

Proxy password: password

Proxy hostname: geo.iproyal.com (my residential proxy service)

Proxy port: port

Let's also assume that I'm trying to read the following web page: https://ipv4.icanhazip.com

The website for my residential proxy service provide the following curl request which works perfectly:

$ curl -v -x http://username:[email protected]:port -L https://ipv4.icanhazip.com

where $ refers to a bash shell.

My goal is to reproduce this curl request using {httr} or {httr2}. Here is my (failed) attempt:

req <- httr2::request(base_url = url) |>
    httr2::req_proxy(
      url = "geo.iproyal.com",
      port = port,
      username = username,
      password = password,
      auth = "basic"
)

This returns a "403 forbidden" error message.

Thanks in advance for your help.