I’m trying to understand why this code works for one provider but not for another

[
  url: "https://ip.smartproxy.com/json",
  connect_options: [
    proxy: {:http, "dc.smartproxy.com", 10001, []},
    transport_opts: [verify: :verify_none],
    proxy_headers: [
      {"Proxy-Authorization", "Basic " <> Base.encode64("username:password")}
    ]
  ],
  retry: false
]
|> Req.get()
# {:error, %Req.TransportError{reason: :closed}}

curl works for both providers:

curl -v -U "username:password" -x "dc.smartproxy.com:10001" "https://ip.smartproxy.com/json"

Is there a verbose option for Req similar to curl --verbose?