import clr
clr.AddReference('System.Net')
from System.Net import HttpWebRequest, NetworkCredential
from Spotfire.Dxp.Data.Import import TextFileDataSource, TextDataReaderSettings

readerSettings = TextDataReaderSettings()
readerSettings.Separator = ";"
readerSettings.CultureName = "en-GB"

req = HttpWebRequest.Create("a link to csv file")

user_agent = 'individual user-agent'
req.UserAgent = user_agent
req.Method = "GET"

req.UseDefaultCredentials = True
#req.PreAuthenticate = True
user = Document.Properties["Username"]
password = Document.Properties["Password"]

req.Credentials = NetworkCredential(user, password)

rsp = req.GetResponse()
dSource = TextFileDataSource(rsp.GetResponseStream(),readerSettings)
rsp.Close()

dataManager = Document.Data
dataTable = dataManager.Tables[document.Name]
dataTable.ReplaceData(dSource)