How to access a web service that requires authetication [duplicate]

This question already has answers here: Closed 11 years ago.

Possible Duplicate:

Reading information from a password protected site

I have a webservice that provides data in csv form, based on the url you use to access it. i.e. http://sever.com/parameter1 returns a csv for parameter 1, http://sever.com/parameter1 returns a csv for parameter 2, etc. When I first access the site in my browser, I type in a username and password and can then access any data I want.

The problem arises when I try to import that data into R. I tried this function:

readLines('http://sever.com/parameter1')

But got the following error:

Error in file(con, "r") : cannot open the connection
In addition: Warning message:
In file(con, "r") : cannot open: HTTP status was '401 Unauthorized'

Of course, this is because R doesn't know to pass my username and password along with the request. How do I define these additional parameters in R? Is there any way to add a cookie to the request or something?

Thank you.

/edit: The开发者_如何学JAVA answer here (different question wording wasn't picked up by SO) worked for me:

Reading information from a password protected site

If anyone else has any other advice, please let me know.

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Why don't you use curl to grab the file? That way you can set http headers for username and password:

curl --user name:password http://www.example.com

There is a curl library for R

http://curl.haxx.se/libcurl/r/