Invoke-WebRequest does not save all Cookies in SessionVariable

[UPDATE 2014-04-08] Thanks to Meir I updated the post as the code was missing the definition for the regular expression. Now I corrected that, so the code should work now. In addition, I found out that the apple web server is not serving ‘Set-Cookie’ header according to RFC so I changed the example from to (as we are in Switzerland). Furthermore, keep in mind that even when you request e.g. ‘’ you might be ending up with cookies from ‘’ (as you get redirected). If in doubt use Fiddler to trace the traffic.
[UPDATE 2014-04-08 END]

When you use the Invoke-WebRequest Cmdlet that is available since PowerShell 3.0 you have the option of saving a “WebSession” object via the “-SessionVariable” parameter. This comes in handy when you load web pages that have session state cookies so you can make subsequent and stay in the same session (via the “-WebSession” parameter).

Unfortunately not all cookies returned by web pages are saved into this variable. You can easily observe this behaviour when comparing the “Set-Cookie” header in the response headers with the cookies saved in the session variable:

$Uri = ""
$r = Invoke-WebRequest -Uri $Uri -Method GET -SessionVariable s;

Comment    :
CommentUri :
HttpOnly   : False
Discard    : False
Domain     :
Expired    : False
Expires    : 07.04.2016 11:00:27
Name       : PREF
Path       : /
Port       :
Secure     : False
TimeStamp  : 08.04.2014 11:00:24
Value      : ID=8433f29e7847bc24:FF=0:TM=1396947627:LM=1396947627:S=Gm0Sn_3dalialh6o
Version    : 0

Comment    :
CommentUri :
HttpOnly   : True
Discard    : False
Domain     :
Expired    : False
Expires    : 08.10.2014 11:00:27
Name       : NID
Path       : /
Port       :
Secure     : False
TimeStamp  : 08.04.2014 11:00:24
Value      : 67=B9UgmJrwbNRJQ64FpOnJKNJKiVXtbw81VuwxyQ4bLugd5tX1r3Ocg0ITtWRpI038ru6fJ3qB1ju1f8RcX19Flk-vTZ6T2zcw8BzRehq
Version    : 0

$SetCookieHeader = $r.Headers.'set-cookie';
PREF=ID=8433f29e7847bc24:FF=0:TM=1396947627:LM=1396947627:S=Gm0Sn_3dalialh6o; expires=Thu, 07-Apr-2016 09:00:27 GMT; pa
TZ6T2zcw8BzRehqu4cwmbFYza4d8zAuFYupiMzq8; expires=Wed, 08-Oct-2014 09:00:27 GMT; path=/;; HttpOnly
In order to get all cookie into the SessionVariable you have to extract them from the Set-Cookie header and construct a Cookie header manually similar to this:
function ConvertFrom-SetCookieHeader {
#Define parameters
[string] $SetCookieHeader
$res = @{}
$res.SetCookieSplit = "([^=]+)=([^;]+);\ ";
$SetCookie = $SetCookieHeader; #$r.Headers.'set-cookie';
$SetCookie = $SetCookie.Replace('Secure,', 'Secure=1;').Replace('Secure;', 'Secure=1;');
$SetCookie = $SetCookie.Replace('HTTPOnly,', 'HTTPOnly=1;').Replace('HTTPOnly;', 'HTTPOnly=1;');
$MatchInfo = Select-String -InputObject $SetCookie $res.SetCookieSplit -AllMatches;
$CookieHeader = "";
foreach($Match in $MatchInfo.Matches) {
if(!$Match.Success) { continue; }
$CookieName = $Match.Groups.Value[1].Trim();
$CookieValue = $Match.Groups.Value[2].Trim();
#$CookiePath = $res.CookiePathDefault;
$CookieDomain = $WebHost;
switch($CookieName) {
"version" { break; }
"path" { break; }
"domain" { break; }
"expires" { break; }
"HTTPOnly" { break; }
"Secure" { break; }
default {
Log-Debug $fn ("'{0}' = '{1}'" -f $CookieName, $CookieValue);
if(!$CookieHeader) {
$CookieHeader = ("{0}={1}" -f $CookieName, $CookieValue);
} else {
$CookieHeader += ("; {0}={1}" -f $CookieName, $CookieValue);
} # if
} # switch
} # foreach Match
return $CookieHeader;
} # ConvertFrom-SetCookieHeader


  1. Meir says:

    What should be set in $res variable? The code does not work.

    • Ronald Rink says:

      Hi Meir, you are right. $res is a hashtable that has a key “SetCookieSplit” that holds the regular expression (“([^=]+)=([^;]+);\ “) for match on the Cookie header. I updated the post. Thanks!

      • Meir says:

        Yes, it works, Thank you for your quick response and your effort to help to others.

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