 1= GET https://kvv.imp.fu-berlin.de/Shibboleth.sso/Login?entityID=https://identity.fu-berlin.de/idp-fub-qa
    -> Location-Header: https://identity.fu-berlin.de:9443/idp-fub-qa/profile/SAML2/Redirect/SSO?SAMLResponse=[SAMLResponse]&RelayState=[RelayState]
 2= GET [Location-Header 1]
    -> Set-Cookie: JSESSIONID=[JSESSION-FU]
    -> Location: /idp-fub-qa/profile/SAML2/Redirect/SSO?execution=e1s1
 3= GET [Location-Header 2]
    + Cookie: JSESSIONID=[JSESSION-FU]
 4= POST [Location-Header 2]
    + Body: j_username=[USERNAME]&j_password=[PASSWORD]&_eventId_proceed=
    + Header: Content-Type: application/x-www-form-urlencoded
    + Cookie: JSESSIONID=[JSESSION-FU]
    -> Set-Cookie: shib_idp_session=[SHIB-IDP-SESSION]
    -> Body SAMLResponse-Input-value
 5= POST https://kvv.imp.fu-berlin.de/Shibboleth.sso/SAML2/POST
    + Body: SAMLResponse=[SAML-RESPONSE]
    + Header: Content-Type: application/x-www-form-urlencoded
    -> Set-Cookie: _shibsession_[SESS-NR]: [SESS-VALUE]
 6= https://kvv.imp.fu-berlin.de/sakai-login-tool/container
    + Cookie: _shibsession_[SESS-NR]: [SESS-VALUE]
    -> Set-Cookie: JSESSIONID: [JSESSION-KVV]