preserve query string during session Initiator

[Jehan Procaccia]

hello

after going through the shibboleth login process, I loose the browsing 
context query string in the final target
exemple in a web biblio application, in the process of placing a hold on 
a book selected while not yet connected:
https://server.domain.fr/cgi-bin/koha/opac-detail.pl?*biblionumber=74745*
click on "place hold"
https://server.domain.fr/cgi-bin/koha/*opac-reserve.pl?biblionumber=74745* 
(opac-reserve.pl is shib protected)*
*then a intermediary login page appears, with the possibility to login 
with local/internal account or :*
*<p>If you have a shibboleth account,
please <a 
href="https://mediatheques.mines-telecom.fr/Shibboleth.sso/Login?target=https://server.domain.fr/cgi-bin/koha/opac-reserve.pl">click 
here to login</a>.</p>*
*I realize that this hard coded link is where I lose the context of the 
queryString ?*biblionumber=74745
*how can I get that Shibboleth.sso/Login?target dynamically include the 
previous (referer ?) full querystring ?

Thanks .
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