title: Send login_hint parameter from Shibboleth (Service provider) to Azure AD (Identity Provider)
body: <p>We installed Shibboleth SP3 on our IIS instance, it works pretty well to have a SSO authentication.</p>
  <p>However, we want to pass a « login_hint » parameter to Azure (our IdP) to ease people with multiple accounts. This way, the login is already set if they are not connected yet and they just have to fill the form with their password.</p>
  <p>Is there a way to pass a query string parameter from the initial http request to the Idp ?</p>
  <p>For example, a user go to <a href="https://sp.server.com/index.html?login_hint=me@mail.com" rel="nofollow noreferrer">https://sp.server.com/index.html?login_hint=me@mail.com</a>, then he is redirected to <a href="https://login.microsoft.com/.." rel="nofollow noreferrer">https://login.microsoft.com/..</a>. Where we want to add this parameter.</p>
  <p>Best regards,</p>
  <p>Pierre Soundirarassou</p>