Server locators
===============

Source: Webové služby ISDS pro manipulaci s datovými zprávami, version 2.16
    (2011-01-26), Page 5
Source: Provozní řád ISDS, version 2011-02-05, Page 13


Production ISDS instance:
    https://ws1.mojedatovaschranka.cz/DS/

Non-normative: Testing ISDS instance base URL:
    https://ws1.czebox.cz/DS/


Different log-in methods requires different URL infixes:

    https://ws1.mojedatovaschranka.cz/DS/
        HTTP basic authentication
    https://ws1c.mojedatovaschranka.cz/cert/DS/
        System certificate authentication
    https://ws1c.mojedatovaschranka.cz/certds/DS/
        Commercial certificate with HTTP basic authentication
    https://ws1c.mojedatovaschranka.cz/hspis/DS/
        Log-in from hosted third party solution by system certificate and
        box ID
