public String getAuthzScheme() {
        return authzScheme;
    }
Returns the HTTP <b><code>Authorization</code></b> header value that this filter will respond to as indicating
a login request.
<p/>
Unless overridden by the {@link #setAuthzScheme(String) setAuthzScheme(String)} method, the
default value is <code>BASIC</code>.

@return the Http 'Authorization' header value that this filter will respond to as indicating a login request
web/src/main/java/org/apache/shiro/web/filter/authc/HttpAuthenticationFilter.java