public void setAuthcScheme(String authcScheme) {
        this.authcScheme = authcScheme;
    }
Sets the HTTP <b><code>WWW-Authenticate</code></b> header scheme that this filter will use when sending the
HTTP Basic challenge response.  The default value is <code>BASIC</code>.

@param authcScheme the HTTP <code>WWW-Authenticate</code> header scheme that this filter will use when
                   sending the Http Basic challenge response.
@see #sendChallenge
web/src/main/java/org/apache/shiro/web/filter/authc/HttpAuthenticationFilter.java