cas/src/main/java/org/springframework/security/cas/web/CasAuthenticationEntryPoint.java
protected String createRedirectUrl(final String serviceUrl) {
		return CommonUtils.constructRedirectUrl(this.loginUrl,
				this.serviceProperties.getServiceParameter(), serviceUrl,
				this.serviceProperties.isSendRenew(), false);
	}
protected String createRedirectUrl(final String serviceUrl) {
		return CommonUtils.constructRedirectUrl(this.loginUrl,
				this.serviceProperties.getServiceParameter(), serviceUrl,
				this.serviceProperties.isSendRenew(), false);
	}
Constructs the Url for Redirection to the CAS server. Default implementation relies
on the CAS client to do the bulk of the work.

@param serviceUrl the service url that should be included.
@return the redirect url. CANNOT be NULL.