Invest in smaller bottles and use the bathroom supplies, such as shampoo, soap, mouthwash, etc., provided by the hotel to keep your toiletry case light.

The service provider filter checks authentication of the service requestor using the supplied signature and a gives a SOAP Fault response in case of none authentication.

The usual APIs such as the Apache SOAP API shown above use concepts central to a particular protocol, such as target URIs and encoding styles in the case of SOAP.