throws Exception {
// Arrange
Client client = Client.create();
WebResource webResource = client.resource("http://www.microsoft.com");
Builder builder = webResource.header("ms-version", "1.0");
AccessConditionHeader accessCondition = AccessConditionHeader
.ifMatch("thisIsAETag");
// Act
Builder resultBuilder = PipelineHelpers
.addOptionalSourceAccessConditionHeader(builder,