Spring Config for RestTemplate to use contextPath from Consul

SpringConsulRibbonContextPathConfig.groovy

/**
 * Workaround to let RestTemplate use the contextPath from Consul when calling URLs
 *  (instead of only using the host and port)
 * See https://github.com/spring-cloud/spring-cloud-consul/issues/376
 * 
 * Put this in any spring config class
 */

@Bean
LoadBalancerRequestTransformer consulContextPathTransformer() {
	new LoadBalancerRequestTransformer() {
		@Override
		HttpRequest transformRequest(HttpRequest request, ServiceInstance instance) {
			String contextPath = instance?.server?.metadata?.contextPath
			contextPath ? new ConsulContextPathServiceRequestWrapper(request, contextPath) : request
		}
	}
}

class ConsulContextPathServiceRequestWrapper extends ServiceRequestWrapper {
	final String contextPath

	ConsulContextPathServiceRequestWrapper(ServiceRequestWrapper serviceRequestWrapper, String contextPath) {
		super(serviceRequestWrapper.request, serviceRequestWrapper.instance, serviceRequestWrapper.loadBalancer)
		this.contextPath = contextPath
	}

	@Override
	URI getURI() {
		URI origURI = super.getURI()
		new URIBuilder(origURI).setPath(contextPath + origURI.path).build()
	}
}