private ApiVersionBean getApiVersionFromStorage(String organizationId, String apiId, String version) {
        ApiVersionBean apiVersion = tryAction(() -> storage.getApiVersion(organizationId, apiId, version));
        if (apiVersion == null) {
            throw ExceptionFactory.apiVersionNotFoundException(apiId, version);
        }
        return apiVersion;
    }
Make sure we've got a valid URL.
manager/api/rest-impl/src/main/java/io/apiman/manager/api/service/ApiService.java