public static HttpResponseMessage QueryDB([HttpTrigger(AuthorizationLevel.Anonymous, "get", "post")] HttpRequestMessage req, ILogger log)
        {
            var collectionVertical = req.GetQueryNameValuePairs().FirstOrDefault(c => string.Compare(c.Key, "collection") == 0).Value;

            _mongoUtility.SetCollection(collectionVertical);
            var allDocuments = _mongoUtility.FindAll();

            var collectionJson = JsonConvert.SerializeObject(allDocuments);
            var response       = new HttpResponseMessage(HttpStatusCode.OK)
            {
                Content = new StringContent(collectionJson, Encoding.UTF8, "application/json")
            };

            return(response);
        }