public IActionResult Execute([HttpTrigger(AuthorizationLevel.Function, "get", Route = null)] HttpRequest req, ILogger log) { try { var mapKey = req.Query["key"].FirstOrDefault(); var location = _locations.SingleOrDefault(x => x.Key == mapKey); if (location == null) { return(new NotFoundResult()); } var outputBytes = _cache.GetOrCreate(location.Key, entry => _generator.GetImageFor(location.ImageLocation)); return(new FileContentResult(outputBytes, "image/jpeg")); } catch (Exception ex) { log.LogError(ex.ToString()); throw; } }