Graphite: Backend querying improvements (#111549)

pkg/tsdb/graphite/graphite.go

@@ -100,7 +100,7 @@ func (s *Service) CallResource(ctx context.Context, req *backend.CallResourceReq
 func (s *Service) createRequest(ctx context.Context, dsInfo *datasourceInfo, params URLParams) (*http.Request, error) {
 	u, err := url.Parse(dsInfo.URL)
 	if err != nil {
-		return nil, err
+		return nil, backend.DownstreamError(err)
 	}
 
 	if params.SubPath != "" {
@@ -125,7 +125,7 @@ func (s *Service) createRequest(ctx context.Context, dsInfo *datasourceInfo, par
 	req, err := http.NewRequestWithContext(ctx, method, u.String(), params.Body)
 	if err != nil {
 		s.logger.Info("Failed to create request", "error", err)
-		return nil, fmt.Errorf("failed to create request: %w", err)
+		return nil, backend.PluginError(fmt.Errorf("failed to create request: %w", err))
 	}
 
 	for k, v := range params.Headers {