simplify code — use NewRequestWithContext API to create request

.travis.yml

@@ -2,19 +2,17 @@ language: go
 go_import_path: github.com/mailgun/groupcache
 
 os: linux
-dist: trusty
+dist: xenial
 sudo: false
 
 script:
   - go test ./...
 
 go:
-  - 1.10.x
-  - 1.11.x
-  - 1.12.x
   - 1.13.x
   - 1.14.x
   - 1.15.x
+  - 1.17.x
   - master
 
 cache:

http.go

@@ -241,14 +241,11 @@ func (h *httpGetter) makeRequest(ctx context.Context, method string, in *pb.GetR
 		url.QueryEscape(in.GetGroup()),
 		url.QueryEscape(in.GetKey()),
 	)
-	req, err := http.NewRequest(method, u, nil)
+	req, err := http.NewRequestWithContext(ctx, method, u, nil)
 	if err != nil {
 		return err
 	}
 
-	// Pass along the context to the RoundTripper
-	req = req.WithContext(ctx)
-
 	tr := http.DefaultTransport
 	if h.getTransport != nil {
 		tr = h.getTransport(ctx)