api: remove cache headers

.travis.yml

@@ -18,6 +18,7 @@ jobs:
       env:
         - lint
       script:
+        - curl -sSfL https://raw.githubusercontent.com/golangci/golangci-lint/master/install.sh | sh -s -- -b ./build/bin v1.30.0
         - go run build/ci.go lint
 
     # These are the latest Go versions.

api/http/server.go

@@ -914,8 +914,6 @@ func (s *Server) HandleGetFile(w http.ResponseWriter, r *http.Request) {
 			respondError(w, r, fmt.Sprintf("cannot resolve %s: %s", uri.Addr, err), http.StatusNotFound)
 			return
 		}
-	} else {
-		w.Header().Set("Cache-Control", "max-age=2147483648, immutable") // url was of type bzz://<hex key>/path, so we are sure it is immutable.
 	}
 
 	log.Debug("handle.get.file: resolved", "ruid", ruid, "key", manifestAddr)

build/ci.go

@@ -260,10 +260,6 @@ func doLint(cmdline []string) {
 	if len(flag.CommandLine.Args()) > 0 {
 		packages = flag.CommandLine.Args()
 	}
-	// Get metalinter and install all supported linters
-	lintcmd := goTool("get", "github.com/golangci/golangci-lint/cmd/golangci-lint")
-	lintcmd.Env = append(lintcmd.Env, "GO111MODULE=off") // do not interfere with project modules
-	build.MustRun(lintcmd)
 
 	// Run fast linters batched together
 	configs := []string{