backend staticcheck fixes and add Server header

backend/handlers.go

@@ -130,11 +130,11 @@ func makeGatewayCARHandler(bsrv blockservice.BlockService, port int) (*http.Serv
 		const immutableCacheControl = "public, max-age=29030400, immutable"
 		// immutable! CACHE ALL THE THINGS, FOREVER! wolololol
 		w.Header().Set("Cache-Control", immutableCacheControl)
+		w.Header().Set("Server", userAgent)
 
 		// Set modtime to 'zero time' to disable Last-Modified header (superseded by Cache-Control)
 
 		io.Copy(w, carStream)
-		return
 	})
 
 	// Creates metrics handler for total response size. Matches the same metrics
@@ -591,11 +591,11 @@ func makeGatewayBlockHandler(bsrv blockservice.BlockService, port int) (*http.Se
 		const immutableCacheControl = "public, max-age=29030400, immutable"
 		// immutable! CACHE ALL THE THINGS, FOREVER! wolololol
 		w.Header().Set("Cache-Control", immutableCacheControl)
+		w.Header().Set("Server", userAgent)
 
 		// Set modtime to 'zero time' to disable Last-Modified header (superseded by Cache-Control)
 
 		http.ServeContent(w, r, c.String()+".bin", noModtime, bytes.NewReader(blk.RawData()))
-		return
 	})
 
 	// Creates metrics handler for total response size. Matches the same metrics

backend/main.go

@@ -19,8 +19,6 @@ import (
 	"net/http"
 	"os"
 	"os/signal"
-	"strconv"
-	"strings"
 	"sync"
 )
 
@@ -146,31 +144,3 @@ var rootCmd = &cobra.Command{
 		return nil
 	},
 }
-
-func getEnv(key, defaultValue string) string {
-	value := os.Getenv(key)
-	if value == "" {
-		return defaultValue
-	}
-	return value
-}
-
-func getEnvs(key, defaultValue string) []string {
-	value := os.Getenv(key)
-	if value == "" {
-		if defaultValue == "" {
-			return []string{}
-		}
-		value = defaultValue
-	}
-	value = strings.TrimSpace(value)
-	return strings.Split(value, ",")
-}
-
-func getEnvInt(key string, defaultValue int) (int, error) {
-	value := os.Getenv(key)
-	if value == "" {
-		return defaultValue, nil
-	}
-	return strconv.Atoi(value)
-}