api/server/httputils: compile with go < 1.7

Signed-off-by: Antonio Murdaca <runcom@redhat.com>

api/server/httputils/httputils.go

@@ -1,7 +1,6 @@
 package httputils
 
 import (
-	"encoding/json"
 	"fmt"
 	"io"
 	"net/http"
@@ -77,15 +76,6 @@ func ParseForm(r *http.Request) error {
 	return nil
 }
 
-// WriteJSON writes the value v to the http response stream as json with standard json encoding.
-func WriteJSON(w http.ResponseWriter, code int, v interface{}) error {
-	w.Header().Set("Content-Type", "application/json")
-	w.WriteHeader(code)
-	enc := json.NewEncoder(w)
-	enc.SetEscapeHTML(false)
-	return enc.Encode(v)
-}
-
 // VersionFromContext returns an API version from the context using APIVersionKey.
 // It panics if the context value does not have version.Version type.
 func VersionFromContext(ctx context.Context) (ver string) {

api/server/httputils/httputils_write_json.go

@@ -0,0 +1,17 @@
+// +build go1.7
+
+package httputils
+
+import (
+	"encoding/json"
+	"net/http"
+)
+
+// WriteJSON writes the value v to the http response stream as json with standard json encoding.
+func WriteJSON(w http.ResponseWriter, code int, v interface{}) error {
+	w.Header().Set("Content-Type", "application/json")
+	w.WriteHeader(code)
+	enc := json.NewEncoder(w)
+	enc.SetEscapeHTML(false)
+	return enc.Encode(v)
+}

api/server/httputils/httputils_write_json_go16.go

@@ -0,0 +1,16 @@
+// +build go1.6,!go1.7
+
+package httputils
+
+import (
+	"encoding/json"
+	"net/http"
+)
+
+// WriteJSON writes the value v to the http response stream as json with standard json encoding.
+func WriteJSON(w http.ResponseWriter, code int, v interface{}) error {
+	w.Header().Set("Content-Type", "application/json")
+	w.WriteHeader(code)
+	enc := json.NewEncoder(w)
+	return enc.Encode(v)
+}