diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..0ca2a00
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,16 @@
+# Binaries for programs and plugins
+*.exe
+*.exe~
+*.dll
+*.so
+*.dylib
+.idea
+
+# Test binary, built with `go test -c`
+*.test
+
+# Output of the go coverage tool, specifically when used with LiteIDE
+*.out
+
+# Dependency directories (remove the comment below to include it)
+# vendor/
diff --git a/http.go b/http.go
index 29ff3fa..cae307c 100644
--- a/http.go
+++ b/http.go
@@ -51,7 +51,7 @@ type httpClient struct {
 
 func newRequest(ctx context.Context, log logger.Logger, addr string, req client.Request, ct string, cf codec.Codec, msg interface{}, opts client.CallOptions) (*http.Request, error) {
 	var tags []string
-	var parameters map[string]map[string]string
+	parameters := map[string]map[string]string{}
 	scheme := "http"
 	method := http.MethodPost
 	body := "*" // as like google api http annotation
@@ -82,9 +82,6 @@ func newRequest(ctx context.Context, log logger.Logger, addr string, req client.
 			tags = t
 		}
 		if k, ok := opts.Context.Value(headerKey{}).([]string); ok && len(k) > 0 {
-			if parameters == nil {
-				parameters = make(map[string]map[string]string)
-			}
 			m, ok := parameters["header"]
 			if !ok {
 				m = make(map[string]string)
@@ -95,9 +92,6 @@ func newRequest(ctx context.Context, log logger.Logger, addr string, req client.
 			}
 		}
 		if k, ok := opts.Context.Value(cookieKey{}).([]string); ok && len(k) > 0 {
-			if parameters == nil {
-				parameters = make(map[string]map[string]string)
-			}
 			m, ok := parameters["cookie"]
 			if !ok {
 				m = make(map[string]string)