diff --git a/release.sh b/release.sh
index 1e19609..ce105fb 100755
--- a/release.sh
+++ b/release.sh
@@ -16,7 +16,7 @@
 
 set -e
 
-VERSION=0.1.2
+VERSION=0.1.3
 GO111MODULE=on
 GOPROXY=https://proxy.golang.org
 
diff --git a/server/server.go b/server/server.go
index 66ff5c2..204bf69 100644
--- a/server/server.go
+++ b/server/server.go
@@ -128,7 +128,7 @@ func (f *FallbackServer) handler(w http.ResponseWriter, r *http.Request) {
 			b, _ = proto.Marshal(st.Proto())
 		}
 
-		log.Println(err)
+		log.Println("Error handling request:", r.RequestURI, "-", err)
 		w.WriteHeader(code)
 		w.Write(b)
 	}
@@ -152,6 +152,7 @@ func (f *FallbackServer) dial() (connection, error) {
 
 // options is a handler for the OPTIONS call that precedes CORS-enabled calls.
 func (f *FallbackServer) options(w http.ResponseWriter, r *http.Request) {
+	log.Println("Incoming OPTIONS for request:", r.RequestURI)
 	w.Header().Add("access-control-allow-credentials", "true")
 	w.Header().Add("access-control-allow-headers", "*")
 	w.Header().Add("access-control-allow-methods", http.MethodPost)
diff --git a/server/util.go b/server/util.go
index 3c334bb..b281ff7 100644
--- a/server/util.go
+++ b/server/util.go
@@ -81,7 +81,7 @@ func prepareHeaders(ctx context.Context, hdr http.Header) context.Context {
 
 	// copy Authorization header
 	if auth := hdr.Get("Authorization"); auth != "" {
-		out["Authorization"] = append([]string{}, auth)
+		out.Set("authorization", auth)
 	}
 
 	// keep x-goog-* headers
diff --git a/server/util_test.go b/server/util_test.go
index 5478c0b..4f29c6b 100644
--- a/server/util_test.go
+++ b/server/util_test.go
@@ -60,7 +60,7 @@ func Test_prepareHeaders(t *testing.T) {
 	hdr.Add("x-goog-api-key", "bar")
 
 	want := map[string][]string{
-		"Authorization":  []string{"Bearer foo"},
+		"authorization":  []string{"Bearer foo"},
 		"x-goog-api-key": []string{"bar"},
 	}