feat: add True-Client-IP as a custom header to be passed along BAPI

clerk.go

@@ -160,7 +160,8 @@ type Params interface {
 // CustomRequestHeaders contains predefined values that can be
 // used as custom headers in Backend API requests.
 type CustomRequestHeaders struct {
-	Application string
+	Application  string
+	TrueClientIP string
 }
 
 // Apply the custom headers to the HTTP request.
@@ -169,6 +170,7 @@ func (h *CustomRequestHeaders) apply(req *http.Request) {
 		return
 	}
 	req.Header.Add("X-Clerk-Application", h.Application)
+	req.Header.Add("X-Clerk-True-Client-IP", h.TrueClientIP)
 }
 
 // BackendConfig is used to configure a new Clerk Backend.

clerk_test.go

@@ -175,7 +175,8 @@ func TestBackendCall_RequestHeaders(t *testing.T) {
 	path := "/resources"
 	secretKey := "sk_test_123"
 	customHeaders := CustomRequestHeaders{
-		Application: "custom-application",
+		Application:  "custom-application",
+		TrueClientIP: "127.0.0.1",
 	}
 
 	ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
@@ -193,6 +194,7 @@ func TestBackendCall_RequestHeaders(t *testing.T) {
 		assert.Equal(t, fmt.Sprintf("go/%s", sdkVersion), r.Header.Get("X-Clerk-SDK"))
 		// Custom headers are added correctly.
 		assert.Equal(t, customHeaders.Application, r.Header.Get("X-Clerk-Application"))
+		assert.Equal(t, customHeaders.TrueClientIP, r.Header.Get("X-Clerk-True-Client-IP"))
 
 		_, err := w.Write([]byte(`{}`))
 		require.NoError(t, err)