diff --git a/client.go b/client.go
index b6af886..054e045 100644
--- a/client.go
+++ b/client.go
@@ -40,6 +40,7 @@ type Client struct {
 	client         *retryablehttp.Client
 	token          string
 	baseURL        *url.URL
+	grafanaURL     *url.URL
 	disableRetries bool
 	limiter        *rate.Limiter
 	UserAgent      string
@@ -59,6 +60,22 @@ type Client struct {
 	UserNotificationRules *UserNotificationRuleService
 }
 
+func NewWithGrafanaURL(base_url, token, grafana_url string) (*Client, error) {
+	if token == "" {
+		return nil, fmt.Errorf("Token required")
+	}
+
+	if base_url == "" {
+		return nil, fmt.Errorf("BaseUrl required")
+	}
+	client, err := newClient(base_url, grafana_url)
+	if err != nil {
+		return nil, err
+	}
+	client.token = token
+	return client, nil
+}
+
 func New(base_url, token string) (*Client, error) {
 	if token == "" {
 		return nil, fmt.Errorf("Token required")
@@ -67,7 +84,7 @@ func New(base_url, token string) (*Client, error) {
 	if base_url == "" {
 		return nil, fmt.Errorf("BaseUrl required")
 	}
-	client, err := newClient(base_url)
+	client, err := newClient(base_url, "")
 	if err != nil {
 		return nil, err
 	}
@@ -75,7 +92,7 @@ func New(base_url, token string) (*Client, error) {
 	return client, nil
 }
 
-func newClient(url string) (*Client, error) {
+func newClient(url, grafana_url string) (*Client, error) {
 	c := &Client{}
 
 	// Configure the HTTP client.
@@ -96,6 +113,12 @@ func newClient(url string) (*Client, error) {
 	if err != nil {
 		return nil, err
 	}
+
+	err = c.setGrafanaURL(grafana_url)
+	if err != nil {
+		return nil, err
+	}
+
 	c.UserAgent = defaultUserAgent
 
 	// Create services. Keep in sync with Client struct
@@ -135,6 +158,18 @@ func (c *Client) setBaseURL(urlStr string) error {
 	return nil
 }
 
+func (c *Client) setGrafanaURL(urlStr string) error {
+	if urlStr != "" {
+		grafanaUrl, err := url.Parse(urlStr)
+		if err != nil {
+			return err
+		}
+		c.grafanaURL = grafanaUrl
+	}
+
+	return nil
+}
+
 func (c *Client) NewRequest(method, path string, opt interface{}) (*retryablehttp.Request, error) {
 	u := *c.baseURL
 	unescaped, err := url.PathUnescape(path)
@@ -147,6 +182,9 @@ func (c *Client) NewRequest(method, path string, opt interface{}) (*retryablehtt
 	reqHeaders := make(http.Header)
 	reqHeaders.Set("Accept", "application/json")
 	reqHeaders.Set("Authorization", c.token)
+	if c.grafanaURL != nil {
+		reqHeaders.Set("X-Grafana-URL", c.grafanaURL.String())
+	}
 	if c.UserAgent != "" {
 		reqHeaders.Set("User-Agent", c.UserAgent)
 	}
@@ -318,3 +356,11 @@ func (c *Client) BaseURL() *url.URL {
 	u := *c.baseURL
 	return &u
 }
+
+func (c *Client) GrafanaURL() *url.URL {
+	if c.grafanaURL == nil {
+		return nil
+	}
+	u := *c.grafanaURL
+	return &u
+}
diff --git a/client_test.go b/client_test.go
index b6b5c96..5efd0c6 100644
--- a/client_test.go
+++ b/client_test.go
@@ -47,6 +47,55 @@ func TestNewClient(t *testing.T) {
 	}
 }
 
+func TestNewClientWithGrafanaURL(t *testing.T) {
+	c, err := NewWithGrafanaURL("base_url", "token", "grafana_url")
+	if err != nil {
+		t.Fatalf("Failed to create client: %v", err)
+	}
+
+	expectedBaseURL := "base_url/" + apiVersionPath
+
+	if c.BaseURL().String() != expectedBaseURL {
+		t.Errorf("NewClient BaseURL is %s, want %s", c.BaseURL().String(), expectedBaseURL)
+	}
+
+	if c.GrafanaURL().String() != "grafana_url" {
+		t.Errorf("NewClient GrafanaURL is %s, want grafana_url", c.GrafanaURL().String())
+	}
+}
+
+func TestCheckRequest(t *testing.T) {
+	c, err := New("base_url", "token")
+	if err != nil {
+		t.Fatalf("Failed to create client: %v", err)
+	}
+
+	req, err := c.NewRequest("GET", "test", nil)
+	if err != nil {
+		t.Fatalf("Failed to create request: %v", err)
+	}
+
+	if req.Header.Get("X-Grafana-URL") != "" {
+		t.Errorf("X-Grafana-URL should not be set: %s", req.Header.Get("X-Grafana-URL"))
+	}
+}
+
+func TestCheckRequestSettingGrafanaURL(t *testing.T) {
+	c, err := NewWithGrafanaURL("base_url", "token", "grafana_url")
+	if err != nil {
+		t.Fatalf("Failed to create client: %v", err)
+	}
+
+	req, err := c.NewRequest("GET", "test", nil)
+	if err != nil {
+		t.Fatalf("Failed to create request: %v", err)
+	}
+
+	if req.Header.Get("X-Grafana-URL") != "grafana_url" {
+		t.Errorf("X-Grafana-URL is not set correctly: %s", req.Header.Get("X-Grafana-URL"))
+	}
+}
+
 func TestCheckResponse(t *testing.T) {
 	c, err := New("base_url", "token")
 	if err != nil {
diff --git a/integration_test.go b/integration_test.go
index 92b16d4..95b0a67 100644
--- a/integration_test.go
+++ b/integration_test.go
@@ -110,7 +110,7 @@ var testIntegrationBody = `{
 	   "mobile_app":{
 		  "title":null,
 		  "message":null
-	   },
+	   }
 	}
  }`
 
diff --git a/on_call_shift_test.go b/on_call_shift_test.go
index a74cedd..9e0f755 100644
--- a/on_call_shift_test.go
+++ b/on_call_shift_test.go
@@ -13,13 +13,15 @@ var byDay = []string{"MO", "FR"}
 var interval = 2
 var users = []string{"U4DNY931HHJS5", "U6RV9WPSL6DFW"}
 
+var until = "2020-09-05T13:00:00"
+
 var testOnCallShift = &OnCallShift{
 	ID:        "OH3V5FYQEYJ6M",
 	TeamId:    "T3HRAP3K3IKOP",
 	Name:      "Test On-Call Shift",
 	Type:      "recurrent_event",
 	Start:     "2020-09-04T13:00:00",
-	Until:     "2020-09-05T13:00:00",
+	Until:     &until,
 	Level:     0,
 	Duration:  7200,
 	Frequency: &frequency,