diff --git a/client.go b/client.go
index 5fe1059..f55315e 100644
--- a/client.go
+++ b/client.go
@@ -138,7 +138,11 @@ func (c *Client) LoginUrlForRequest(r *http.Request) (string, error) {
 	}
 
 	q := u.Query()
-	q.Add("service", sanitisedURLString(service))
+	serviceURLStr, err := sanitisedURLString(service)
+	if err != nil {
+		return "", err
+	}
+	q.Add("service", serviceURLStr)
 	u.RawQuery = q.Encode()
 
 	return u.String(), nil
@@ -158,7 +162,11 @@ func (c *Client) LogoutUrlForRequest(r *http.Request) (string, error) {
 		}
 
 		q := u.Query()
-		q.Add("service", sanitisedURLString(service))
+		serviceURLStr, err := sanitisedURLString(service)
+		if err != nil {
+			return "", err
+		}
+		q.Add("service", serviceURLStr)
 		u.RawQuery = q.Encode()
 	}
 
@@ -187,7 +195,7 @@ func (c *Client) ValidateUrlForRequest(ticket string, r *http.Request) (string,
 func (c *Client) RedirectToLogout(w http.ResponseWriter, r *http.Request) {
 	u, err := c.LogoutUrlForRequest(r)
 	if err != nil {
-		http.Error(w, err.Error(), http.StatusInternalServerError)
+		http.Error(w, err.Error(), http.StatusBadRequest)
 		return
 	}
 
@@ -204,7 +212,7 @@ func (c *Client) RedirectToLogout(w http.ResponseWriter, r *http.Request) {
 func (c *Client) RedirectToLogin(w http.ResponseWriter, r *http.Request) {
 	u, err := c.LoginUrlForRequest(r)
 	if err != nil {
-		http.Error(w, err.Error(), http.StatusInternalServerError)
+		http.Error(w, err.Error(), http.StatusBadRequest)
 		return
 	}
 
diff --git a/go.mod b/go.mod
index d0dfe8a..5fcc70d 100644
--- a/go.mod
+++ b/go.mod
@@ -1,4 +1,4 @@
-module gopkg.in/cas.v2
+module github.com/yy1987316/cas
 
 go 1.12
 
diff --git a/sanitise.go b/sanitise.go
index a2cc17c..f2b1d76 100644
--- a/sanitise.go
+++ b/sanitise.go
@@ -9,9 +9,12 @@ var (
 )
 
 // sanitisedURL cleans a URL of CAS specific parameters
-func sanitisedURL(unclean *url.URL) *url.URL {
-	// Shouldn't be any errors parsing an existing *url.URL
-	u, _ := url.Parse(unclean.String())
+func sanitisedURL(unclean *url.URL) (*url.URL, error) {
+	// Parse maybe occur errors, cause unclean is dealt with requestURL method
+	u, err := url.Parse(unclean.String())
+	if err != nil {
+		return nil, err
+	}
 	q := u.Query()
 
 	for _, param := range urlCleanParameters {
@@ -19,10 +22,14 @@ func sanitisedURL(unclean *url.URL) *url.URL {
 	}
 
 	u.RawQuery = q.Encode()
-	return u
+	return u, nil
 }
 
 // sanitisedURLString cleans a URL and returns its string value
-func sanitisedURLString(unclean *url.URL) string {
-	return sanitisedURL(unclean).String()
+func sanitisedURLString(unclean *url.URL) (string, error) {
+	u, err := sanitisedURL(unclean)
+	if err != nil {
+		return "", err
+	}
+	return u.String(), nil
 }
diff --git a/sanitise_test.go b/sanitise_test.go
new file mode 100644
index 0000000..d15983e
--- /dev/null
+++ b/sanitise_test.go
@@ -0,0 +1,51 @@
+package cas
+
+import (
+	"net/url"
+	"reflect"
+	"testing"
+)
+
+func Test_sanitisedURL(t *testing.T) {
+	type args struct {
+		unclean *url.URL
+	}
+	tests := []struct {
+		name    string
+		args    args
+		want    *url.URL
+		wantErr bool
+	}{
+		{
+			name: "Test the URL Scheme chaos value, cause be dealt with requestURL method",
+			args: args{
+				unclean: &url.URL{
+					Scheme:      "chaos_input_from_header_X-Forwarded-Proto",
+					Opaque:      "",
+					User:        &url.Userinfo{},
+					Host:        "a.b.c",
+					Path:        "/",
+					RawPath:     "/",
+					ForceQuery:  false,
+					RawQuery:    "",
+					Fragment:    "",
+					RawFragment: "",
+				},
+			},
+			want:    nil,
+			wantErr: true,
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got, err := sanitisedURL(tt.args.unclean)
+			if (err != nil) != tt.wantErr {
+				t.Errorf("sanitisedURL() error = %v, wantErr %v", err, tt.wantErr)
+				return
+			}
+			if !reflect.DeepEqual(got, tt.want) {
+				t.Errorf("sanitisedURL() got = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}
diff --git a/service_validate.go b/service_validate.go
index 5754bb2..a9b7f17 100644
--- a/service_validate.go
+++ b/service_validate.go
@@ -99,7 +99,11 @@ func (validator *ServiceTicketValidator) ServiceValidateUrl(serviceURL *url.URL,
 	}
 
 	q := u.Query()
-	q.Add("service", sanitisedURLString(serviceURL))
+	serviceURLStr, err := sanitisedURLString(serviceURL)
+	if err != nil {
+		return "", err
+	}
+	q.Add("service", serviceURLStr)
 	q.Add("ticket", ticket)
 	u.RawQuery = q.Encode()
 
@@ -175,7 +179,11 @@ func (validator *ServiceTicketValidator) ValidateUrl(serviceURL *url.URL, ticket
 	}
 
 	q := u.Query()
-	q.Add("service", sanitisedURLString(serviceURL))
+	serviceURLStr, err := sanitisedURLString(serviceURL)
+	if err != nil {
+		return "", err
+	}
+	q.Add("service", serviceURLStr)
 	q.Add("ticket", ticket)
 	u.RawQuery = q.Encode()