Simplify x-forwarded-prefix annotation

internal/ingress/annotations/annotations.go

@@ -99,7 +99,7 @@ type Ingress struct {
 	LoadBalancing      string
 	UpstreamVhost      string
 	Whitelist          ipwhitelist.SourceRange
-	XForwardedPrefix   bool
+	XForwardedPrefix   string
 	SSLCiphers         string
 	Logs               log.Config
 	LuaRestyWAF        luarestywaf.Config

internal/ingress/annotations/xforwardedprefix/main.go

@@ -35,5 +35,5 @@ func NewParser(r resolver.Resolver) parser.IngressAnnotation {
 // Parse parses the annotations contained in the ingress rule
 // used to add an x-forwarded-prefix header to the request
 func (cbbs xforwardedprefix) Parse(ing *extensions.Ingress) (interface{}, error) {
-	return parser.GetBoolAnnotation("x-forwarded-prefix", ing)
+	return parser.GetStringAnnotation("x-forwarded-prefix", ing)
 }

internal/ingress/annotations/xforwardedprefix/main_test.go

@@ -35,13 +35,13 @@ func TestParse(t *testing.T) {
 
 	testCases := []struct {
 		annotations map[string]string
-		expected    bool
+		expected    string
 	}{
-		{map[string]string{annotation: "true"}, true},
-		{map[string]string{annotation: "1"}, true},
-		{map[string]string{annotation: ""}, false},
-		{map[string]string{}, false},
-		{nil, false},
+		{map[string]string{annotation: "true"}, "true"},
+		{map[string]string{annotation: "1"}, "1"},
+		{map[string]string{annotation: ""}, ""},
+		{map[string]string{}, ""},
+		{nil, ""},
 	}
 
 	ing := &extensions.Ingress{