add retry interval

src/data/data.rs

@@ -31,7 +31,7 @@ impl PixivData {
     }
 
     /// Read data from JSON object.
-    /// The object is from https://www.pixiv.net/artworks/<id>
+    /// The object is from `https://www.pixiv.net/artworks/<id>`
     /// * `value` - The JSON object
     /// * `allow_overwrite` - Allow overwrite the data existing.
     pub fn from_web_page_data(&mut self, value: &JsonValue, allow_overwrite: bool) {

src/data/json.rs

@@ -135,3 +135,15 @@ impl ToJson for String {
         Some(JsonValue::String(self.to_string()))
     }
 }
+
+impl ToJson for JsonValue {
+    fn to_json(&self) -> Option<JsonValue> {
+        Some(self.clone())
+    }
+}
+
+impl ToJson for &JsonValue {
+    fn to_json(&self) -> Option<JsonValue> {
+        Some((*self).clone())
+    }
+}