diff --git a/src/effect.ts b/src/effect.ts
index fdceec3..b0ac0c6 100644
--- a/src/effect.ts
+++ b/src/effect.ts
@@ -3,16 +3,16 @@ import type { EditorView, WidgetType } from "@codemirror/view";
 
 export type WidgetInit =
   | { state: "resolving"; url: string }
-  | { state: "resolved"; url: string; src: string }
+  | { state: "resolved"; url: string }
   | { state: "loaded"; url: string }
   | { state: "failed"; url: string; error: Error };
 
-const resolvedEffect = StateEffect.define<{ url: string; src: string }>();
+const resolvedEffect = StateEffect.define<{ url: string }>();
 const failedEffect = StateEffect.define<{ url: string; error: Error }>();
 const loadedEffect = StateEffect.define<{ url: string }>();
 
-export function resolved(view: EditorView, url: string, src: string): void {
-  view.dispatch({ effects: resolvedEffect.of({ url, src }) });
+export function resolved(view: EditorView, url: string): void {
+  view.dispatch({ effects: resolvedEffect.of({ url }) });
 }
 
 export function failed(view: EditorView, url: string, error: Error): void {
@@ -29,10 +29,7 @@ export function* constructWidget<T extends WidgetType>(
 ): Generator<[string, T]> {
   for (const effect of effects) {
     if (effect.is(resolvedEffect)) {
-      yield [
-        effect.value.url,
-        new widget({ state: "resolved", url: effect.value.url, src: effect.value.src }),
-      ];
+      yield [effect.value.url, new widget({ state: "resolved", url: effect.value.url })];
     } else if (effect.is(failedEffect)) {
       yield [
         effect.value.url,
diff --git a/src/embed_source.ts b/src/embed_source.ts
index 0980ed7..32af783 100644
--- a/src/embed_source.ts
+++ b/src/embed_source.ts
@@ -20,8 +20,8 @@ export abstract class EmbedSource {
   constructor(url: string) {
     this.url = url;
   }
-  abstract render(src: string): HTMLElement;
-  abstract resolveSrc(): string | Promise<string>;
+  abstract render(): HTMLElement;
+  resolveSrc(): void | Promise<void> {}
   get height(): number | undefined {
     return undefined;
   }
diff --git a/src/source/bluesky.ts b/src/source/bluesky.ts
index e0e084f..cf32cc9 100644
--- a/src/source/bluesky.ts
+++ b/src/source/bluesky.ts
@@ -49,6 +49,7 @@ export class Bluesky extends EmbedSource {
   static #heightCache: Map<string, number> = new Map();
   static id = 0;
   #id = (Bluesky.id++).toString();
+  #src?: string;
   constructor(url: string) {
     super(url);
   }
@@ -61,7 +62,7 @@ export class Bluesky extends EmbedSource {
     };
   }
 
-  render(src: string): HTMLElement {
+  render(): HTMLElement {
     const searchParams = new URLSearchParams({
       id: this.#id,
       colorMode: document.body.classList.contains("theme-dark") ? "dark" : "light",
@@ -69,7 +70,7 @@ export class Bluesky extends EmbedSource {
     const iframe = createEl("iframe", {
       cls: ["external-embed", "node-insert-event"],
       attr: {
-        src: src + "?" + searchParams.toString(),
+        src: this.#src + "?" + searchParams.toString(),
         loading: "lazy",
         "data-bluesky-id": this.#id,
       },
@@ -80,8 +81,13 @@ export class Bluesky extends EmbedSource {
     return iframe;
   }
 
-  override resolveSrc(): string | Promise<string> {
-    return resolveEmbedSrc(this.url);
+  override resolveSrc(): void | Promise<void> {
+    if (this.#src) {
+      return;
+    }
+    return resolveEmbedSrc(this.url).then((src) => {
+      this.#src = src;
+    });
   }
 
   override get height(): number | undefined {
diff --git a/src/widget.ts b/src/widget.ts
index 981f74c..efa2949 100644
--- a/src/widget.ts
+++ b/src/widget.ts
@@ -30,7 +30,6 @@ function Container(url: string, state: WidgetInit["state"]): HTMLElement {
 export class EmbedWidget extends WidgetType {
   #url: string;
   #state: WidgetInit["state"];
-  #src?: string;
   #error?: Error;
   #embedSource: EmbedSource;
   constructor(init: WidgetInit) {
@@ -38,9 +37,6 @@ export class EmbedWidget extends WidgetType {
     this.#url = init.url;
     this.#state = init.state;
     switch (init.state) {
-      case "resolved":
-        this.#src = init.src;
-        break;
       case "failed":
         this.#error = init.error;
         break;
@@ -58,24 +54,23 @@ export class EmbedWidget extends WidgetType {
     switch (this.#state) {
       case "resolving":
         container.appendChild(Loading(this.#embedSource.height));
-        const srcOrPromise = this.#embedSource.resolveSrc();
-        if (srcOrPromise instanceof Promise) {
-          srcOrPromise
-            .then((src) => resolved(view, this.#url, src))
+        const needResolve = this.#embedSource.resolveSrc();
+        if (needResolve instanceof Promise) {
+          needResolve
+            .then(() => resolved(view, this.#url))
             .catch((error) => failed(view, this.#url, error));
         } else {
           this.#state = "resolved";
-          this.#src = srcOrPromise;
           container.setAttribute("data-state", "resolved");
-          container.appendChild(this.#embedSource.render(this.#src!));
+          container.appendChild(this.#embedSource.render());
         }
         break;
       case "resolved":
         container.appendChild(Loading(this.#embedSource.height));
-        container.appendChild(this.#embedSource.render(this.#src!));
+        container.appendChild(this.#embedSource.render());
         break;
       case "loaded":
-        container.appendChild(this.#embedSource.render(this.#src!));
+        container.appendChild(this.#embedSource.render());
         break;
       case "failed":
         container.appendChild(ErrorMessage(this.#error!));
@@ -102,7 +97,7 @@ export class EmbedWidget extends WidgetType {
       case "resolving":
         return false;
       case "resolved":
-        dom.appendChild(this.#embedSource.render(this.#src!));
+        dom.appendChild(this.#embedSource.render());
         return true;
       case "loaded":
         const iframe = dom.querySelector("iframe");
@@ -119,7 +114,6 @@ export class EmbedWidget extends WidgetType {
   }
 }
 
-// TODO: use "loading" state
 export function createElement(url: string, dom: HTMLElement): void {
   const embedSource = EmbedSourceRegistry.lookup(url);
   if (!embedSource) {
@@ -136,12 +130,12 @@ export function createElement(url: string, dom: HTMLElement): void {
     }
     loading.remove();
   });
-  const srcOrPromise = embedSource.resolveSrc();
-  if (srcOrPromise instanceof Promise) {
-    srcOrPromise
-      .then((src) => {
+  const needResolve = embedSource.resolveSrc();
+  if (needResolve instanceof Promise) {
+    needResolve
+      .then(() => {
         container.setAttribute("data-state", "resolved");
-        container.appendChild(embedSource.render(src));
+        container.appendChild(embedSource.render());
       })
       .catch((error) => {
         container.setAttribute("data-state", "failed");
@@ -149,7 +143,7 @@ export function createElement(url: string, dom: HTMLElement): void {
         loading.remove();
       });
   } else {
-    container.appendChild(embedSource.render(srcOrPromise));
+    container.appendChild(embedSource.render());
   }
   dom.replaceWith(container);
 }