fix(core): update

ts/index.ts

@@ -49,7 +49,7 @@ export class WebRequest {
     const response: Response = await this.request(urlArg, {
       body: plugins.smartjson.stringify(requestBody),
       method: 'POST',
-      useCache: useCacheArg
+      useCache: useCacheArg,
     });
     const responseText = await response.text();
     const responseResult = plugins.smartjson.parse(responseText);
@@ -103,12 +103,12 @@ export class WebRequest {
     let cachedResponseDeferred = plugins.smartpromise.defer<Response>();
     let cacheUsed = false;
     if (optionsArg.useCache && this.cacheStore.check(urlArg)) {
-      const responseBuffer: ArrayBuffer = await this.cacheStore.get(urlArg)
+      const responseBuffer: ArrayBuffer = await this.cacheStore.get(urlArg);
       cachedResponseDeferred.resolve(new Response(responseBuffer, {}));
     } else {
       cachedResponseDeferred.resolve(null);
     }
-    const response: Response = await fetch(urlArg, {
+    let response: Response = await fetch(urlArg, {
       signal: controller.signal,
       method: optionsArg.method,
       headers: {
@@ -116,8 +116,8 @@ export class WebRequest {
         ...(optionsArg.headers || {}),
       },
       body: optionsArg.body,
-    }).catch(async err => {
-      if (optionsArg.useCache && await cachedResponseDeferred.promise) {
+    }).catch(async (err) => {
+      if (optionsArg.useCache && (await cachedResponseDeferred.promise)) {
         cacheUsed = true;
         const cachedResponse = cachedResponseDeferred.promise;
         return cachedResponse;
@@ -125,6 +125,10 @@ export class WebRequest {
         return err;
       }
     });
+    if (optionsArg.useCache && (await cachedResponseDeferred.promise) && response.status === 500) {
+      cacheUsed = true;
+      response = await cachedResponseDeferred.promise;
+    }
     if (!cacheUsed && optionsArg.useCache && response.status < 300) {
       const buffer = await response.clone().arrayBuffer();
       await this.cacheStore.set(urlArg, buffer);