refactor: report HTTP fetch errors as such

Author: danielpeintner

packages/binding-http/src/http-client-impl.ts

@@ -433,6 +433,9 @@ export default class HttpClient implements ProtocolClient {
         if (HttpClient.isOAuthTokenExpired(result, this.credential)) {
             this.credential = await (this.credential as OAuthCredential).refreshToken();
             return await this._fetch(await this.credential.sign(request));
+        } else if (result.status >= 400) {
+            // report generic error
+            throw new Error(`request to ${request.url} failed, reason: HTTP status result ${result.status} `);
         }
 
         return result;