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我的要求很简单。我需要等待特定的 rest api() 调用以提供成功状态代码一旦特定的 rest api 成功，我需要执行一些其他操作。我的restapi只会在一段时间后给出积极的状态（本质上是动态的）

this.httpClient.get('someurl').pipe(
  retryWhen(err =>
    err.pipe(
      concatMap(err => {

        // here we can check the error.
        // We can specify the retry only if it is throwing  404 error.
        // 404 ---- job is still runnig 
        console.log(err.status)
        if (err.status === 404) {
          console.log('Job is not yet completed ')
          return of(err);
        }
        // in other cases we throw an error down the pipe
        console.log('Returning another error ')
        return throwError(err);
      }),
      delay(1000),
      // we can keep calling forever but usually we want to avoid this.
      // So, we set the number of attempts including the initial one.
      //o => concat(o, throwError(`Sorry, there was no result after 3 retries)`))
    )
  ))

上面的代码一直在执行，直到它给出 200 响应，但是那个特定的响应不知何故我无法掌握它

一旦其余 api 成功，我需要一些可以放置的逻辑

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