基于第一次 POST 调用的响应的角度 http POST 调用重试

Question

I have a scenario where I need to retry the post call based on the response flag from the first attempt of the same post call.

I have following service call

this.CommonService.postRequest(this.RequestData)
.subscribe((data:Response) => 
{ if(data){ 
//based on the flag in the response data I need to make same call again until the flag is false. 
} });

I will get a flag in the response when I make the above call. If I get a flag true then I need to retry same call. I can retry the same call for maximum 3 times.

any idea how to handle it?

Answer 1

use the switchMap operator to wait for the response of the first request to arrive before firing the second request.

return this.http.get('url/1')
  .switchMap(res1 => {
    // use res1 response
    this.http.get('url/2')
  })
  .subscribe(res2 => {

  })

Answer 2

Use rxjs retry or retryWhen:

https://www.learnrxjs.io/operators/error_handling/retry.html

https://www.learnrxjs.io/operators/error_handling/retrywhen.html