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How to retry a request inside my viewmodel


By : dhilip
Date : September 16 2020, 10:00 PM
like below fixes the issue The LiveData from the second call to viewModel.getPrizes has no Observers attached to it, and hence it will not get a value until there is one.
You would have to call viewModel.getPrizes.observe(...) again inside the current Observer which is not optimal.
code :


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Will haproxy ever retry a request where the upstream request has timed out waiting for a response?


By : user3666399
Date : March 29 2020, 07:55 AM
wish help you to fix your issue HAProxy will only re-send a request if a backend has not accepted the request.

How to retry a request based on response headers using request and nodejs?


By : divdong
Date : March 29 2020, 07:55 AM
I hope this helps you . I ended up ditching the requestretry library and went with request and implemented the retry mechanism myself.
One issue was to get the actual response body data. I expected it to be available through the response event, yet this only has the header.
code :
export class FileFetcher {
    public async downloadWithRetry(url: string, maxRetries: number, timeout: number): Promise<Buffer> {
        while (true) {
            try {
                const buffer = await this.fetchFile(url);
                return new Promise<Buffer>(resolve => {
                    resolve(buffer);
                });
            } catch (e) {
                maxRetries = maxRetries - 1;

                if (maxRetries <= 0) {
                    throw new Error("Too many requests");
                }

                console.warn(`No file at url:${url}, waiting ...`);
                await this.wait(timeout);
                console.log(`Continue.`);
            }
        }
    }

    private async wait(timeout: number): Promise<any> {
        timeout *= 1e3;
        console.log(timeout);
        return new Promise(resolve => {
            setTimeout(resolve, timeout);
        });
    }

    private async fetchFile(url: string): Promise <Buffer> {
        return new Promise<Buffer>((resolve, reject) => {
            let data = [];
            request.get({
                encoding: null,
                url: url,
            }).on("data", function (chunk) {
                data.push(chunk);
            }).on("response", function (response) {
                /**
                 * Server always returns 200 OK even if file does not exist yet. Hence checking for content-lenth head
                 */
                if (!(response.headers["content-length"] > 0)) {
                    reject("Empty response!");
                }
            }).on("end", function () {
                const body = Buffer.concat(data);
                if (body.length > 0) {
                    resolve(body);
                    return;
                }

                reject("Empty response");
            });
        });
    }
}

Angular HttpClient request with retry and delay is sending an extra request then canceling it


By : Shruti Wadhokar
Date : March 29 2020, 07:55 AM
I think the issue was by ths following , Here is how I solved it. now three tries with a second delay per request and no extra canceled request
code :
 return this.http.post<LoginSuccessPayload>('/api/auth/signin', payload).pipe(
  retryWhen(errors => errors.pipe(
    switchMap((error) => {
      if (error.status === 504 || error.status === 503) {
        return of(error.status);
      }
      return _throw({message: error.error.message || 'Notification.Core.loginError'});
    }),
    scan(acc => acc + 1, 0),
    takeWhile(acc => acc < 3),
    delay(1000),
    concat(_throw({message: 'Notification.Core.networkError'}))
  ))
);

Resilience4j Retry: Should you create singleton of Retry or create new one for every request?


By : user3425030
Date : March 29 2020, 07:55 AM
like below fixes the issue A single instance is sufficient. It won't affect concurrent requests. You can use the name of the service (backend system) which you want to protect as the ID, for example.

How to modify the request params and headers when i want to retry the request with retrofit and rxandroid


By : Siddharth Jaiswal
Date : March 29 2020, 07:55 AM
To fix this issue What you need is an Interceptor (I assume, you are using OkHttp with Retrofit).
code :
@Override
public Response intercept(Chain chain) throws IOException {
    okhttp3.Request original = chain.request();    
    Response origResponse = chain.proceed(request);
    if (origResponse.code() == RETRY_CODE) {
        // modify your original request (add headers to it etc.)
        ...
        return chain.proceed(original);
    }
}
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