Establish a timeout for a JSON response in an HTTP POST request

When sending HTTP requests to an API, I encountered the issue of slow response times and needed to adjust the timeout value. The API returns a JSON array of Dimension objects. Here is the initial POST request that was functioning correctly:

autodetect(configuration: IntegConfig): Observable<Dimension[]> {
      return this.http.post<any>(this.setupAPIUrl + `autodetect`, configuration);
}

To address the slow response time, I attempted to add a timeout to the request. However, my efforts led to a compile time error:

Type 'ArrayBuffer' is missing the following properties from type 'Dimension[]': length, pop, push, concat, and 25 more.

It became clear that the http.post method had multiple overloads with different return types, making it challenging to simply set a timeout while maintaining the same return type. Some suggestions in similar questions did not resolve the issue, including setting the options parameter as type any or adjusting the post<T> return type declaration.

Trying different parameter configurations also did not yield the desired result:

const options = {
  headers: new HttpHeaders(),
  observe: 'events' as const,
  params: new HttpParams(),
  reportProgress: false,
  responseType: 'json' as const,
  withCredentials: false,
  timeout: 200000
};

The question remains: how can a simple HTTP timeout be set on a POST request?

Answer №1

If you're facing a TypeScript error, it's best to steer clear of using the any type.

One way to restructure your method is by doing the following:

autodetect(configuration: IntegConfig): Observable<Dimension[]> {
  return this.http.post<Dimension[]>(this.setupAPIUrl + 'autodetect', configuration);
}

Now, if you prefer utilizing template literals, you can use:

`${this.setupAPIUrl}autodetect`

In response to @jonrsharpe's suggestion, implementing a timeout RxJS operator can be beneficial for enforcing a shorter timeout than the browser's default setting.

Here's how you could incorporate it:

autodetect(configuration: IntegConfig): Observable<Dimension[]> {
  return this.http.post<Dimension[]>(this.setupAPIUrl + 'autodetect', configuration)
    .pipe(timeout(1000));
}

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