Identify the most suitable HTTP method within a reusable function for making API requests with Angular's HTTPClient module

I am working on implementing a reusable service to handle requests to my API. Currently, it is functioning as expected, but only for GET requests.

This is the current function in use:

  makeAPIRequest = ({ ...opts }) => {
    return this.http.get(opts.url, opts.params)
      .toPromise()
      .then(response => response)
      .catch(err => this.handleError(err));
  };

Below is an example of how this function is utilized:

  getCustomer(id): Promise<Customer> {
    return this.APIService.makeAPIRequest({
      url: this.customerEditUrl(id)
    }) as Promise<Customer>;
  }

I am looking to enhance the functionality by allowing the passing of an HTTP method into the opts. However, I am uncertain about the most efficient way to achieve this without using extensive conditionals or repetition. Ideally, I would like to approach this in a concise manner. For instance, if I provide opts with this structure:

 { url: this.customerEditUrl(id), params, httpMethod: 'POST' }

How can I modify my makeAPIRequest function to accommodate this change?

  makeAPIRequest = ({ ...opts }) => {
    return this.http.post(opts.url, opts.params)
      .toPromise()
      .then(response => response)
      .catch(err => this.handleError(err));
  };

Appreciate any insights!

Answer №1

Instead of utilizing this.http.post(), you have the option to manually generate a new request. The request constructor enables you to specify the method as a string.

Check out: https://angular.io/api/common/http/HttpClient#request

One of the variations for the constructor of this.http.request(...) appears like this:

request(method: string, url: string, options: { body?: any; headers?: HttpHeaders | { [header: string]: string | string[]; }; observe?: "body"; params?: HttpParams | { [param: string]: string | string[]; }; reportProgress?: boolean; responseType: "blob"; withCredentials?: boolean; }): Observable<Blob>

Notice that the initial parameter is the HTTP Method in string format. The remaining elements should be quite familiar to you.

this.http.request(opts.httpMethod, opts.url, opts.params)

should get the job done ;)


I would also recommend exploring directly working with observables instead of converting the observable returned into a promise.

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