Angular HTTP response displays 200 status code, yet fails to contact the server

We are utilizing Angular 6 along with NGXS for State Management in our web application.

One specific server call is causing issues, while all other similar calls work fine. Interestingly, this particular call functions without any problems on our dev environments.

It is worth noting that both our server environment and local dev environment share the same database.

https://i.sstatic.net/VpY2h.png (I am unable to post images due to reputation constraints)

The response indicates that the URL is empty and none of the test params are included in the response.

Upon server logging, it appears that the call never reaches the controller and no exceptions are thrown. Using Fiddler, there is no indication of communication with the API.

protected getEntities(viewContext: ViewContext, entityQuery: TEntityQuery, pagingContext: PagingContext): Observable<QueryResult<TEntity[]>> {

    const params = this.requestUtilsService.getHttpParams(entityQuery, viewContext, pagingContext);

    this.logger.log('sending entity query with params', params);

    const entitiesUrl = this.getEntitiesUrl();

    return this.http.get<TEntity[]>(entitiesUrl, { params: params, observe: 'response' }).pipe(
      map(resp => this.responseUtilsService.getQueryResult(resp))
    );
  }

I anticipate receiving a list of entities or a server error. I expect the TypeScript code to successfully communicate with the API.

Answer №1

Is it necessary to add a subscription to the http.get() method? Rxjs Observables are lazy, meaning they will only execute values once something subscribes to them. The request is not executed until there is a subscription.

According to https://angular.io/guide/http: "The HttpClient method does not send its HTTP request until you call subscribe() on the observable returned by that method"

Answer №2

After successfully troubleshooting, I have discovered the root of the issue and would like to share my solution:

We were facing a challenge with a backend Controller named AssetsController, where requests to this specific name were not being sent properly even though they were yielding a HTTP 200 response. By renaming the controller, we were able to resolve the issue and restore functionality.

While the exact cause of the problem remains unknown, we are grateful for overcoming this obstacle.

I extend my gratitude to all those who offered their assistance throughout this process!

Warm regards,

Daniel

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