Troubleshooting error messages with Angular 2 HttpClient response payload

Question

Troubleshooting error messages with Angular 2 HttpClient response payload

Currently, I am implementing the latest version (4.3) of HttpClient in angular to handle data POST requests to my backend server:

this.httpClient.post<View>(`/path`, data).subscribe(
  (view: View) => console.log("Success"),
  (error: HttpErrorResponse) => {
      console.log(error)
      this.errorMessage = <any>error.error;
  });
);

Although this call should generate an expected error with a status code of 409, oddly enough, the logged error message does not contain the response body from the server. While the status code is visible, the error.error field, which usually contains the response body, seems to be missing. Does anyone have any insights on what could potentially be causing this issue?

Through testing, I have verified that using curl for the backend call allows me to retrieve the response body from the server.

ajax angular rest

Answer 1

Answer №1

Is the response you receive for your error in JSON format or is it unformatted text or something else? In my case, I faced a similar issue until I realized that the body returned with the error result was just a simple string. To resolve this, I had to modify the call and make it similar to the following (please excuse the lack of type safety here):

this.http.post('http://address', body, { responseType: 'text' })
        .subscribe(data => {
            this.result = data['value'];
            this.router.navigate(['/route']);
        }, (error: HttpErrorResponse) => {
            this.error = error.error;
            this.router.navigate(['/error']);
        });

Answer 2

Is the response you receive for your error in JSON format or is it unformatted text or something else? In my case, I faced a similar issue until I realized that the body returned with the error result was just a simple string. To resolve this, I had to modify the call and make it similar to the following (please excuse the lack of type safety here):

this.http.post('http://address', body, { responseType: 'text' })
        .subscribe(data => {
            this.result = data['value'];
            this.router.navigate(['/route']);
        }, (error: HttpErrorResponse) => {
            this.error = error.error;
            this.router.navigate(['/error']);
        });

Answer 3

Answer №2

Angular has a well-documented issue where it encounters a bug during the parsing of JSON, resulting in the error field not being populated:

If you're interested in more technical details, you can check out this link: https://github.com/angular/angular/pull/18466

Answer 4

Angular has a well-documented issue where it encounters a bug during the parsing of JSON, resulting in the error field not being populated:

If you're interested in more technical details, you can check out this link: https://github.com/angular/angular/pull/18466

Troubleshooting error messages with Angular 2 HttpClient response payload

Answer №1

Answer №2

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