Angular 8 HttpClient: Unable to process text/csv server response

Question

I have a endpoint which returns a csv data set which will be saved using saveas and Blob AngularJS frontend works fine while Angular 8 struggles. Here is my Angular 8 implementation

 const headers = new HttpHeaders({
            Accept: 'text/csv',
        });
        const options = { headers };
        this.httpClient
            .post<ExportCsvSettingsViewDto>(this.appConfigService.buildApiUrl(this.loadPath(batchId)), csvDto, options)
            .subscribe((fileResult: any) => {
                const file = new Blob([fileResult], { type: 'text/csv' });
                saveAs(file, this.fileName + '.csv');
            });

This results in a HttpErrorResponse stating: Object {error: SyntaxError: Unexpected token . in JSON at positio…, text: "1.112.373;en-US Date Time UTC;Date Local Time;Bat…"}

I suspect this is because HttpClient treats the response as JSON instead of "text/csv" Those were the request headers:

Connection: keep-alive
Content-Length: 141
Pragma: no-cache
Cache-Control: no-cache
Accept: text/csv
Content-Type: application/json
Accept-Encoding: gzip, deflate
Accept-Language: en-US,en;q=0.9

and response headers:

HTTP/1.1 200 OK
Cache-Control: no-cache, no-store, must-revalidate
Pragma: no-cache
Content-Type: text/csv
Expires: 0
Server: Microsoft-IIS/10.0
X-Powered-By: ASP.NET
X-UA-Compatible: IE=edge
Content-Length: 191147

I tried to explicitly set "responseType" in request header to "text/csv" but that's just not possible. Any ideas on that?

yBother · Accepted Answer · 2020-02-27 11:30:07Z

7

In case anybody cares: My suspicion was right: the response was considered to be of type json. Setting responseType='text' worked by doing like this:

  const options = { headers, responseType: 'text' as any };

I consider this to be a big issue actually

answered Feb 27, 2020 at 11:30

yBother

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