Encountering an issue while trying to load a file from an API due to difficulties in parsing it to

When trying to load an xlsx file from an API, I encountered an error because Angular automatically tries to parse the body as JSON.

To resolve this issue, I found that specifying the response type directly in the request works:

this.http.get(this.url + "/getExcel", {responseType:'blob'});

However, when I also need to include authorization in the headers, it doesn't work as expected:


const headers = new HttpHeaders({
    responseType:'blob',
    'Content-Type': 'application/json',
    'Authorization': this.authService.getToken()
})
this.http.get(this.url + "/getExcel",{headers});

I'm puzzled as both approaches should achieve the same outcome. What could be causing the difference?

Answer №1

Don't mix up the elements incorrectly. The correct approach is:

const options = new HttpHeaders({ 
    'Content-Type': 'application/json',
    'Authorization': this.authService.getToken()
})
this.http.get(this.url + "/downloadFile",{
    headers: options,
    responseType: 'blob'
});

Answer №2

It is recommended to use application/octet-stream as the Content-Type, or simply omit the Content-Type header altogether.

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