I solved the issue in this way (please note that I have merged multiple solutions found on stack overflow, but I cannot find the references. Feel free to add them in the comments).
In My service I have:
public getPDF(): Observable<Blob> {
//const options = { responseType: 'blob' }; there is no use of this
let uri = '/my/uri';
// this.http refers to HttpClient. Note here that you cannot use the generic get<Blob> as it does not compile: instead you "choose" the appropriate API in this way.
return this.http.get(uri, { responseType: 'blob' });
}
In the component, I have (this is the part merged from multiple answers):
public showPDF(fileName: string): void {
this.myService.getPDF()
.subscribe(x => {
// It is necessary to create a new blob object with mime-type explicitly set
// otherwise only Chrome works like it should
var newBlob = new Blob([x], { type: "application/pdf" });
// IE doesn't allow using a blob object directly as link href
// instead it is necessary to use msSaveOrOpenBlob
if (window.navigator && window.navigator.msSaveOrOpenBlob) {
window.navigator.msSaveOrOpenBlob(newBlob, fileName);
return;
}
// For other browsers:
// Create a link pointing to the ObjectURL containing the blob.
const data = window.URL.createObjectURL(newBlob);
var link = document.createElement('a');
link.href = data;
link.download = fileName;
// this is necessary as link.click() does not work on the latest firefox
link.dispatchEvent(new MouseEvent('click', { bubbles: true, cancelable: true, view: window }));
setTimeout(function () {
// For Firefox it is necessary to delay revoking the ObjectURL
window.URL.revokeObjectURL(data);
link.remove();
}, 100);
});
}
The code above works in IE, Edge, Chrome and Firefox. However, I don't really like it, as my component is pulluted with browser specific stuff which will surely change over time.
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