Payload (Empty Content-Type) Forbidden Error | While downloading a pdf file from the server in ember

Objective: Want to download a PDF file from the server by generating the below URL: http://localhost:4200/bookStore/secured/rest/books/14119

The URL gets generated when the below line gets executed in the book.js in routes.

return this.store.findRecord('book', bookId);

But I get 403 forbidden error. The error in details:

Error: Ember Data Request GET /bookStore/secured/rest/books/14119 returned a 403
Payload (Empty Content-Type)
Forbidden
    at new AdapterError (-private.js:3170)
    at Class.handleResponse (rest.js:594)
    at ajaxError (rest.js:956)
    at Class.hash.error (rest.js:623)
    at fire (jquery.js:3317)
    at Object.fireWith [as rejectWith] (jquery.js:3447)
    at done (jquery.js:9274)
    at XMLHttpRequest.<anonymous> (jquery.js:9514)

Do I need to set the content-type as 'application/pdf'? and if yes, then please suggest how to set it.

Below is the JS code:

routes\book.js

actions: {
    pdfClick(bookId) {
      return this.store.findRecord('book', bookId);
   }
}

template\book.hbs

<button >PDF</button>

In the server side, the code which receive and respond the request is as follows:

@GET
@Path("/{bookId}")
@Produces("application/pdf")
public Response bookExport(@PathParam("bookId") long bookId) {
   //Code
}

According to the server side code, we are getting PDF file from the server. This is tested successfully using PostMan.