ResponseEntity.ok()
        .headers(result.getHttpHeaders())
        .body(new InputStreamResource(result.getInputStream()));

$http.get("path/pdf",
    { params:params },
    { responseType:"arraybuffer" }
)
.then(function(response){
     console.log(response.data);
     var blob = new Blob([response.data], {type: 'application/pdf'});
     FileSaver.saveAs(blob, 'arquivo.pdf');
});