Printing remote pdf in Sencha ExtJs from Spring-Boot app doesn´t work - spring

Question

I have an ExtJS app that shows a PDF from a spring boot app using a REST service. So far this works fine but when I have updated the spring-boot version from 1.3 -> 1.4, the code doesn´t work fine and shows me a blank PDF as response.
This is my code:
ExtJS - Sencha
Ext.Ajax.request({
url: MyApp.Application.Globals.baseUrl + url,
params: params,
method: 'POST',
async: false,
headers:{
'Authorization': Utils.getAuthorization()
},
scope : this,
// ON SUCCESS
success: function(response) {
window.open('data:application/pdf,' + escape(response.responseText));
},
// ON FAILURE
failure: function(err) {
console.log(err);
}
});
Server Code (Spring-Boot)
String report = reportService.executeReport(....);
response.setContentType("application/pdf");
try {
response.getWriter().write(report);
} catch (IOException e) {
ELogger.error(this, CoreConstants.LOGGER_CATEGORY, "error creating pdf", e);
}
POM
<spring-boot.version>1.4.4.RELEASE</spring-boot.version> with 1.3.3 it works fine
If anyone can help me, I will be grateful.
Regards!

Answer 1

I have found the workaround using ResponseEntity as a response:
#RequestMapping(value = "/example", produces = "application/pdf")
public ResponseEntity<InputStreamResource> exampleMethod(){
HttpHeaders headers = new HttpHeaders();
headers.setContentType(MediaType.parseMediaType("application/pdf"));
headers.add("Access-Control-Allow-Origin", "*");
headers.add("Access-Control-Allow-Methods", "GET, POST, PUT");
headers.add("Access-Control-Allow-Headers", "Content-Type");
headers.add("Content-Disposition", "filename=sysparamspdf");
headers.add("Cache-Control", "no-cache, no-store, must-revalidate");
headers.add("Pragma", "no-cache");
headers.add("Expires", "0");
headers.setContentLength(report.getBytes(StandardCharsets.UTF_8).length);
ResponseEntity<InputStreamResource> response = new ResponseEntity<InputStreamResource>(
new InputStreamResource(stream), headers, HttpStatus.OK);
return response;
}