Spring REST Template for Byte
Just not send the accept header to not force the server to return that content-type. This is the same as sending a wildcard */*
//HttpHeaders headers = new HttpHeaders();//headers.setAccept(Collections.singletonList(MediaType.WILDCARD));ResponseEntity<byte[]> result = restTemp.exchange(url, HttpMethod.GET, entity, byte[].class,documentId);After this, extract the content-type from the headers of the response
byte body[] = result.getBody(); MediaType contentType = result.getHeaders().getContentType();
You can store a media type in the HTTP headers and use - ResponseEntity.getHeaders(), for instance. or you can wrap byte array and media type into holder class.