How to remove charset=utf-8 in a Content-Type header, generated by spring-boot

Question

I'm trying to send an mp4 file as a response body in spring-boot. I've tried setting the Content-Type header to video/mp4 using the following methods:

1. A RequestMapping annotation parameter:

   @RequestMapping(value = "/movie.mp4", method = RequestMethod.GET, produces = "video/mp4")
   

2. Manually setting a header value via HttpHeaders, passed to return ResponseEntity.

Each time the resulting header is as follows:

Content-Type:video/mp4; charset=UTF-8

How do I get rid of the charset=UTF-8 postfix?

Answer 1

It took some debugging, but I found that HttpEncodingAutoConfiguration sets spring.http.encoding.force=true. If you set this to false in your application.properties, the charset will be omitted.