Spring controller: Content-Type for StreamingResponseBody

Question

In search for the least amount of code to serve a BufferedImage (painted in a service-class) from a spring-mvc Controller, I came up with the following:

@GetMapping(value = "/image", produces = "image/png") public StreamingResponseBody image() { BufferedImage canvas = service.createImage(); return outputStream -> ImageIO.write(canvas, "png", outputStream); }

So far, so good - using the image in HTML via <img src="/image"> works fine.

However, spring does not send any Content-Type header at all. Together with serving X-Content-Type-Options: nosniff in the response, this leads to garbage in the browser window when the image URL is opened directly.

How do I provide a content-type header in the most spring-friendly way (i.e. not using HttpServletResponse directly)?

you don't......

MarianP
– MarianP

2017-11-16 22:13:07 +00:00
Commented Nov 16, 2017 at 22:13 — MarianP
– MarianP, Commented Nov 16, 2017 at 22:13

ESala · Accepted Answer · 2018-11-20 15:17:53Z

You can wrap it in a ResponseEntity<...>, this allows you to easily modify all the parameters in the response through the response builder:

@GetMapping(value = "/image", produces = "image/png") public ResponseEntity<StreamingResponseBody> image() { BufferedImage canvas = service.createImage(); StreamingResponseBody stream = outputStream -> ImageIO.write(canvas, "png", outputStream); return ResponseEntity.ok() .contentType(MediaType.IMAGE_PNG) .body(stream); }

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