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Support range requests for Spring MVC request mapped methods that return a Resource [SPR-15789] #20344

spring-projects-issues opened this issue Jul 18, 2017 · 1 comment
in: web type: enhancement


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spring-projects-issues commented Jul 18, 2017

Andy Wilkinson opened SPR-15789 and commented

I've just been pleased to learn that WebFlux automatically supports range requests to a request mapping method that returns a Resource:

@RequestMapping(path = "/")
public Resource test() {
	return new ByteArrayResource(new byte[] {'a', 'b', 'c', 'd', 'e', 'f'});
$ curl localhost:8080 -H "Range: bytes=2-4" -i
HTTP/1.1 206 Partial Content
Accept-Ranges: bytes
Content-Type: application/octet-stream
Content-Range: bytes 2-4/6
Content-Length: 3


Unfortunately, if the same controller is implemented using Spring MVC, the full resource content is returned:

$ curl localhost:8080 -H "Range: bytes=2-4" -i
HTTP/1.1 200
Content-Type: application/json
Content-Length: 6
Date: Tue, 18 Jul 2017 13:03:31 GMT


It would be beneficial to Boot 2.0's new actuator endpoint infrastructure if Spring MVC offered the same capabilities as WebFlux here.

Affects: 5.0 RC2

Issue Links:

Referenced from: commits 582014e

1 votes, 3 watchers

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peter-kehl commented Mar 13, 2020

Side notes: Are you figuring out how to implement partial downloads (HTTP range)?

In addition to returning Resource, your controller method needs to be annotated with @ResponseBody, too. Otherwise it upsets Spring and it chains the request as if the URL was repeated.

If you do return a Resource, Spring ignores any content type you set by servletResponse.setContentType(String). It probably auto-detects the content type instead.

Alternatively, don't use @ResponseBody and return type org.springframework.http<Resource> and generate it like (in Kotlin):

return ResponseEntity

If you use InputStreamResource, extend it (for example as an anonymous class) and override its contentLength(), too.

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