HTTP headers returned as part of ResponseEntity(MultiValueMap<String, String> headers, HttpStatus statusCode) are ignored when using this constructor [SPR-7381]

[spring-projects-issues]

Florian Rampp opened SPR-7381 and commented

If a controller method returns a ResponseEntity, and this entity is created with the constructor ResponseEntity(MultiValueMap<String, String> headers, HttpStatus statusCode) the passed headers are ignored and do not appear in the resulting HTTP response.

I suppose that the reason for this is an error in the class AnnotationMethodHandlerAdapter, line 916:
if (body != null) {
writeWithMessageConverters(body, inputMessage, outputMessage);
}

If the body of the response entity is null, the message is not written.

If I use the constructor ResponseEntity(T body, MultiValueMap<String, String> headers, HttpStatus statusCode), the headers appear as expected.

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Affects: 3.0.3

Referenced from: commits c24ffc9