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Okay, I have a class NamedSystems, that has as its only field a Set of NamedSystem. I have a method to find NamedSystems by certain criteria. That's not really important. When it gets results, everything works fine. However, when it can't find anything, and thus returns a null (or empty -- I've tried both ways) set, I get problems. Let me explain. I'm using the Spring RestTemplate class and I'm making a call like this in a unit test: ResponseEntity<?> responseEntity = template.exchange(BASE_SERVICE_URL + "? alias={aliasValue}&aliasAuthority={aliasAssigningAuthority}", HttpMethod.GET, makeHttpEntity("xml"), NamedSystems.class, alias1.getAlias(), alias1.getAuthority()); Now, since this would normally return a 200, but I want to return a 204, I have an interceptor in my service that determines if a ModelAndView is a NamedSystem and if its set is null. If so, I then the set the status code to NO_CONTENT (204). When I run my junit test, I get this error: org.springframework.web.client.RestClientException: Cannot extract response: no Content-Type found Setting the status to NO_CONTENT seems to wipe the content-type field (which does make sense when I think about it). So why is it even looking at it? Spring's HttpMessageConverterExtractor extractData method: public T extractData(ClientHttpResponse response) throws IOException { MediaType contentType = response.getHeaders().getContentType(); if (contentType == null) { throw new RestClientException("Cannot extract response: no Content-Type found"); } for (HttpMessageConverter messageConverter : messageConverters) { if (messageConverter.canRead(responseType, contentType)) { if (logger.isDebugEnabled()) { logger.debug("Reading [" + responseType.getName() + "] as \"" + contentType +"\" using [" + messageConverte

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