Content-length set to -1 when it is not sent from the server

[kjezek]

When a request is triggered to a server endpoint, which does not provide Content-length, the ApacheConnector adds Content-length with the value equals to -1.

The problematic code is here:

jersey/connectors/apache-connector/src/main/java/org/glassfish/jersey/apache/connector/ApacheConnector.java

Lines 512 to 514 in e84b5e8

	if (headers.get(HttpHeaders.CONTENT_LENGTH) == null) {
	headers.add(HttpHeaders.CONTENT_LENGTH, String.valueOf(entity.getContentLength()));
	}

It should probably be:

                if (headers.get(HttpHeaders.CONTENT_LENGTH) == null && entity.getContentLength() > 0) {
                    headers.add(HttpHeaders.CONTENT_LENGTH, String.valueOf(entity.getContentLength()));
                }

The main problem is that the ApacheConnector generates the header value, which is against the specification, i.e. when the content length is not know, this header should not be provided at all, not provided with a negative value.