`java.net.HttpClient` has been updated to stop sending the `Content-Length` header on HTTP/1.1 requests using a [method][HttpRequest.Builder.method] other than `POST` or `PUT` when provided with a `BodyPublisher` that reports a `contentLength()` of zero bytes.

This behavior follows the recommendations in RFC 9110: HTTP Semantics.

Users who need the header may add it using the HttpRequest Builder. The header is restricted by default, and needs to be allowed by setting the system property [jdk.httpclient.allowRestrictedHeaders] to include `content-length`.