Note that there is no {@code Content-Length} header if the HTTP request content is {@code null} .However, when making a request like PUT or POST without a {@code Content-Length} header, someservers may respond with a {@code 411 Length Required} error. Specifying the{@code Content-Length: 0} header may work around that problem.
@since 1.11 @author Yaniv Inbar
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