A question about Content-Length header

From: ? <cnmjbm@gmail.com> Date: Wed, 21 Jan 2009 18:08:21 +0000 Message-ID: <DF32A461BE6F42B2BDFBD1469F67041B@XP4ANDROID> To: <ietf-http-wg@w3.org> · This archive was generated by hypermail 2.2.0+W3C-0.50 : Monday, 7 December 2009 10:38:35 GMT

Dear Sirs,

As I understand, Content-Length header is not mandatory with HTTP 1.1.

My question is: when a HTTP message has message body (eg. a SOAP envelope)
but does not send Content-Length header,is it a MUST (semantics as by RFC
2119) for the message body to be "chunked" transfer-coded as defined in Sec
3.6.1 of RFC 2616 or be transfer-coded in other scheme?

Thanks & Regards,
Peter