RFC3261: SIP:20.15 Content-Type

20.15 Content-Type

   The Content-Type header field indicates the media type of the message-body sent to the recipient.  The "media-type" element is defined in [H3.7].  The Content-Type header field MUST be present if the body is not empty.  If the body is empty, and a Content-Type header field is present, it indicates that the body of the specific type has zero length (for example, an empty audio file).

“Content-Type”报头字段指示发送给收件人的消息体的媒体类型。【H3.7】中定义了“media-type”元素。如果正文不为空，则必须存在“Content-Type”报头字段。如果消息体为空，并且存在“Content-Type”报头字段，则表示特定类型的消息体长度为零（例如，空音频文件）。

   The compact form of the header field is c.

报头字段的紧凑形式是c。

   Examples:

示例：

      Content-Type: application/sdp
      c: text/html; charset=ISO-8859-4