draft-ietf-httpbis-p5-range-21, "3.2 416 Requested Range Not Satisfiable"

<http://greenbytes.de/tech/webdav/draft-ietf-httpbis-p5-range-21.html#status.416>:

"When this status code is returned for a byte-range request, the 
response SHOULD include a Content-Range header field specifying the 
current length of the representation (see Section 5.2). This response 
MUST NOT use the multipart/byteranges content-type. For example,"

What is this "MUST NOT" about? Are there clients that will ignore the 
status code and assume success if they see the expected content-type?

Best regards, Julian

Received on Wednesday, 24 October 2012 12:21:35 UTC