| http://www.w3.org/ns/prov#value | - an be determined prior to being transferred, a Content-Length header field SHOULD be sent to indicate the length of the payload body that is either present as the message body, for requests and non-HEAD responses other than 304, or would have been present had the request been an unconditional GET. The length is expressed as a decimal number of octets.?? Content-Length = 1*DIGIT
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