Describing the Content
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Several properties describe the content of the response. ContentType gives the media type of the response, and ContentVersion is the version number for that media type. ContentLength gives the length of the response. If the content is encoded (such as for data compression), indicate this with the ContentEncoding property. If the content came from another URI, this should be indicated in the DerivedFrom property. If the value of the content is time-sensitive, the LastModified property and the Expires property indicate whether the value is still valid. The Title property can provide descriptive information about the content.