TIdEntityHeaderInfo.Connection
TIdEntityHeaderInfo.ContentVersion
TIdEntityHeaderInfo.ContentEncoding
TIdEntityHeaderInfo.ContentLanguage
TIdEntityHeaderInfo.ContentType
TIdEntityHeaderInfo.ContentLength
TIdEntityHeaderInfo.ContentRangeStart
TIdEntityHeaderInfo.ContentRangeEnd
TIdEntityHeaderInfo.Date
TIdEntityHeaderInfo.LastModified
TIdEntityHeaderInfo.Expires
TIdEntityHeaderInfo.CustomHeaders
TIdEntityHeaderInfo.RawHeaders

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