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[REBOL] Re: Reading HTTP headers

From: jason:cunliffe:verizon at: 12-Jan-2002 23:44

> hmmm anyone know what an "Etag:" is? <quote> ETag is used for checking if the resource is modified. When you modify a resource, server generates new ETag for it. ETag may be e.g. simple hash, or time when the resource was changed, or any other implementation-specific value. RFC 2616 (HTTP/1.1) says: The ETag response-header field value, an entity tag, provides for an "opaque" cache validator. This might allow more reliable validation in situations where it is inconvenient to store modification dates, where the one-second resolution of HTTP date values is not sufficient, or where the origin server wishes to avoid certain paradoxes that might arise from the use of modification dates. </quote>