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There are cases that there is no Expires header, but a ETag header and a Last-Modified header.In that case validation of a resource is done based on the last-modified date and the ETag.You see that the vti_etag property is composed of a GUID and an integer number.The integer number comes from the vti_docstoreversion property which indicates how much times the file has been changed.The most popular ways are: When a file is uploaded in a document library, it is stored in the content database.

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If the If-None-Match header matches the ETag and the If-Modified-Since is still the same date as the Last-Modified header then the web server responds with a 304 Not Modified response.If for example a component is different based on the User-Agent or Accept-Language headers, the state of the entity can be reflected in the ETag.

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