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  1. #1
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    Apr 2015
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    New Delhi
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    What is an ETag and how does it work?

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  2. #2
    Senior Member
    Join Date
    Jan 2015
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    India
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    729
    The ETag or entity tag is part of HTTP. It is one of several mechanisms that HTTP provides for web cache validation and which allows a client to make conditional requests. This allows caches to be more efficient, and saves bandwidth, as a web server does not need to send a full response if the content has not changed. ETags can also be used for optimistic concurrency control, as a way to help prevent simultaneous updates of a resource from overwriting each other.

    An ETag is an opaque identifier assigned by a web server to a specific version of a resource found at a URL. If the resource content at that URL ever changes, a new and different ETag is assigned.

  3. #3
    Registered User
    Join Date
    Jan 2016
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    613
    The ETag or entity tag is part of HTTP, the protocol for the World Wide Web. It is one of several mechanisms that HTTP provides for web cache validation, which allows a client to make conditional requests. This allows caches to be more efficient, and saves bandwidth, as a web server does not need to send a full response if the content has not changed. ETags can also be used for optimistic concurrency control,as a way to help prevent simultaneous updates of a resource from overwriting each other.

    An ETag is an opaque identifier assigned by a web server to a specific version of a resource found at a URL. If the resource representation at that URL ever changes, a new and different ETag is assigned. Used in this manner ETags are similar to fingerprints, and they can be quickly compared to determine whether two representations of a resource are the same.

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