A pre-condition: apply this operation only if the HTTP Entity Tag does not match.
HTTP Entity Tags allow applications to conditionally execute a query only if the target resource matches the expected state. This can be useful, for example, to implement optimistic concurrency control in the application.
[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Hard to understand","hardToUnderstand","thumb-down"],["Incorrect information or sample code","incorrectInformationOrSampleCode","thumb-down"],["Missing the information/samples I need","missingTheInformationSamplesINeed","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-05-07 UTC."],[[["The webpage provides a version history for the `IfNoneMatchEtag` structure in the Google Cloud Storage C++ library, ranging from version 2.11.0 to the latest release candidate 2.37.0-rc."],["`IfNoneMatchEtag` is used to conditionally execute a query based on whether the HTTP Entity Tag of a resource matches an expected value, useful for applications implementing optimistic concurrency control."],["Each listed version links to the corresponding documentation for the `IfNoneMatchEtag` structure, enabling users to view the specific implementation details for that release."],["The structure includes a static `header_name()` function, but the provided description does not detail it, other than to indicate a return type of `char const *`."],["HTTP Entity Tags (ETags) are used to allow applications to only execute a query if the target resource matches the expected state."]]],[]]
