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I would like to write an external view function that throws when being executed on-chain, but does not throw when executing client-side. (for example when it is called through web3.js)

Is there a way to do this?

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    I very much doubt there's a way to do this. (If there is, it's likely to be considered a bug and fixed in the future.) I'm curious why you would want this.
    – user19510
    Commented Jul 9, 2018 at 19:20

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Edit 2021: Since solidity 0.5.0, the built-in function gasleft() replaced msg.gas.

∀ transactions: msg.gas > 0

Check for the gas amount !

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  • msg.gas was deprecated in solidity version 0.4.22, and it no longer compiles since version 0.5.0
    – Jesbus
    Commented Dec 20, 2021 at 0:28

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