when can i set headers express code example

Example 1: set headers in express

response.header("Access-Control-Allow-Origin", "*");
    response.header("Access-Control-Allow-Headers", "Origin, X-Requested-With,Content-Type, Accept");
    response.header('Access-Control-Allow-Methods', 'GET,PUT,POST,DELETE')

Example 2: in express how do you set the location header

res.location('/customers/' + inst._id)1

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Csharp Example

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