Access control allow origin header axios4/11/2024 "Origin, X-Requested-With, Content-Type, Accept"Īpp.listen(port, () => console.log(`Listening on port $`)) Res.setHeader("Access-Control-Allow-Origin", "") Add Access Control Allow Origin headers const express = require("express") Ĭonst port = _PORT || 8000 The server sends a response with the header Access-Control-Allow-Origin. Let's say we have an origin up on that serves up this resource on /api endpoint. We expect to see the string Hello passed by origin A in the browser console of origin B. We are going to call with this endpoint by creating a client on origin B and then use fetch to request the resource. We are going to build a server on origin A which will send a string of Hellos to an api endpoint. You can check out this code on my GitHub repo.
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