Seem familiar? With over 10,000 questions posted under the cors tag on StackOverflow, it is one of the most common issues that plague frontend developers and backend developers alike. You open up the console and see either “No Access-Control-Allow-Origin header is present on the requested resource,” or “The Access-Control-Allow-Origin header has a value that is not equal to the supplied origin” written in red text, indicating that your request was blocked by CORS policy. Therefore, I assumed that this package may not work successfully during deployment, so I tried to code my CORS configuration manually.Consider the following situation: you’re trying to fetch some data from an API on your website using fetch() but end up with an error. However, this did not work and the error kept showing as:Īccess to XMLHttpRequest has been blocked by CORS policy: No ‘Access-Control-Allow-Origin’ header is present on the requested resource. To make the health check process faster, I wrote path for it: app.get("/healthz", (req, res) => What you return on your health check path is up to you, but we recommend running quick sanity checks (like a simple database query) and returning an “OK” 200 response or an empty 204 response if the app is healthy. Set preflightĪllowMethods.includes(req.headers) &ĪllowHeaders.includes(req.headers) The following code works fine on Firefox, but Chrome seems to send preflight request twice with one fail and one succeed which turns out to be a bug on chrome itself. I tried to connect my static site on render to my local server for debugging my request on my browser developer tool. Res.setHeader("Access-Control-Max-Age", 7200) Chromium (starting in v76) caps at 2 hours (7200 seconds). Firefox caps this at 24 hours (86400 seconds). Res.setHeader("Access-Control-Allow-Private-Network", true) Res.setHeader("Access-Control-Allow-Credentials", true) "Content-Type, Authorization, X-Content-Type-Options, Accept, X-Requested-With, Origin, Access-Control-Request-Method, Access-Control-Request-Headers" "GET,HEAD,PUT,PATCH,POST,DELETE,OPTIONS,CONNECT,TRACE" My solution for “No ‘Access-Control-Allow-Origin’ header” : const express = require("express")
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