Will it CORS?
Nobody understands CORS, except this one magical web page
Will it CORS? launched on September 3, 2020 with 5 votes, #1,584 of 3,898 launches that month and more than 50% of that year's launches. The site was still online in September 2026, 6 years on.
What it does
If you do web dev, you too probably wake up at 4am screaming about CORS. The 1000th time, I decided to fix this once and for all. Tell this page what you're doing & what you want, and it'll explain what happens & what to do, all the way to ready-to-use code.
Literally nobody understands CORS, except this one magic web page
On mobile? Send a link to your computer to download HTTP Toolkit there: Cross-Origin Resource Sharing (CORS) is how browsers decide how web applications can communicate with other services. Restricting this is important for security, but it's hard to understand how CORS works, which means sending HTTP requests to APIs can be difficult & confusing. Tell this magic CORS machine what you want, and it'll tell you exactly what tofrom httptoolkit.com
Does a similar job
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Test CORS online with our free CORS tester. Check CORS on any URL for free.
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All-in-one resource for understanding CORS headers, including usage, common errors and code examples.
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