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Why do I get a CORS error in Chrome when collecting data using the HTTP protocol, and how can I fix it?

Answer:

CORS (Cross-Origin Resource Sharing) errors occur in Chrome because some browsers are more restrictive regarding preflight OPTIONS requests. When collecting data via HTTP, if a service enforces HTTPS, it needs to redirect to the HTTPS version of the Tracardi API. Some browsers, like Chrome, do not allow AJAX calls to be redirected, which results in a CORS error.

How to fix this:

  1. Ensure HTTPS is used directly: Avoid the HTTP to HTTPS redirect by directly sending requests to the HTTPS version of the API. This eliminates the need for a browser to handle the redirect, preventing the CORS issue from occurring.

  2. Use the same protocol: Ensure the website collecting the data and the API are both served over HTTPS to avoid mixed-content issues and CORS problems due to protocol differences.