A working, precise model of Cross-Origin Resource Sharing (CORS): what the same-origin policy restricts and why CORS exists as a deliberate, narrow exception to it, the full preflight and Access-Control header exchange, and the specific misconfiguration patterns, led by origin reflection and the credentials combination, that recur across real applications. The course draws a firm boundary between CORS and server-side authorization, and between CORS and Cross-Site Request Forgery, then closes with how to design, test, fix and continue to monitor a CORS policy that grants exactly the access it means to.
Nothing. Every course, exam, and certificate on the catalog is free — including retakes. All you need is a free Safeguard account.
None. The flagship course, Safeguard Certified Practitioner, is a beginner-level course — basic familiarity with how software is built helps, but every exam question is answerable from the lessons themselves.
You can retake it after a 24-hour cooldown, as many times as you need. Retakes are free, and each attempt draws a fresh random set of questions.
The Safeguard Certified Practitioner credential is valid for 24 months from issue. The expiry date is printed on the certificate and shown live on its public verification page. Renewing means passing the current exam again.
