preflight is a Cross-Origin Resource Sharing testing tool for your terminal. Cross-Origin Resource Sharing is a relevant security mechanism every web developer has to face at a certain point in their projects. preflight is here to help. It was created to support you in this process by speeding up the configuration and testing.

preflight will emulate the browsers preflight requests in your terminal. Just provide the target you want to pre-fly, one or more origins the request will be made from and preflight will tell you if configured your Cross-Origin Resource Sharing Response Headers correctly.

preflight is available for MacOSX, Linux and Windows. You can find the binaries in GitHubs release section.

This is an open source project and your feedback is essential. If you discover bugs or other inconsistencies please open a new issue. If you want to share your ideas on how to improve preflight we're happy to hear from you in the discussions section.