HTTP proxy for API testing website od Đoàn Thuận Thành

Some features in test.onapis.com:
- Make HTTP requests
- Support write API documentation then share them to others for implementation
- Easy to share your API to others in teams via a link
- Support to add or import many APIs into bookmark list to reuse later or share them to others.
- Support generate "api-testing-doc" test step which is APIs testing library

Feature in this extension:
- Make requests which are sent from test.onapis.com pass Cross-Origin Resource Sharing issue