January 2019
Intermediate to advanced
460 pages
10h 33m
English
Content preview from Hands-On Full-Stack Web Development with GraphQL and React
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CORS in Express.js
We want our GraphQL API to be accessible from any website, app, or system. A good idea might be to build an app or offer the API to other companies or developers so that they can use it. When using APIs via Ajax, the main problem is that the API needs to send the correct Access-Control-Allow-Origin header.
For example, if you build the API, publicize it under https://api.example.com, and try to access it from https://example.com without setting the correct header, it won't work. The API would need to set at least example.com inside the Access-Control-Allow-Origin header to allow this domain to access its resources. It seems a bit tedious, but it makes your API open to cross-site requests which you should always be aware ...
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