loading
loading
Key-value metadata sent with HTTP requests and responses.
Headers carry details like content type, authorization, caching, cookies, locale, and CORS rules. They are invisible in the page but often decide how a request is handled.
Plainly
Think of Headers as roads and power for the app city. Key-value metadata sent with HTTP requests and responses.
In practice
Use it when local behavior needs to become a reachable, reliable deployed service. In practice, define the owner, input, output, and failure mode before you rely on it.