HTTP topic

Browser origins

An origin is a browser security boundary built from scheme, host, and port. This cluster connects that identity model to cookies, CORS checks, preflight exchanges, and the HTTP fields developers can inspect.

Recommended foundation

Start here

This entry establishes the shared model used by the references, diagnostics, and experiments below.

Learn

Separate cookies, origins, and sites

Keep host and path cookie scope distinct from origin and same-site browser boundaries.

Browser origins

Learn

1 reviewed entry

intermediate
Understand the browser CORS flow
CORS is a browser response-sharing protocol layered on HTTP, not proof that the network request failed.

Browser origins

Reference

2 reviewed entries

intermediate
Access-Control-Allow-Origin field
Access-Control-Allow-Origin identifies which requesting origin may read a CORS response.
intermediate
Origin field
Origin identifies the source origin associated with a request without a path.

Browser origins

Glossary

1 reviewed entry

beginner
Origin
An origin is the scheme, host, and port tuple associated with a resource or request context.

Browser origins

Start here

Separate cookies, origins, and sites

Learn

Understand the browser CORS flow

Reference

Access-Control-Allow-Origin field

Origin field

Glossary

Origin