Priority
Both directions
Signals how urgent this request is and whether it may be delivered out of order.
| On the wire | Priority: … |
|---|---|
| Category | Both directions |
Headers that can appear on either side.
How to read this
- The first digit of a status code carries the meaning: 4 means the request, 5 means the server.
- 404 means "not there"; 403 means "there, but not for you". Swapping them makes debugging slower.
- Header names are case-insensitive — Content-Type and content-type are the same header.
- Caching and CORS problems usually come down to one header line, visible in the browser’s network tab.
Frequently asked questions
Q. What does HTTP Priority mean?
Signals how urgent this request is and whether it may be delivered out of order.
Q. What does Priority look like on the wire?
It travels as Priority: …
Q. Where does Priority appear?
In both directions.
Q. What group does Priority belong to?
The both directions group; the rest of that group is listed further down.