A Backoff
header will be added to the success responses (>=200 and <400) when the server is under heavy load. It provides the client with a number of seconds during which it should avoid doing unnecessary requests.
Backoff: 30
Note
The back-off time is configurable on the server.
Note
In other implementations at Mozilla, there was X-Weave-Backoff
and X-Backoff
but the X-
prefix for header has been deprecated since.
A Retry-After
header will be added if response is an error (>=500). See more details about error responses <error-responses>
.