7170f9d which added support for using a promise as timeout in $resource, introduced a bug (where you had to re-create the resource class after every cancelled request and failing to do so would abort all subsequent calls). See #12657 (comment) for more context.

This has been fixed in v1.5.x with #13210, but we need to also fix it on v1.4.x (#13210 is not suitable for backporting to v1.4.x since it adds a new feature and changes the behaviour of $resource to some extent).

As discussed in #13210 (comment), for v1.4.x we need to:

• Revert 7170f9d.
• Update the docs to explain that promise as timeout is not supported.
• Log a warning when someone does it.