Introduce 503 error when nodes are all unavailable.

In rare situations when all nodes are down or in maintenance mode and
no workers can service a request, we return a 503 to the user.

COUCHDB-3289
2 files changed
tree: 1f5fb28ea194ac6c4d514bb1355435bf126d2ab2
  1. include/
  2. priv/
  3. src/
  4. test/
  5. .travis.yml
  6. LICENSE