Why am I getting 408 and 429 errors when testing with Leanplum SDK in dev mode?
When testing in dev mode you connect to our dev server via live web socket. This behaves differently to testing in production mode, as all changes sync instantly. We impose a rate limit of 1 QPS on our dev server.
We recommend creating a separate Leanplum dashboard for dev testing, (e.g. My Company Dev), so you are able to test with its production API keys in production mode. This way you will be able to test the true production experience also avoiding rate limiting associated errors.