balance service with akka http

Simple balance service that shows how to use akka-http and akka-streams to build microservices.

start server:

sbt run

see home page

http://localhost:8080/

list balances

http://localhost:8080/balances

execute collect total with callback

curl -i http://localhost:8080/balances/mark/total?callback=http://localhost:8080/ext/callback/balance/total

HTTP/1.1 200 OK
Server: akka-http/2.3.12
Content-Type: text/plain; charset=UTF-8
Content-Length: 2

OK

check health

http://localhost:8080/health