Run command:
go get gopkg.in/mgo.v2

Run server code:
go run server.go

Run client code:
go run client.go --request_url=http://127.0.0.1:8000/forum/boardsfromcrawler
go run client.go --request_url=http://127.0.0.1:8000/forum/boardsfromdb

go run client.go --request_url=http://127.0.0.1:8000/forum/topicsfromcrawler/18.0
go run client.go --request_url=http://127.0.0.1:8000/forum/topicsfromdb/18.0

go run client.go --request_url=http://127.0.0.1:8000/forum/contentfromcrawler/4757.0
go run client.go --request_url=http://127.0.0.1:8000/forum/contentfromdb/4757.0