client request configuration

[jjdodojohn]

I think it would be better to set the client request url as a settable parameter since we need to replace all "http://localhost:3080" if the client and api are in different machine.

[DavesDevFails]

Yeah, probably best to set both SERVER_URL and CLIENT_URL as configurable parameters.

[wtlyu]

#26 replace all localhost:3080 request to relative path.
but I agree that SERVER_URL and CLIENT_URL are better design