Proposal: add server config for static mocks via webpack-dev-server

[kdimatteo]

When developing large apps which require many static mocks, we need to run a separate instance of a server so that we can proxy API calls so an endpoint which return known results.

Since ng serve already invokes webpack-dev-server, we just need a way to pass a setup() method (webpack docs) to handle the routing.

...this save us from spinning up a second server.

PR is open, hoping to get some perspective whether this approach makes sense.

[filipesilva]

Closing with reasoning on #3661 (comment).

The proxy docs can be found at https://github.com/angular/angular-cli/wiki/stories-proxy.

[eikishi01]

I'm thinking that maybe the reason given in #3661 is a different use case, yeah you can add proxies to the configuration to point to ANOTHER api server how ever I also consider it an overkill to create a server instance to serve simple JSON when you already have a running server with ng serve and you just need to add the paths mapping with the setup method already available in webpack-dev-server

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