Redirect http traffic to https when listening on https protocol

[axos88]

• Operating System: n/a

• Node Version: 10.20.1

• NPM Version: 6.14.4

• webpack Version: 4.41.2

• webpack-dev-server Version: 3.9.0

• Browser: chrome, but not really important.

• This is a bug

• This is a modification request

Expected Behavior

When listening on https protocol, any received http traffic should be (optionally) redirected to https, or handled without initiating an ssl context.

Actual Behavior

Connection is closed prematurely. One needs to type in https://localhost:4200 manually instead, which is not automatically saved into the quicksearch bar of chrome.

For Features; What is the motivation and/or use-case for the feature?

When developing an application locally, typing in say localhost:4200 into the address bar opens a connection using http protocol by default, and chrome returns an ERR_EMPTY_RESPONSE error, wihtout trying to connect using https.

A 302 response to the same endpoint with https protocol would take care of this issue.

A most simple implementation would take a look at the first few bytes of the incoming stream before initiating the ssl context and if it equals GET, it would handle the connection in a special manner, returning a 302.

[alexander-akait]

Sounds good, but we need additional server on http for that, related #126

[alexander-akait]

Let's close in favor #126