HTTP-500 Error on Invalid JSON with Content-Type: application/json

[domwebber]

I'm unsure whether this is the intended behaviour, however, the following cURL will result in a 500 status code.

curl -X POST -H "Content-Type: application/json" -d 'not-json' http://localhost:8080

Looks to stem from:

docker-http-https-echo/index.js

Lines 107 to 109 in e541281

	if(req.is('application/json')){
	echo.json = JSON.parse(req.body)
	}

PR: #74