RoutingProxy.proxyRequest modifies the options parameter

Problem

Node: v0.7.6 http-proxy: v0.8.0 (via NPM) MacOS Problem: RoutingProxy.prototype.proxyRequest modifies the 'options' parameter by adding new properties to the object. This is unexpected and leads to unintended consequences as described below. I was expecting the API to not modify the options parameter. Scenario: I have a single node process that runs two reverse proxies on two different TCP ports: an HTTPS->HTTP proxy and HTTP->HTTP proxy. The two reverse proxies use two instances of RoutingProxy, but the data structure that defines routing rules is shared between the two proxies. Specifically, the object instance I pass as 'options' parameter to RoutingProxy.proxyRequest has a global lifetime. What I notice is that whenever the first routing request is HTTPS, the modifications RoutingProxy.proxyRequest makes in the 'options' parameter cause subsequent HTTP routing requests to fail. It appears that the RoutingProxy is picking HTTPS module instead of HTTP to make the outbound request to the backend.