Custom host server Question

[dtracers]

For local testing we use google app engine to host files and we do custom url redirects.

for example

/src/* is actually /src/main/src/* on the local machine.

So all we really need is a browser so we can use local browser testing. (Not integration)
We can't use phantom because we are using new webcomponents that are only supported in the very recent chrome and firefox

I am a little confused on if we can just open up pages on localhost and they work or if we need to change selenium so it works with the url rerouting.

Thanks in advance for any help!