Static router produce double slash

[diondirza]

Version

4.0.0-beta.5

Test Case

Use it on isomorphic react app

Steps to reproduce

using StaticRouter without basename props
<StaticRouter location={request.url} context={routerContext}>
and have Link with prop to /home
<Link to={'/home'}>

Expected Behavior

Render result:
<a href="/home' />

Actual Behavior

Render result:
<a href="//home" />

I got this warning from my client console when I upgrade to latest beta,

Warning: React attempted to reuse markup in a container but the checksum was invalid. This generally means that you are using server rendering and the markup generated on the server was not what the client was expecting. React injected new markup to compensate which works but you have lost many of the benefits of server rendering. Instead, figure out why the markup being generated is different on the client or server:
 (client) href="/home" data-reactid="21
 (server) href="//home" data-reactid="21

and lead me to find this culprit.

[PEM--]

Confirmed for me as well.

[pshrmn]

Fixed in #4484