How long does Chrome remember a 301 redirect?

In either Chrome or Firefox, you can refresh the redirect by typing "view-source:redirect.yoursite.com" and hitting enter. Then, refresh that page. Now, that should force Chrome or Firefox to refresh the redirect.

Go to chrome://net-internals and at the far right open the drop-down and choose "Clear Cache". As of version 48, this was the only thing that worked for me to clear a cached 301.

Update: Unfortunately, as of version 71 (Dec 2018) Google has removed the net-internals feature.

The "view-source:"-solution does not work for me in Google Chrome; but using the developer tools and setting "disable cache" to true/checked in the Network-tab forces a re-evaluation. BTW: temporary circumvention can be achieved in an anonymous-session (Ctrl+Shift+N) or by adding some fake query-argument, like "?foo=bar", to the URL.

I resolved this by opening dev tools (F12), click "Network", then click the "Preserve log" checkbox, and make the request that results in the cached 301. Right-click the request that results in the 301 and click "clear browser cache". Try again and then 301 should no-longer be cached.