Encoding does not work for non control characters

[bechhansen]

We have an issue where encoded Danish characters are not re-encoded when send to target.

When we get an request to https://source.com/test_%C3%A6%C3%B8%C3%A5.html it is proxied as https://destination.com/test_æøå.html,

After looking at the code I think non control characters like e.g. Danish characters are are never encoded before send to the destination.

[dsmiley]

They don't need to be re-encoded so it's valid; right?
Any way; I sympathize with the fact that the proxy is altering the percent encoding choice when perhaps it shouldn't. PR welcome.