Some clients try to use CORS Anywhere, even for same-origin requests...
Add a new setting "redirectSameOrigin" to not waste server resources on
proxying such requests.
Fixes#42
Node.js has forbidden header names with spaces in
6192c9892f.
The next error is thrown when the test sets the "some header" header:
Uncaught TypeError: Header name must be a valid HTTP Token ["some header"]
To fix it, replace spaces with dashes.