Support these block patterns:

• [[url]] → http://127.0.0.1:8080
• [[url.protocol]] → http://
• [[url.host]] → 127.0.0.1:8080
• [[url.port]] → :8080
• [[url.path]] → /foo/bar
• [[url.query]] → ?foo=bar&baz=qux
• [[url.current]] → http://127.0.0.1:8080/foo/bar/1?foo=bar&baz=qux