A fork of net/url with immutable patterns for URLs.
To "mutate" a URL's Query string, you will take the query, mutate it, and then call SetQuery, which will return a new immutable URL.
import "github.com/clipperhouse/immutable-url"
u := url.Parse("https://foo.com/bar?abc=123")
q := u.Query()
q.Set("abc", "456")
u2 := u.SetQuery(q)SetPath is a similar idea.