-- Given a url string
url = "http://sam:[email protected]:3000/products/kids?color=red&age=10#toys/1"

Erl.parse url 

-- Returns a Erl.Url record:

{
  protocol: "http",
  username: "sam",
  password: "pass",
  host: ["api", "example", "com"],
  port': 3000,
  path: ["products", "kids"],
  hash: "toys/1",
  hasTrailingSlash: False,
  query: Dict {
    "color": "red",
    "age": "10"
  }
}

-- Construct an empty Erl.Url record:

url = 
  Erl.new

-- Modify the protocol
{ url | protocol = "https" }

-- Modify host
{url | host = ["api", "acme", "com"] }

-- Modify port
{ url | port' = 9000 }

-- Modify path
{url | path = ["users", "1"] }

-- Modify path by appending segments
Erl.appendPathSegments url ["users", "1"]

-- Modify hash
{url | hash = "users/1" }

-- Clear query string
Erl.clearQuery url

-- Add one query string key/value (patches previous query string)
Erl.addQuery "key" "value" url

-- Remove one query string key/value
Erl.removeQuery "key" url

-- Replaces query string with key/value (removes any previous keys)
Erl.setQuery "key" "value" url

-- Given a Erl.Url record (url):

Erl.toString url 

-- Returns the url as string:

"http://www.foo.com:2000/users/1?k=2&q=1#a/b"