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# url

A URL object derived from the components object.

```
var url: URL? { get }
```

## Discussion

If the receiver has an authority component (user, password, host, or port) and a path component, then the path must either begin with `"/"` or be an empty string. Otherwise, this property contains `nil`.

If the receiver *does not* have an authority component (user, password, host, or port) and has a path component, the path component must not start with `"//"`. If it does, this property contains `nil`.

If the receiver has `nil` values for all component properties, such as when initializing with [`init()`](/documentation/Foundation/NSURLComponents/init()), this property returns an `NSURL` object with an empty string, because a URL always has a path—even if it’s an empty string.

This property can be used only to obtain a URL based on the values of the other properties. To configure a components object based on an existing URL, call either the [`componentsWithURL:resolvingAgainstBaseURL:`](/documentation/Foundation/NSURLComponents/componentsWithURL:resolvingAgainstBaseURL:) or [`init(url:resolvingAgainstBaseURL:)`](/documentation/Foundation/NSURLComponents/init(url:resolvingAgainstBaseURL:)-3bbte) method.

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