You can also use XRay to fetch all the rel values on a page, merging the list of HTTP `Link` headers with rel values with the HTML rel values on the page.
```php
$xray = new p3k\XRay();
$xray->http = $this->http;
$rels = $xray->rels('https://aaronparecki.com/');
```
This will return a similar response to the parser, but instead of a `data` key containing the parsed page, there will be `rels`, an associative array. Each key will contain an array of all the values that match that rel value.
```
$rels = Array
(
[url] => https://aaronparecki.com/
[code] => 200
[rels] => Array
(
[hub] => Array
(
[0] => https://switchboard.p3k.io/
)
[authorization_endpoint] => Array
(
[0] => https://aaronparecki.com/auth
)
...
```
### Customizing the User Agent
To set a unique user agent, (some websites will require a user agent be set), you can set the `http` property of the object to a `p3k\HTTP` object.
```php
$xray = new p3k\XRay();
$xray->http = new p3k\HTTP('MyProject/1.0.0 (http://example.com/)');
$xray->parse('http://example.com/');
```
## API
XRay can also be used as an API to provide its parsing capabilities over an HTTP service.
@ -262,6 +323,15 @@ Other properties are returned in the response at the same level as the `data` pr
* `code` - The HTTP response code returned by the URL. Typically this will be 200, but if the URL returned an alternate HTTP code that also included an h-entry (such as a 410 deleted notice with a stub h-entry), you can use this to find out that the original URL was actually deleted.
## Rels
There is also an API method to parse and return all rel values on the page, including HTTP `Link` headers and HTML rel values.
```
GET /rels?url=https://aaronparecki.com/
```
## Token API
When verifying [Private Webmentions](https://indieweb.org/Private-Webmention#How_to_Receive_Private_Webmentions), you will need to exchange a code for an access token at the token endpoint specified by the source URL.
