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-Image Proxy
-===========
-
-To prevent mixed content warnings on SSL pages served from your RSS reader you might want to use an assets proxy.
-
-Images url will be rewritten to be downloaded through the proxy.
-
-Example:
-
-```html
-<img src="http://example.org/image.png"/>
-```
-
-Can be rewritten like that:
-
-```html
-<img src="http://myproxy.example.org/?url=http%3A%2F%2Fexample.org%2Fimage.png"/>
-```
-
-Currently this feature is only compatible with images.
-
-There is several open source SSL image proxy available like [Camo](https://github.com/atmos/camo).
-You can also write your own proxy.
-
-Usage
------
-
-There two different ways to use this feature, define a proxy url or a callback.
-
-### Define a proxy url
-
-A proxy url must be defined with a placeholder `%s`.
-The placeholder will be replaced by the image source urlencoded.
-
-```php
-$config = new Config;
-$config->setFilterImageProxyUrl('http://myproxy.example.org/?url=%s');
-```
-
-Will rewrite the image source like that:
-
-```html
-<img src="http://myproxy.example.org/?url=http%3A%2F%2Fexample.org%2Fimage.png"/>
-```
-
-### Define a callback
-
-Your callback will be called each time an image url need to be rewritten.
-The first argument is the original image url and your function must returns the new image url.
-
-Here an example if your proxy need a shared secret key:
-
-```php
-$config = new Config;
-
-$config->setFilterImageProxyCallback(function ($image_url) {
-    $key = hash_hmac('sha1', $image_url, 'secret');
-    return 'https://mypublicproxy/'.$key.'/'.urlencode($image_url);
-});
-```
-
-Will generate an image url like that:
-
-```html
-<img src="https://mypublicproxy/4924964043f3119b3cf2b07b1922d491bcc20092/http%3A%2F%2Ffoo%2Fimage.png"/>
-```