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+---
+description: Configure Fastly Image Optimizer.
+---
+
+# Fastly Image Optimizer (Fastly IO)
+
+The Fastly Image Optimizer (Fastly IO) is an external service that provides real-time image optimisation for multiple input and output formats.
+It serves and caches image requests from your origin server, making your website faster and more efficient.
+
+To be able to configure this feature, you need [Fastly IO subscription](https://docs.fastly.com/en/guides/about-fastly-image-optimizer).
+
+## Enable shielding
+
+To use Fastly Image Optimizer, you need shielding.
+To enable it, follow steps in Fastly documentation, [Enabling and disabling shielding](https://developer.fastly.com/learning/concepts/shielding/).
+
+Before proceeding, make sure that you have the [`snippet_re_enable_shielding.vcl`](https://github.com/ibexa/fastly/blob/main/fastly/snippet_re_enable_shielding.vcl) configuration file added to your project.
+
+You can add it using Fastly CLI: 
+ 
+```bash
+- fastly vcl snippet create --name="Re-Enable shielding on restart" --version=active --autoclone --priority 100 --type recv --content=vendor/ibexa/fastly/fastly/snippet_re_enable_shielding.vcl
+- fastly service-version activate --version=latest
+```
+
+Next, you need to choose the [Shield location](https://developer.fastly.com/learning/concepts/shielding/#choosing-a-shield-location) from the Shielding menu in Fastly web interface as specified in [Fastly IO documentation](https://docs.fastly.com/en/guides/shielding#enabling-shielding).
+
+## VCL configuration
+
+To manipulate your Fastly VCL configuration directly from the command line,
+you need to:
+
+- [install Fastly CLI](https://developer.fastly.com/learning/tools/cli#installing),
+- define `FASTLY_SERVICE_ID` and `FASTLY_KEY` environmental variables,
+- set restrictions on the optimiser by using [`ibexa_image_optimizer.vcl`](https://github.com/ibexa/fastly/blob/main/fastly/ibexa_image_optimizer.vcl). 
+
+This is an example VCL snippet uploaded by using the `vcl_recv` hook:
+
+```bash
+fastly vcl custom create --name="Ibexa VCL" --main --version=latest --autoclone  --content=vendor/ibexa/fastly/fastly/ez_main.vcl
+fastly vcl snippet create --name="Shielding" --version=active --autoclone --type recv --content=vendor/ibexa/fastly/fastly/snippet_re_enable_shielding.vcl
+```
+
+Fastly passes requests through the image optimizer by adding the `x-fastly-imageopto-api` header in `vcl_recv`.
+You need to restrict the optimizer by file path and extension to only apply to image requests:
+
+```vcl
+if (req.url.ext ~ "(?i)^(gif|png|jpe?g|webp)$") {
+    if (req.url.path ~ "^/var/([a-zA-Z0-9_-]+)/storage/images") {
+        set req.http.x-fastly-imageopto-api = "fastly";
+    }
+}
+```
+
+You can define what image formats will be included, for example: `gif|png|jpe?g|webp`
+and which paths should be used as a source of images, for example: `^/var/([a-zA-Z0-9_-]+)/storage/images`.
+For more configuration options, see [Enabling image optimization](https://developer.fastly.com/reference/io/#enabling-image-optimization).
+
+After you save this snippet or create your own, you can upload it from the command line using:
+
+```bash
+fastly vcl snippet create --name="Shielding" --version=active --autoclone --type recv --content=vendor/ibexa/fastly/fastly/snippet_re_enable_shielding.vcl
+```
+
+## Define SiteAccess for Fastly IO
+
+Fastly IO configuration is SiteAccess aware.
+You can define what handler should be used for a specific SiteAccess under `variation_handler_identifier`.
+You need to set it up as `fastly`, so Fastly IO can generate all image links.
+By default, it is set as `alias`, and it points to a built-in image optimizer.
+You can also set up a custom handler if your setup requires it.
+
+```yaml
+ibexa:
+    system:
+        my_siteaccess:
+            variation_handler_identifier: 'fastly'
+```
+
+You can also use environmental variables to configure a specific handler for a SiteAccess.
+See the example below to configure it with the `.env` file:
+
+```
+IBEXA_VARIATION_HANDLER_IDENTIFIER="fastly"
+```
+
+## Image configuration
+
+When you define image variation keys for Fastly IO, keep in mind
+that they should reflect variations in your original setup.
+The built-in image optimizer serves as backup to Fastly IO in case of misconfiguration,
+so it needs to be able to serve the same image variations.
+
+Fastly IO image filters are not compatible with our built-in filters,
+so you will not be able to reflect your original filters accurately with Fastly.
+The script below will help you find replacement filters within Fastly configuration for the basic filters.
+For more optimization options on Fastly side, see [Fastly IO reference](https://developer.fastly.com/reference/io/).
+
+To generate your original image configuration run:
+
+```bash
+php bin/console ibexa:fastly:migrate-configuration
+```
+
+Paste the configuration to `config/packages/ibexa.yaml` to define the same variations for Fastly IO:
+
+```yaml
+ibexa:
+    system:
+        default:
+            fastly_variations:
+                reference:
+                    reference: original
+                    configuration:
+                        width: 600
+                        height: 600
+                        fit: bounds
+                small:
+                    reference: reference
+                    configuration:
+                        width: 100
+                        height: 100
+                        fit: bounds
+                tiny:
+                    reference: reference
+                    configuration:
+                        width: 30
+                        height: 30
+                        fit: bounds
+                medium:
+                    reference: reference
+                    configuration:
+                        width: 200
+                        height: 200
+                        fit: bounds
+                large:
+                    reference: reference
+                    configuration:
+                        width: 300
+                        height: 300
+                        fit: bounds
+                gallery:
+                    reference: original
+                    configuration: { }
+                ezplatform_admin_ui_profile_picture_user_menu:
+                    reference: reference
+                    configuration:
+                        width: 30
+                        height: 30
+                        fit: bounds
+                        crop: '30,30,x0,y0'
+```
+
+You can select defined image variations during Content item creation in the image options.
+Variations can include different sizing options and other filters that are applied to the image.
+
+![Fastly Image Variations](img/fastly_variations.png)
diff --git a/docs/content_management/images/img/fastly_variations.png b/docs/content_management/images/img/fastly_variations.png
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diff --git a/mkdocs.yml b/mkdocs.yml
index 0b5e522528..2e899724d3 100644
--- a/mkdocs.yml
+++ b/mkdocs.yml
@@ -132,6 +132,7 @@ nav:
             - Configure Image Editor: content_management/images/configure_image_editor.md
             - Extend Image Editor: content_management/images/extend_image_editor.md
             - Add Image Asset from DAM: content_management/images/add_image_asset_from_dam.md
+            - Fastly Image Optimizer: content_management/images/fastly_io.md
         - Rich Text:
             - Extend Online Editor: content_management/rich_text/extend_online_editor.md
             - Create custom RichText block: content_management/rich_text/create_custom_richtext_block.md