---
title: "Back-end configuration | Customer's Canvas On-Premises"
canonical: "https://customerscanvas.com/docs/on-premises/preflight/config-backend/"
---

# Back-end configuration

> When you need to define custom settings, such as color profiles or paths to assets, you need to configure the Preflight Tool backend in the **AppSettings.config** file. For example, to apply a specific color profile to print files, set new values to the `CmykProfileFilePath` and `GrayscaleProfileFilePath` keys.

```xml
<appSettings>
  <add key="DisableFinishEndpoint" value="true"/>
  <add key="FileSystemProviderPath" value="./App_Data/files"/>
  <add key="CacheDirectoryPath" value="./App_Data/Cache"/> 

  <add key="FontsDirectoryPath" value="./App_Data/fonts"/>
  <add key="ColorProfilesDirectoryPath" value="./App_Data/ColorProfiles/"/>
  <add key="MockupsDirectoryPath" value="./App_Data/mockups"/>
  <add key="TempDataDirectoryPath" value="./App_Data/temp"/>
  <add key="ApiSecurityKey" value=""/>

  <add key="GrayscaleProfileFilePath" value="./App_Data/colorProfiles/defaultGrayscaleProfile.icm"/>
  <add key="CmykProfileFilePath" value="./App_Data/colorProfiles/defaultCmykProfile.icm"/>

  <add key="ServerBaseUrl" value=""/>
  <add key="FallbackFonts" value=""/>

  <!-- Configure DesignManager as asset storage -->
  <add key="AssetStorageApiKey" value="ApiKey" />
  <add key="AssetStorageEndpoint" value="http://localhost:56416/" />
  <add key="AssetStorageTenantId" value="6" />
  <add key="AssetStorageColorProfiles" value="false" />
  <add key="AssetStorageFonts" value="false" />
  <add key="AssetStorageStates" value="false" />
  <add key="AssetProcessorApiKey" value="" />
  <add key="AssetProcessorEndpoint" value="" />
  <add key="SaveStateRetryCount" value="3"/>

  <add key="MessageBusRabbitMQ" value=""/>
  <add key="MessageBusAzureServiceBus" value=""/>
</appSettings>	
```

Now, let's learn how you can configure the Preflight Tool using these parameters.

| Name | Description | Possible values |
|------|-------------|-----------------|
| DisableFinishEndpoint | If `true`, disables the `finish` endpoint, which includes hi-res rendering, and the client will receive a `403` response when attempting to access it. By default, this value is `true`. | boolean |
| FileSystemProviderPath | The storage of user files and the resulting JPG and PDF images. The default value is `"./App_Data/files"`. | folder path |
| CacheDirectoryPath | The location of the application path. The default value is `"./App_Data/Cache"`. | folder path |
| FontsDirectoryPath | The folder containing fonts that will be used for processing PSD files. The default value is `"./App_Data/fonts"`. | folder path |
| ColorProfilesDirectoryPath | The folder containing color profiles. The default value is `"./App_Data/ColorProfiles/"`. | folder path |
| MockupsDirectoryPath | The folder containing mockup images. The default value is `"./App_Data/mockups/"`. | folder path |
| TempDataDirectoryPath | The temporary folder. The default value is `"./App_Data/temp/"`. *Important! You must grant the **Modify** permission to this folder to the application pool in which the Preflight Tool is running.* | folder path |
| ApiSecurityKey | A unique API key for using the REST API. This value is an arbitrary string. | string |
| GrayscaleProfileFilePath | The path to the grayscale profile. | file path |
| CmykProfileFilePath | The path to the CMYK profile. | file path |
| ServerBaseUrl | A direct URL to your server. You can specify this parameter if your server runs behind a firewall. This URL will be used in links to previews and hi-res images. By default, this value is an empty string, and the URL is retrieved from IIS settings. | string |
| FallbackFonts | The PostScript name of the font to substitute a missing font with. If this value is an empty string, then this tool throws an exception when it meets an unknown font in a user's file. | string |
| AssetStorageApiKey | A unique API key to access the asset storage. This value is an arbitrary string. | string |
| AssetStorageEndpoint | The link to the asset storage. For example, `"http://localhost:56416/"`. | string |
| AssetStorageTenantId | The tenant identifier in the asset storage. | number |
| AssetStorageColorProfiles | If `true`, uses the color profiles defined in the asset storage. The default value is `false`. | boolean |
| AssetStorageFonts | If `true`, uses the fonts defined in the asset storage. The default value is `false`. | boolean |
| AssetStorageStates | If `true`, saves the state file as a private asset in asset storage. If `false`, saves to disk. | boolean |
| AssetProcessorApiKey | API key for the asset processor. | string |
| AssetProcessorEndpoint | URL of the asset processor gateway in the current environment. | string |
| SaveStateRetryCount | Number of save retry attempts. Default: `3`. | number |
| MessageBusRabbitMQ | Connection parameters of RabbitMQ. This string must be specified when you use the RabbitMQ message bus to get notifications about changing the content of the asset storage. For example, `"Host=localhost;VirtualHost=/;Username=guest;Password=guest"`. | string |
| MessageBusAzureServiceBus | Connection parameters of AzureServiceBus. This string must be specified when you use the AzureService message bus to get notifications about changing the content of the asset storage. | string |

:::note
If you do not define color profiles that should be used in color management, then the Preflight Tool applies the following default profiles:

*   SWOP (Coated) 20%, GCR, Medium profile for CMYK
*   Dot Gain 30% profile
:::