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    How to enable CORS headers for various types of video hosting

    Cross-origin resource sharing (CORS) is a mechanism allowing websites to request restricted resources from other websites with different domain. CORS defines the rules that are used when server is trying to determine whether it is safe to share resources or not.

    Both HLS Streaming and our Thumbnail generator require enabled CORS headers to work properly. Here's a guide on how to do it for various types of video hosting.

    • AWS
      • S3
      • CloudFront
      • Clearing CloudFront cache
    • BunnyCDN
    • DigitalOcean Spaces
    • KeyCDN

    AWS

    Enabling CORS in Amazon S3

    To configure CORS in Amazon S3, simply copy this content into your bucket properties:

    [
        {
            "AllowedHeaders": [
                "*"
            ],
            "AllowedMethods": [
                "GET",
                "POST",
                "PUT"
            ],
            "AllowedOrigins": [
                "*"
            ],
            "ExposeHeaders": [],
            "MaxAgeSeconds": 3000
        }
    ]
    
    

    To allow this in Amazon S3, you just need to:

    1. Open your source bucket.

    2. Go to Permissions and you will see a button Add CORS Configuration.

    3. Paste there the code written above and save.

     

    Enabling CORS in CloudFront

    To allow CORS with your CloudFront distribution, you will need to do some additional configuration:

    1. Select the distribution you want to use (if you don't have an existing distribution, check this guide - Serving Private Videos via CloudFront)
    2. Go to Distribution Settings -> Bahaviors. You can edit the Default behavior
    3. Go to Forward Headers and change None (Improves Caching) to Whitelist
    4. A new property will appear - Whitelist Headers. Here you should see three default headers. Select all of them and click Add. They will move to the box on the right and you can save the changes by clicking Yes, Edit in the bottom right corner.
       

      Changing behaviour settings in CloudFront
       
    5. It will take some time for these changes to take effect due to caching of the CloudFront network.

    Clearing the CloudFront Cache

    If you have an existing distribution that is already used for serving video content and you add the CORS headers, or do any other change that can affect the videos, you should clear the cache on all edge servers. This way you can make sure that the changes are really applied instead of using the cached old version.

    To clear the cache, you will have to create an invalidation in the distribution settings.

    1. Start with opening the settings of the distribution you want and go to the Invalidations tab. There click on the Create Invalidation button.
      Creating new invalidation in CloudFront settings
    2. Now you can select, which objects (in this case videos) you want to clear from the cache. We of course want to clear them all, so we can use the "*" wildcard. Therefore, just write "/*" - that specifies all the objects in the source bucket of your distribution. Afterwards click the Invalidate button.
      Using the /* wildcard to clear the whole CloudFront cache
      Using the "*" wildcard to clear the whole CloudFront cache
    3. The invalidation will take a only a minute or two. You will see that it's finished when the status changes from "In progress" to "Completed".
    4. Wait for the invalidation process to finish
      Wait for the invalidation process to finish

    BunnyCDN

    To enable CORS headers in BunnyCDN settings please follow these steps:

    1. Log in to your BunnyCDN profile.

    2. Go to Pull zones in the general menu and open designated pull zone

     

    Bunny CDN Pull Zones menu
     

    3. Go to Headers settings

     
     

    4. Fill in designated file extensions that you want to allow. Add m3u8 and ts to cover needs to HLS stream playback. Also add mp4 if you are using it for video to allow the FV Player screenshot feature to work.  Adding vtt will also allow you to serve subtitles.

    5. Save your settings


    DigitalOcean Spaces

    To enable CORS headers in DigitalOcean Spaces please follow these few steps:

    1. Log into your DigitalOcean account, enter Spaces section, pick desired space and go to it's Settings tab

     

    Settings tab of DigitalOceanSpaces space
     

    2. Open CORS Configuration settings and fill in following settings:

    2.1 Origin: fill in your domain, if you're using www. or https:// in your domain name, make sure to fill that too

    2.2 Allowed Methods: pick GET and HEAD 

    2.3 Allowed Headers: (please allow following headers)

    Access-Control-Allow-Methods

    Access-Control-Allow-Origin

    Origin

    Range

    3. Hit Save Options


    KeyCDN

    1. Log into your account.

    2. Go to Zones.

    3. Select your desired zone and click on Manage and open Edit option.

     

    Editing a KeyCDN zone
     

    4. Then select Show advanced features and set CORS Headers to enabled.

     
     

    5. Save your settings.


    Besides bringing new features into FV Player we also focus on explaining and helping our users with using those which are already part of our player. You can help us a lot with it by giving us valuable feedback.

    So if you have any tips or questions, don't hesitate and contact us via our Forums!

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