Previewing and testing VCL

      Last updated May 22, 2020

    Any time you upload VCL files you can preview and test the VCL prior to activating a new version of your service.

    Previewing VCL before activation

    To preview VCL prior to activating a service version.

    1. Log in to the Fastly web interface and click the Configure link.
    2. From the service menu, select the appropriate service.
    3. Click the Edit configuration button and then select Clone active. The Domains page appears.
    4. Click the Show VCL link.

      the VCL button

      The VCL preview page appears.

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