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