Retaining a HEAD request
Difficulty level: Medium
Objective
In this challenge, a Fastly service is receiving a HEAD request followed by a GET request, for the same URL. By default in VCL services, Fastly transforms HEAD requests into GET requests, so that the entire object being requested is loaded into our edge cache. However, you may want HEAD requests from clients to be passed to origin as HEAD.
If the backend receives a HEAD request, it won't include the body in the response, so it's also important to ensure that subsequent GET requests do receive the body content that they expect.