Conditionally serving different content based on header in initial backend response

I’m using Fastly in front of S3 to serve a static site. Since I’m using S3 as an origin via its REST API (for TLS between Fastly and S3) I need to setup things like courtesy redirects for example.com/dirname (note absence of trailing /) to example.com/dirname/index.html.

My current plan is to add objects to my bucket named after each directory which contain a header giving the key of the corresponding index.html object that should be served.

This means that my Fastly/VCL config needs to check the header of the initial backend response and conditionally request and return a different object from S3.

What’s the best way to do this with Fastly configs? Do I need to setup custom VCL?

Cassandra Dixon

July 22, 2016 22:50

Hi Jonathan,

An option that can help with your scenario would be to do a redirect based on the header. This can be done in the app or with custom VCL.

For instance, in the app

Create a header to parse and store the directory value
Create a redirect Help Guide - HTTP Redirects on the edge

For the location header you can have it be the following:

Source : "http://example.com/" req.http.X-Dirname "/index.html"

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