Expose request headers in Liquid available context #819
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The goal of this PR is to cover the use case mentioned in #744 (comment)
The objective is to be able to combine the conditional policy with the upstream one and be able to choose an upstream based on a request header. In order to do that, I needed to expose the request headers in the
ngx_variablemodule. I also added an integration test that checks that it works as expected.