Customize the Host header in shadow mirrored request

[Mark Vincze]

Hi all,

I'm doing shadow mirroring by using the request_mirror_policy. My config (simplified) looks like this:

static_resources:

  listeners:

  - name: listener_0

    filter_chains:

    - filters:

      - name: envoy.http_connection_manager

        config:

          stat_prefix: ingress_http

          route_config:

            name: local_route

            virtual_hosts:

            - name: main-host

              domains: ["*"]

              routes:

              - match:

                  prefix: "/"

                  query_parameters: [ { name: "somequeryarg", value: "value", regex: true } ]

                route:

                  host_rewrite: main-cluster.example.com

                  cluster: main-cluster

                  request_mirror_policy:

                    cluster: mirror-cluster

                    runtime_fraction: { default_value: { numerator: 10 } }

  clusters:

  - name: main-cluster

    type: STRICT_DNS

    hosts: [{ socket_address: { address: main-cluster.example.com, port_value: 80 }}]

  - name: mirror-cluster

    type: STRICT_DNS

    hosts: [{ socket_address: { address: mirror-cluster.example.com, port_value: 80 }}]

So I'm mirroring 10% of the traffic to mirror-cluster.

If I understand the docs correctly, when Envoy sends the mirrored requests, it appends -shadow to Host header.

Is there any way to customize this, and specify a different Host header for the mirrored requests?

Thanks!

Mark Vincze

[Harvey Tuch]

Not today, this would make sense to file as a feature request at https://github.com/envoyproxy/envoy/issues.

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[Mohamed Aboessa]

I know this is pretty old, but they added a similar feature here https://www.envoyproxy.io/docs/envoy/latest/api-v3/extensions/filters/http/ext_proc/v3/ext_proc.proto using. `host_rewrite_literal`