Upstream HTTP Filter Support for Dynamic Forward Proxy

[arkodg]

Description:

HTTP Filters can be applied to a specific xDS Cluster using the http_filters field .
Can the Dynamic Forward Proxy HTTP Filter be supported as an upstream filter ?

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Any extra documentation required to understand the issue.

[mattklein123]

What is the goal of this exactly? I don't understand what this would do as an upstream filter.

[arkodg]

I would ideally like to model the Dynamic Forward Proxy feature as an input Backend resource in Envoy Gateway. This Backend resource has a 1:1 mapping with an xDS Cluster. So by representing Dynamic Forward Proxy as a Backend Resource (for the end user, its a Backend of type ForwardProxy that discovers endpoints based off DNS of the Host header), I can scope all the xDS configuration (dynamic forward proxy http_filter + special cluster type ) to the xDS Cluster, so only requests meant for this backend executes this filter + cluster, instead of all requests hitting the listener (above example in envoy docs has the filter defined in the hcm)

[wbpcode]

@arkodg could this address your problem because now we can bypass the filter now ?#38237

[arkodg]

thanks @wbpcode, will try it out and share an update here