# Dynamic forward proxy¶

## config.filter.http.dynamic_forward_proxy.v2alpha.FilterConfig¶

[config.filter.http.dynamic_forward_proxy.v2alpha.FilterConfig proto]

Configuration for the dynamic forward proxy HTTP filter. See the architecture overview for more information.

This extension may be referenced by the qualified name envoy.filters.http.dynamic_forward_proxy

Note

This extension is intended to be robust against untrusted downstream traffic. It assumes that the upstream is trusted.

{
"dns_cache_config": "{...}"
}

dns_cache_config

(config.common.dynamic_forward_proxy.v2alpha.DnsCacheConfig, REQUIRED) The DNS cache configuration that the filter will attach to. Note this configuration must match that of associated dynamic forward proxy cluster configuration.

## config.filter.http.dynamic_forward_proxy.v2alpha.PerRouteConfig¶

[config.filter.http.dynamic_forward_proxy.v2alpha.PerRouteConfig proto]

Per route Configuration for the dynamic forward proxy HTTP filter.

{
"host_rewrite": "...",
}

host_rewrite

(string) Indicates that before DNS lookup, the host header will be swapped with this value. If not set or empty, the original host header value will be used and no rewrite will happen.

Note: this rewrite affects both DNS lookup and host header forwarding. However, this option shouldn’t be used with HCM host rewrite given that the value set here would be used for DNS lookups whereas the value set in the HCM would be used for host header forwarding which is not the desired outcome.

Only one of host_rewrite, auto_host_rewrite_header may be set.