Can Envoy rewrite http body?

[ChArLie zl]

Hi I am new to envoy, and I am trying to use envoy to convert a /ping request to a regular http request, which means, for the /ping request its URI is /ping, when envoy receives it, envoy will need to rewrite its URI, Header and content/body.

I found Envoy can rewrite its header, link. But I couldn't find whether envoy can rewrite its body, I was wondering if envoy support that?

Thanks