Function remove_cache_validation_request_headers 

pub fn remove_cache_validation_request_headers(headers: &mut HeaderMap)

Remove cache validation and conditional request headers.

These headers influence conditional requests and partial responses. They are typically removed when the proxy may change representation semantics or body bytes, or when the proxy wants to force a fresh upstream response.

Call this when you rewrite, decompress, aggregate, or otherwise transform the response body, or when you want to disable conditional requests through this hop.