request.removeHeaders(HTTP.CONTENT_LEN);
request.removeHeaders(HTTP.TRANSFER_ENCODING);
request.removeHeaders(HTTP.CONN_DIRECTIVE);
request.removeHeaders("Keep-Alive");
request.removeHeaders("Proxy-Authenticate");
request.removeHeaders("Proxy-Authorization");
request.removeHeaders("TE");
request.removeHeaders("Trailers");
request.removeHeaders("Upgrade");
// Remove host header
request.removeHeaders(HTTP.TARGET_HOST);