The Envoy access_log documentation has an example with REQ(X-ENVOY-ORIGINAL-PATH?:PATH) for logging the request's path, but both the :PATH and X-ENVOY-ORIGINAL-PATH header contain the query string..

This project is a simulation of a search engine which outputs the path of the documents based on the search string query input. The program has been adapted on Romanian text and deals with diacritics ...