Introduction Java’s java.net.http.HttpClient (introduced in Java 11) provides a modern and standardized way to perform HTTP requests. Enabling detailed logging for this client offers invaluable insights when troubleshooting network issues, analyzing request/response behavior, and optimizing application performance. To enable the log, add this JVM option -Djdk.httpclient.HttpClient.log=errors,requests when staring your application. Code example I use this library as a client to call OpenAI API, the library uses httpclient for making http request.