1. chap3/sec2/file.txt - Add missing file
2. chap4/sec1/processstdin.js - process.stdin.resume() is unnecessary
3. chap4/sec5/httprequest.js - Change host to 127.0.0.1 for testing locally
4. chap4/sec5/httpserverrequestpost.js - Add debug log
5. chap5/sec1/expresspost.js - Add debug log
6. chap5/sec1/npm-debug.log b/chap5/sec1/npm-debug.log - Delete unuseful file
7. chap5/sec1/post.php - Add PHP script tags