Add README. Process X-Forwarded-For

main.go

@@ -6,6 +6,7 @@ import (
 	"net"
 	"net/http"
 	"os"
+	"strings"
 	"time"
 
 	"github.com/lmittmann/tint"
@@ -41,6 +42,16 @@ func WithLogging(h http.Handler) http.Handler {
 	loggingFn := func(w http.ResponseWriter, r *http.Request) {
 		start := time.Now()
 
+		remoteAddr := r.RemoteAddr
+		fwdAddress := r.Header.Get("X-Forwarded-For")
+		if fwdAddress != "" {
+			remoteAddr = fwdAddress
+			ips := strings.Split(fwdAddress, ", ")
+			if len(ips) > 1 {
+				remoteAddr = ips[0]
+			}
+		}
+
 		responseData := &responseData{
 			status: 0,
 			size:   0,
@@ -53,11 +64,14 @@ func WithLogging(h http.Handler) http.Handler {
 
 		duration := time.Since(start)
 
-		slog.Info("Request:",
+		// t=2023-10-27T18:08:47.231895532+13:00 remote_addr=100.114.208.117 time_ms=4 duration=4.914291ms
+		slog.Info("Request Completed:",
 			slog.String("method", r.Method),
 			slog.String("path", r.RequestURI),
 			slog.String("url", r.URL.Path),
 			slog.String("host", r.Host),
+			slog.String("referer", r.Referer()),
+			slog.String("remote_addr", remoteAddr),
 			slog.Int("status", responseData.status),
 			slog.Int64("duration", duration.Microseconds()),
 			slog.Int("size", responseData.size),