Avoid checking date header of web requests by properly applying generic handlers (#2914)

vendor/github.com/urfave/negroni/logger.go

@@ -0,0 +1,35 @@
+package negroni
+
+import (
+	"log"
+	"net/http"
+	"os"
+	"time"
+)
+
+// ALogger interface
+type ALogger interface {
+	Println(v ...interface{})
+	Printf(format string, v ...interface{})
+}
+
+// Logger is a middleware handler that logs the request as it goes in and the response as it goes out.
+type Logger struct {
+	// ALogger implements just enough log.Logger interface to be compatible with other implementations
+	ALogger
+}
+
+// NewLogger returns a new Logger instance
+func NewLogger() *Logger {
+	return &Logger{log.New(os.Stdout, "[negroni] ", 0)}
+}
+
+func (l *Logger) ServeHTTP(rw http.ResponseWriter, r *http.Request, next http.HandlerFunc) {
+	start := time.Now()
+	l.Printf("Started %s %s", r.Method, r.URL.Path)
+
+	next(rw, r)
+
+	res := rw.(ResponseWriter)
+	l.Printf("Completed %v %s in %v", res.Status(), http.StatusText(res.Status()), time.Since(start))
+}