Added access log to server and modified mock-fts to use it

internal/middleware/logging.go

@@ -120,9 +120,11 @@ func isRequestIDChar(char byte) bool {
 	return char == '-' || char == '_' || char == '.'
 }
 
-// Logger logs one line per request. The query string is deliberately not
-// logged, as it may carry secrets. It logs to slog.Default() unless given
-// WithLogger.
+// Logger logs one line per request: at debug level, or at info level for a
+// connection hijack (a WebSocket upgrade), as one is logged per connection
+// rather than per request; a 4xx response is logged at warn level and a 5xx
+// at error level. The query string is deliberately not logged, as it may
+// carry secrets. It logs to slog.Default() unless given WithLogger.
 func Logger(opts ...Option) func(http.Handler) http.Handler {
 	settings := applyOptions(opts)
 	return func(next http.Handler) http.Handler {
@@ -138,12 +140,14 @@ func Logger(opts ...Option) func(http.Handler) http.Handler {
 					status = http.StatusOK
 				}
 
-				level := slog.LevelInfo
+				level := slog.LevelDebug
 				switch {
 				case status >= 500:
 					level = slog.LevelError
 				case status >= 400:
 					level = slog.LevelWarn
+				case recorder.hijacked:
+					level = slog.LevelInfo
 				}
 
 				settings.logger("http").LogAttrs(