--- a/fastcgi_request_buffering.t
+++ b/fastcgi_request_buffering.t
@@ -241,6 +241,8 @@ EOF
 
 		$client = $server->accept();
 
+		log2c("(new connection $client)");
+
 		alarm(0);
 	};
 	alarm(0);
@@ -250,6 +252,8 @@ EOF
 	}
 
 	$client->sysread(my $buf, 1024);
+	log2i($buf);
+
 	$body = '';
 
 	while (my $h = fastcgi_read_record(\$buf)) {
@@ -271,8 +275,12 @@ EOF
 			local $SIG{PIPE} = sub { die "sigpipe\n" };
 			alarm(5);
 
+			log_out($buf);
 			$s->write($buf);
+
 			$client->sysread($buf, 1024);
+			log2i($buf);
+
 			$body = '';
 
 			while (my $h = fastcgi_read_record(\$buf)) {
@@ -312,6 +320,7 @@ EOF
 			alarm(5);
 
 			$s->sysread($buf, 1024);
+			log_in($buf);
 
 			alarm(0);
 		};
@@ -326,6 +335,10 @@ EOF
 	return $f;
 }
 
+sub log2i { Test::Nginx::log_core('|| <<', @_); }
+sub log2o { Test::Nginx::log_core('|| >>', @_); }
+sub log2c { Test::Nginx::log_core('||', @_); }
+
 ###############################################################################
 
 sub fastcgi_daemon {