src/net/http/fs.go      | 1 +
 src/net/http/fs_test.go | 9 +++++++++

diff --git a/src/net/http/fs.go b/src/net/http/fs.go
index 41d46dced2a96d803ed66b797bf44778ba613f3b..ac4ed23e71c86d4894e666174ac6abdaf1270fb6 100644
--- a/src/net/http/fs.go
+++ b/src/net/http/fs.go
@@ -408,6 +408,7 @@ 			break
 		}
 		if buf[0] == ',' {
 			buf = buf[1:]
+			continue
 		}
 		if buf[0] == '*' {
 			return condFalse
diff --git a/src/net/http/fs_test.go b/src/net/http/fs_test.go
index 762e88b05ff30cf81b395a9b0a2bbc4a7dbf6bc0..f3c240fe7ebe070bac4617cbdbaca1fc19bcc54d 100644
--- a/src/net/http/fs_test.go
+++ b/src/net/http/fs_test.go
@@ -837,6 +837,15 @@ 			},
 			wantStatus:      200,
 			wantContentType: "text/css; charset=utf-8",
 		},
+		"if_none_match_malformed": {
+			file:      "testdata/style.css",
+			serveETag: `"foo"`,
+			reqHeader: map[string]string{
+				"If-None-Match": `,`,
+			},
+			wantStatus:      200,
+			wantContentType: "text/css; charset=utf-8",
+		},
 		"range_good": {
 			file:      "testdata/style.css",
 			serveETag: `"A"`,