fix: remove unused field from response's header

go.mod

@@ -1,6 +1,6 @@
 module github.com/vicanso/cod-recover
 
 require (
-	github.com/vicanso/cod v0.0.2
-	github.com/vicanso/hes v0.1.3
+	github.com/vicanso/cod v0.0.6
+	github.com/vicanso/hes v0.1.4
 )

go.sum

@@ -2,7 +2,11 @@ github.com/julienschmidt/httprouter v1.2.0 h1:TDTW5Yz1mjftljbcKqRcrYhd4XeOoI98t+
 github.com/julienschmidt/httprouter v1.2.0/go.mod h1:SYymIcj16QtmaHHD7aYtjjsJG7VTCxuUUipMqKk8s4w=
 github.com/vicanso/cod v0.0.2 h1:bTGMY9Qp4R+rsgFXXSexmt3GSAcxL/zyxRhRfaSlRcQ=
 github.com/vicanso/cod v0.0.2/go.mod h1:m+avmqlCzw472clYqSNtyNNm+BO3DW9OJCek23kSUUE=
+github.com/vicanso/cod v0.0.6 h1:T5lLjAoCPPw5GnxbmqfuU7TD5pMY+JEJkOx2gvXiK90=
+github.com/vicanso/cod v0.0.6/go.mod h1:m+avmqlCzw472clYqSNtyNNm+BO3DW9OJCek23kSUUE=
 github.com/vicanso/hes v0.1.3 h1:3txPJL+J+xBRhIotkK3XKNbmBz+JXJ1knmGM0L+Qe4k=
 github.com/vicanso/hes v0.1.3/go.mod h1:bG0UJ3EihDKObFcLLwJYjxHHr9saFllsFcepyDIvFlo=
+github.com/vicanso/hes v0.1.4 h1:n8kG8krvNJF4Sj1PvZOEUzdUsmDSbCcGr8C1nYnoP+o=
+github.com/vicanso/hes v0.1.4/go.mod h1:bG0UJ3EihDKObFcLLwJYjxHHr9saFllsFcepyDIvFlo=
 github.com/vicanso/keygrip v0.1.0 h1:/zYzoVIbREAvaxSM7bo3/oSXuuYztaP71dPBfhRoNkM=
 github.com/vicanso/keygrip v0.1.0/go.mod h1:cI05iOjY00NJ7oH2Z9Zdm9eJPUkpoex3XnEubK78nho=

recover.go

@@ -41,6 +41,15 @@ func New() cod.Handler {
 					err = he
 				}
 				c.Cod(nil).EmitError(c, err)
+				// 出错时清除部分响应头
+				for _, key := range []string{
+					cod.HeaderETag,
+					cod.HeaderLastModified,
+					cod.HeaderContentEncoding,
+					cod.HeaderContentLength,
+				} {
+					c.SetHeader(key, "")
+				}
 				// 如果已直接对Response写入数据，则将 Committed设置为 true
 				c.Committed = true
 				resp := c.Response

recover_test.go

@@ -18,6 +18,15 @@ func TestRecover(t *testing.T) {
 	})
 	req := httptest.NewRequest("GET", "https://aslant.site/", nil)
 	resp := httptest.NewRecorder()
+	keys := []string{
+		cod.HeaderETag,
+		cod.HeaderLastModified,
+		cod.HeaderContentEncoding,
+		cod.HeaderContentLength,
+	}
+	for _, key := range keys {
+		resp.Header().Set(key, "a")
+	}
 
 	catchError := false
 	d.OnError(func(_ *cod.Context, _ error) {
@@ -31,4 +40,9 @@ func TestRecover(t *testing.T) {
 		!catchError {
 		t.Fatalf("recover fail")
 	}
+	for _, key := range keys {
+		if resp.Header().Get(key) != "" {
+			t.Fatalf("reset response header fail")
+		}
+	}
 }