return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		tc, ok := r.Context().Value(mcontext.ContextTraceKey).(*mcontext.TraceCtxt)

		// Reject unsupported reserved metadata first before validation.
		if containsReservedMetadata(r.Header) {
			if ok {
				tc.FuncName = "handler.ValidRequest"
				tc.ResponseRecorder.LogErrBody = true
			}

    }

    public void test_updateConfiguration() {
        assertNotNull(systemHelper.updateConfiguration());
        systemHelper.addUpdateConfigListener("XXX", () -> "OK");
        assertTrue(systemHelper.updateConfiguration().contains("XXX: OK"));
    }

    public void test_isChangedClusterState() {
        systemHelper.isChangedClusterState(0);
        assertFalse(systemHelper.isChangedClusterState(0));

        try {
            client.execute(RequestDataBuilder.newRequestData().get().url(url).build());
            fail();
        } catch (final MultipleCrawlingAccessException e) {
            // ok
            final Throwable[] causes = e.getCauses();
            assertEquals(5, causes.length);
        }
        assertEquals(1, testListener.startCount);
        assertEquals(5, testListener.requestCount);

		}
		w.buffer[offset] = make([]byte, len(b))
		copy(w.buffer[offset], b)
		n = len(b)
	}

again:
	nextOut, ok := w.buffer[w.nextOffset]
	if ok {
		n, err = w.w.Write(nextOut)
		delete(w.buffer, w.nextOffset)
		w.nextOffset += int64(n)
		if n != len(nextOut) {
			return 0, fmt.Errorf("expected write size %d but wrote %d bytes", len(nextOut), n)

		builder.WriteQuoted(currentTable)
	} else {
		builder.WriteQuoted(update.Table)
	}
}

// MergeClause merge update clause
func (update Update) MergeClause(clause *Clause) {
	if v, ok := clause.Expression.(Update); ok {
		if update.Modifier == "" {
			update.Modifier = v.Modifier
		}
		if update.Table.Name == "" {
			update.Table = v.Table
		}
	}
	clause.Expression = update

		}
		if kdf, ok := test.metadata[crypto.MetaAlgorithm]; !ok {
			t.Errorf("Test %d: ServerSideEncryptionKDF must be part of metadata: %v", i, kdf)
		}
		if iv, ok := test.metadata[crypto.MetaIV]; !ok {
			t.Errorf("Test %d: crypto.SSEIV must be part of metadata: %v", i, iv)
		}
		if mac, ok := test.metadata[crypto.MetaSealedKeySSEC]; !ok {

// FromContentMD5 decodes and returns the Content-MD5
// as ETag, if set. If no Content-MD5 header is set
// it returns an empty ETag and no error.
func FromContentMD5(h http.Header) (ETag, error) {
	v, ok := h["Content-Md5"]
	if !ok {
		return nil, nil
	}
	if v[0] == "" {
		return nil, errors.New("etag: content-md5 is set but contains no value")
	}
	b, err := base64.StdEncoding.Strict().DecodeString(v[0])
	if err != nil {

		if _, ok := bucketMap[bucket]; !ok {
			err = objectAPI.MakeBucket(ctx, bucket, MakeBucketOptions{
				ForceCreate: true, // ignore if it already exists
			})
			if err != nil {
				rpt.SetStatus(bucket, "", err)
				continue
			}
			v, _ := globalBucketMetadataSys.Get(bucket)
			bucketMap[bucket] = &v
		}
		if _, ok := bucketMap[bucket]; !ok {
			continue
		}
		switch fileName {

				if exp[k] != got[k] {
					t.Fatalf("interval %s: Expected %d values but got %d values\n", k, exp[k], got[k])
				}
			}
			// what is absent in exp is absent in got too
			for k := range got {
				if _, ok := exp[k]; !ok && got[k] > 0 {
					t.Fatalf("Unexpected interval: %s has value %d\n", k, got[k])
				}
			}
		})
	}
}

func TestMigrateSizeHistogramFromV1(t *testing.T) {
	tests := []struct {
		v    sizeHistogramV1

	j.MetaSys[metaTierObjName] = []byte("obj-1")
	if _, ok := j.InitFreeVersion(fi); !ok {
		t.Fatal("Expected a free version to be created")
	}

	// Test if we skip creating a free version if SkipTier was set on fi
	fi.SetSkipTierFreeVersion()
	if _, ok := j.InitFreeVersion(fi); ok {
		t.Fatal("Expected no free version to be created")
	}