fix: consistent replies for incorrect range requests on replicated buckets (#14345)

Propagate error from replication proxy target correctly to the client if range GET is unsatisfiable.

cmd/httprange_test.go

@@ -101,3 +101,46 @@ func TestHTTPRequestRangeSpec(t *testing.T) {
 		t.Errorf("Case %d: Expected errInvalidRange but: %v %v %d %d %v", i, rs, err1, o, l, err2)
 	}
 }
+
+func TestHTTPRequestRangeToHeader(t *testing.T) {
+	validRangeSpecs := []struct {
+		spec        string
+		errExpected bool
+	}{
+		{"bytes=0-", false},
+		{"bytes=1-", false},
+
+		{"bytes=0-9", false},
+		{"bytes=1-10", false},
+		{"bytes=1-1", false},
+		{"bytes=2-5", false},
+
+		{"bytes=-5", false},
+		{"bytes=-1", false},
+		{"bytes=-1000", false},
+		{"bytes=", true},
+		{"bytes= ", true},
+		{"byte=", true},
+		{"bytes=A-B", true},
+		{"bytes=1-B", true},
+		{"bytes=B-1", true},
+		{"bytes=-1-1", true},
+	}
+	for i, testCase := range validRangeSpecs {
+		rs, err := parseRequestRangeSpec(testCase.spec)
+		if err != nil {
+			if !testCase.errExpected || err == nil && testCase.errExpected {
+				t.Errorf("unexpected err: %v", err)
+			}
+			continue
+		}
+		h, err := rs.ToHeader()
+		if err != nil && !testCase.errExpected || err == nil && testCase.errExpected {
+			t.Errorf("expected error with invalid range: %v", err)
+		}
+		if h != testCase.spec {
+			t.Errorf("Case %d: translated to incorrect header: %s expected: %s",
+				i, h, testCase.spec)
+		}
+	}
+}