diff --git a/scanner/scanner.go b/scanner/scanner.go
index 8da8123..db711a6 100644
--- a/scanner/scanner.go
+++ b/scanner/scanner.go
@@ -940,6 +940,10 @@ func (s *Scanner) scanMapDelim(ctx *Context) (bool, error) {
 	if s.startedFlowMapNum <= 0 && nc != ' ' && nc != '\t' && !s.isNewLineChar(nc) && !ctx.isNextEOS() {
 		return false, nil
 	}
+	if s.startedFlowMapNum > 0 && nc == '/' {
+		// like http://
+		return false, nil
+	}
 
 	if strings.HasPrefix(strings.TrimPrefix(string(ctx.obuf), " "), "\t") && !strings.HasPrefix(string(ctx.buf), "\t") {
 		invalidTk := token.Invalid("tab character cannot use as a map key directly", string(ctx.obuf), s.pos())
diff --git a/yaml_test_suite_test.go b/yaml_test_suite_test.go
index 187b39f..73cb459 100644
--- a/yaml_test_suite_test.go
+++ b/yaml_test_suite_test.go
@@ -51,7 +51,6 @@ var failureTestNames = []string{
 	"nested-implicit-complex-keys",                   // no json.
 	"node-anchor-not-indented",                       // pass yamlv3.
 	"plain-dashes-in-flow-sequence",
-	"plain-url-in-flow-mapping",                             // pass yamlv3.
 	"question-mark-edge-cases/00",                           // no json.
 	"question-mark-edge-cases/01",                           // no json.
 	"scalar-value-with-two-anchors",                         // pass yamlv3.