fix(expand): fix missing server url

openapi/parser/expand.go

@@ -159,6 +159,7 @@ func (e *expander) Server(s openapi.Server) (expanded ogen.Server, err error) {
 			Description: param.Description,
 		}
 	}
+	expanded.URL = template.String()
 	if len(vars) > 0 {
 		expanded.Variables = vars
 	}

openapi/parser/parse_server_test.go

@@ -0,0 +1,57 @@
+package parser_test
+
+import (
+	"testing"
+
+	"github.com/ogen-go/ogen"
+	"github.com/ogen-go/ogen/openapi/parser"
+	"github.com/stretchr/testify/require"
+)
+
+func TestServerURL(t *testing.T) {
+	data := `
+info:
+  description: test
+  title: test
+  version: 1.0.0
+openapi: "3.0.0"
+servers:
+  - url: "{protocol}://{host}:{port}"
+    variables:
+      host:
+        default: localhost
+      port:
+        default: "4000"
+      protocol:
+        default: http
+        enum:
+          - http
+          - https
+`
+	spec, err := ogen.Parse([]byte(data))
+	require.NoError(t, err)
+
+	api, err := parser.Parse(spec, parser.Settings{})
+	require.NoError(t, err)
+
+	expandSpec, err := parser.Expand(api)
+	require.NoError(t, err)
+
+	require.Equal(t, []ogen.Server{
+		{
+			URL: "{protocol}://{host}:{port}",
+			Variables: map[string]ogen.ServerVariable{
+				"host": {
+					Default: "localhost",
+				},
+				"protocol": {
+					Enum:    []string{"http", "https"},
+					Default: "http",
+				},
+				"port": {
+					Default: "4000",
+				},
+			},
+		},
+	}, expandSpec.Servers)
+}