diff --git a/bak/encoding.cc b/bak/encoding.cc
new file mode 100644
index 0000000..fd5ebae
--- /dev/null
+++ b/bak/encoding.cc
@@ -0,0 +1 @@
+#include "webcc/encoding.h"
diff --git a/bak/encoding.h b/bak/encoding.h
new file mode 100644
index 0000000..8b3cf96
--- /dev/null
+++ b/bak/encoding.h
@@ -0,0 +1,21 @@
+#ifndef WEBCC_ENCODING_H_
+#define WEBCC_ENCODING_H_
+
+#include <string>
+#include <codecvt>
+
+namespace webcc {
+
+std::string Utf16ToUtf8(const std::wstring& utf16_string) {
+ std::wstring_convert<std::codecvt_utf8<wchar_t>> converter;
+ return converter.to_bytes(utf16_string);
+}
+
+std::wstring Utf8ToUtf16(const std::string& utf8_string) {
+ std::wstring_convert<std::codecvt_utf8<wchar_t>> converter;
+ return converter.from_bytes(utf8_string);
+}
+
+}  // namespace webcc
+
+#endif  // WEBCC_ENCODING_H_
diff --git a/bak/endpoint.cc b/bak/endpoint.cc
new file mode 100644
index 0000000..16ce664
--- /dev/null
+++ b/bak/endpoint.cc
@@ -0,0 +1,41 @@
+
+#include "boost/asio/ip/tcp.hpp"
+
+
+using Endpoint = boost::asio::ip::tcp::endpoint;
+using Endpoints = boost::asio::ip::tcp::resolver::results_type;
+
+void PrintEndpoint(std::ostream& ostream, const Endpoint& endpoint);
+
+void PrintEndpoints(std::ostream& ostream, const Endpoints& endpoints);
+
+std::string EndpointToString(const Endpoint& endpoint);
+
+
+
+using tcp = boost::asio::ip::tcp;
+
+void PrintEndpoint(std::ostream& ostream, const Endpoint& endpoint) {
+  ostream << endpoint;
+  if (endpoint.protocol() == tcp::v4()) {
+    ostream << ", v4";
+  } else if (endpoint.protocol() == tcp::v6()) {
+    ostream << ", v6";
+  }
+}
+
+void PrintEndpoints(std::ostream& ostream, const Endpoints& endpoints) {
+  ostream << "Endpoints: " << endpoints.size() << std::endl;
+  tcp::resolver::results_type::iterator it = endpoints.begin();
+  for (; it != endpoints.end(); ++it) {
+    ostream << "  - ";
+    PrintEndpoint(ostream, it->endpoint());
+    ostream << std::endl;
+  }
+}
+
+std::string EndpointToString(const Endpoint& endpoint) {
+  std::stringstream ss;
+  PrintEndpoint(ss, endpoint);
+  return ss.str();
+}
diff --git a/bak/js_encode_uri_component.js b/bak/js_encode_uri_component.js
new file mode 100644
index 0000000..aad7e5c
--- /dev/null
+++ b/bak/js_encode_uri_component.js
@@ -0,0 +1,16 @@
+function fixedEncodeURIComponent(str) {
+  return encodeURIComponent(str).replace(/[!'()*]/g, function(c) {
+    return '%' + c.charCodeAt(0).toString(16);
+  });
+}
+
+console.log(encodeURIComponent('[!\'()*]'))
+console.log(fixedEncodeURIComponent('[!\'()*]'))
+
+const subDelims = '!$&\\()*+,;=';
+console.log(encodeURIComponent(subDelims))
+console.log(fixedEncodeURIComponent(subDelims))
+
+const unreserved = 'aAzZ09-._~';
+console.log(encodeURIComponent(unreserved))
+console.log(fixedEncodeURIComponent(unreserved))
diff --git a/bak/service_manager_unittest.cc b/bak/service_manager_unittest.cc
new file mode 100644
index 0000000..e519aa3
--- /dev/null
+++ b/bak/service_manager_unittest.cc
@@ -0,0 +1,77 @@
+#include "gtest/gtest.h"
+
+#include "webcc/service_manager.h"
+
+// -----------------------------------------------------------------------------
+
+class MyService : public webcc::Service {
+public:
+  webcc::ResponsePtr Handle(webcc::RequestPtr request,
+                            const webcc::UrlArgs& args) override {
+    return webcc::ResponseBuilder{}.OK()();
+  }
+};
+
+// -----------------------------------------------------------------------------
+/*
+TEST(ServiceManagerTest, URL_RegexBasic) {
+  webcc::ServiceManager service_manager;
+
+  service_manager.Add(std::make_shared<MyService>(), "/instance/(\\d+)", true);
+
+  std::string url = "/instance/12345";
+  webcc::UrlArgs args;
+
+  webcc::ServicePtr service = service_manager.Get(url, &args);
+
+  EXPECT_TRUE(!!service);
+
+  EXPECT_EQ(1, args.size());
+  EXPECT_EQ("12345", args[0]);
+
+  url = "/instance/abcde";
+  args.clear();
+  service = service_manager.Get(url, &args);
+
+  EXPECT_FALSE(!!service);
+}
+
+TEST(RestServiceManagerTest, URL_RegexMultiple) {
+  webcc::ServiceManager service_manager;
+
+  service_manager.Add(std::make_shared<MyService>(),
+                      "/study/(\\d+)/series/(\\d+)/instance/(\\d+)", true);
+
+  std::string url = "/study/1/series/2/instance/3";
+  webcc::UrlArgs args;
+
+  webcc::ServicePtr service = service_manager.Get(url, &args);
+
+  EXPECT_TRUE(!!service);
+
+  EXPECT_EQ(3, args.size());
+  EXPECT_EQ("1", args[0]);
+  EXPECT_EQ("2", args[1]);
+  EXPECT_EQ("3", args[2]);
+
+  url = "/study/a/series/b/instance/c";
+  args.clear();
+  service = service_manager.Get(url, &args);
+
+  EXPECT_FALSE(!!service);
+}
+
+TEST(RestServiceManagerTest, URL_NonRegex) {
+  webcc::ServiceManager service_manager;
+
+  service_manager.Add(std::make_shared<MyService>(), "/instances", false);
+
+  std::string url = "/instances";
+  webcc::UrlArgs args;
+
+  webcc::ServicePtr service = service_manager.Get(url, &args);
+
+  EXPECT_TRUE(!!service);
+  EXPECT_TRUE(args.empty());
+}
+*/
\ No newline at end of file
diff --git a/bak/sleep.cpp b/bak/sleep.cpp
new file mode 100644
index 0000000..5056c5d
--- /dev/null
+++ b/bak/sleep.cpp
@@ -0,0 +1,11 @@
+static void Sleep(int seconds) {
+  if (seconds > 0) {
+    LOG_INFO("Sleep %d seconds...", seconds);
+    std::this_thread::sleep_for(std::chrono::seconds(seconds));
+  }
+}
+
+std::cout << std::endl;
+    std::cout << "If |seconds| is provided, the server will sleep, for testing "
+              << "timeout, before " << std::endl
+              << "send back each response." << std::endl;
\ No newline at end of file
diff --git a/data/README.md b/data/README.md
index 2f1ac46..6e421e8 100644
--- a/data/README.md
+++ b/data/README.md
@@ -1,2 +1,2 @@
-
-**upload**: files for testing upload.
+**upload**: files for testing upload using multipart form data. (`examples/form_client.cc`)
+**www**: doc root for testing static file server. (`examples/static_file_server.cc`)
diff --git a/data/upload/记住我.txt b/data/upload/记住我.txt
new file mode 100644
index 0000000..f563cc7
--- /dev/null
+++ b/data/upload/记住我.txt
@@ -0,0 +1,17 @@
+Remember 
+BY CHRISTINA ROSSETTI
+
+Remember me when I am gone away, 
+         Gone far away into the silent land; 
+         When you can no more hold me by the hand, 
+Nor I half turn to go yet turning stay. 
+Remember me when no more day by day 
+         You tell me of our future that you plann'd: 
+         Only remember me; you understand 
+It will be late to counsel then or pray. 
+Yet if you should forget me for a while 
+         And afterwards remember, do not grieve: 
+         For if the darkness and corruption leave 
+         A vestige of the thoughts that once I had, 
+Better by far you should forget and smile 
+         Than that you should remember and be sad.
diff --git a/data/www/deer.jpg b/data/www/deer.jpg
new file mode 100644
index 0000000..bc6ba92
Binary files /dev/null and b/data/www/deer.jpg differ
diff --git a/data/www/index.html b/data/www/index.html
new file mode 100644
index 0000000..b45ef6f
--- /dev/null
+++ b/data/www/index.html
@@ -0,0 +1 @@
+Hello, World!
\ No newline at end of file
diff --git a/webcc/url.h b/webcc/url.h
index 57032d1..fa342e3 100644
--- a/webcc/url.h
+++ b/webcc/url.h
@@ -102,6 +102,8 @@ class UrlQuery {
 public:
   using Parameter = std::pair<std::string, std::string>;
 
+  UrlQuery() = default;
+
   // The query string should be key-value pairs separated by '&'.
   explicit UrlQuery(const std::string& encoded_str);