Reorganize folder structure.

example/http_hello_async_client/CMakeLists.txt

@@ -0,0 +1,4 @@
+add_executable(http_hello_async_client main.cc)
+
+target_link_libraries(http_hello_async_client webcc ${Boost_LIBRARIES})
+target_link_libraries(http_hello_async_client "${CMAKE_THREAD_LIBS_INIT}")

example/http_hello_async_client/main.cc

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+#include <iostream>
+
+#include "boost/asio/io_context.hpp"
+
+#include "webcc/logger.h"
+#include "webcc/async_http_client.h"
+
+// In order to test this client, create a file index.html whose content is
+// simply "Hello, World!", then start a HTTP server with Python 3:
+//     $ python -m http.server
+// The default port number should be 8000.
+
+void Test(boost::asio::io_context& ioc) {
+  std::shared_ptr<webcc::HttpRequest> request(new webcc::HttpRequest());
+
+  request->set_method(webcc::kHttpGet);
+  request->set_url("/index.html");
+  request->SetHost("localhost", "8000");
+
+  request->Build();
+
+  webcc::HttpAsyncClientPtr client(new webcc::AsyncHttpClient(ioc));
+
+  // Response handler.
+  auto handler = [](std::shared_ptr<webcc::HttpResponse> response,
+                    webcc::Error error,
+                    bool timed_out) {
+    if (error == webcc::kNoError) {
+      std::cout << response->content() << std::endl;
+    } else {
+      std::cout << webcc::DescribeError(error);
+      if (timed_out) {
+        std::cout << " (timed out)";
+      }
+      std::cout << std::endl;
+    }
+  };
+
+  client->Request(request, handler);
+}
+
+int main() {
+  WEBCC_LOG_INIT("", webcc::LOG_CONSOLE);
+
+  boost::asio::io_context ioc;
+
+  Test(ioc);
+  Test(ioc);
+  Test(ioc);
+
+  ioc.run();
+
+  return 0;
+}