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diff --git a/dev/examples/cgi/cgi.cc b/dev/examples/cgi/cgi.cc
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+/* 
+  cgi example
+  written by Amlal El Mahrouss.
+  licensed under the MIT license
+ */
+
+#include <lib/utility/cgi.hpp>
+#include <fstream>
+#include <sstream>
+#include <string>
+
+const std::string g_not_found = R"(
+<!DOCTYPE html>
+<html>
+<head>
+  <meta charset="UTF-8">
+  <title>error | snu-lib</title>
+  <style>
+    body {
+      font-family: monospace;
+      background: white;
+      color: black;
+      margin: 2em;
+    }
+    h1 {
+      font-size: 1.5em;
+    }
+    hr {
+      border: none;
+      border-top: 1px solid #ccc;
+    }
+    table {
+      width: 100%;
+      border-collapse: collapse;
+    }
+    td {
+      padding: 0.2em 0.5em;
+    }
+    td:first-child {
+      white-space: nowrap;
+    }
+    a {
+      color: blue;
+      text-decoration: none;
+    }
+    a:hover {
+      text-decoration: underline;
+    }
+  </style>
+</head>
+<body>
+  <h1>Uh Oh!</h1>
+  <address>No index file was found in this directory.</address>
+  <hr>
+  <table>
+    <tr><th>Name</th></tr>
+    <tr><td colspan="3"><hr></td></tr>
+
+    <tr>
+      <td><a href="javascript:window.location.reload();">Refresh</a></td>
+    </tr>
+
+    <tr><td colspan="3"><hr></td></tr>
+  </table>
+  <address>snu's Common Gateway Server.</address>
+</body>
+</html>
+)";
+
+/* finally test it */
+/* @brief this stub loads a 'index.html' or returns an error message if not found. */
+int main(int argc, char** argv)
+{
+	// ... let's assume we serve data.
+
+	snu::cgi::cgi_writer writer;
+	std::stringstream	  ss_file;
+
+	std::ifstream fp("index.html");
+
+	if (fp.good())
+		ss_file << fp.rdbuf();
+	else
+		ss_file << g_not_found;
+
+	fp.close();
+
+	writer.eval_html(ss_file);
+
+	return 0;
+}