diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index b58b646..01f0307 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -14,6 +14,7 @@ add_executable(${PROJECT_NAME}
 	envy.cpp
 	cgi_env.cpp
 	num_to_token.cpp
+	cgi_post.cpp
 )
 
 target_include_directories(${PROJECT_NAME} SYSTEM
diff --git a/src/cgi_post.cpp b/src/cgi_post.cpp
new file mode 100644
index 0000000..56f93b4
--- /dev/null
+++ b/src/cgi_post.cpp
@@ -0,0 +1,45 @@
+#include "cgi_post.hpp"
+#include "cgi_env.hpp"
+#include "split_get_vars.hpp"
+#include <iostream>
+#include <iterator>
+#include <algorithm>
+#include <string>
+#include <cassert>
+#include <ciso646>
+
+namespace tawashi {
+	namespace cgi {
+		namespace {
+		} //unnamed namespace
+
+		const PostMapType& read_post (const CGIEnv& parEnv) {
+			static bool already_read = false;
+			static PostMapType map;
+			static std::string original_data;
+
+			if (not already_read) {
+				assert(original_data.empty());
+				assert(map.empty());
+
+				const auto input_len = parEnv.content_length();
+				if (input_len > 0) {
+					original_data.reserve(input_len);
+					std::copy_n(
+						std::istream_iterator<char>(std::cin),
+						input_len,
+						std::back_inserter(original_data)
+					);
+
+					for (auto& itm : split_env_vars(original_data)) {
+						map[itm.first] = itm.second;
+					}
+				}
+
+				already_read = true;
+			}
+
+			return map;
+		}
+	} //namespace cgi
+} //namespace tawashi
diff --git a/src/cgi_post.hpp b/src/cgi_post.hpp
new file mode 100644
index 0000000..b7ebeec
--- /dev/null
+++ b/src/cgi_post.hpp
@@ -0,0 +1,14 @@
+#pragma once
+
+#include <boost/container/flat_map.hpp>
+#include <boost/utility/string_ref.hpp>
+
+namespace tawashi {
+	class CGIEnv;
+
+	namespace cgi {
+		typedef boost::container::flat_map<boost::string_ref, boost::string_ref> PostMapType;
+
+		const PostMapType& read_post (const CGIEnv& parEnv);
+	} //namespace cgi
+} //namespace tawashi