added HTTP Date header

datetime.h

@@ -0,0 +1,77 @@
+#pragma once
+
+#include <string>
+#include <boost/date_time/local_time/local_time.hpp>
+#include <boost/filesystem.hpp>
+
+namespace flask
+{
+    // code from http://stackoverflow.com/questions/2838524/use-boost-date-time-to-parse-and-create-http-dates
+    class DateTime
+    {
+        public:
+            DateTime()
+                : m_dt(boost::local_time::local_sec_clock::local_time(boost::local_time::time_zone_ptr()))
+            {
+            }
+            DateTime(const std::string& path)
+                : DateTime()
+            {
+                from_file(path);
+            }
+
+            // return datetime string
+            std::string str()
+            {
+                std::string result;
+                boost::local_time::local_time_facet* lf(new boost::local_time::local_time_facet("%a, %d %b %Y %H:%M:%S GMT"));
+                try
+                {
+                    std::stringstream ss;
+                    ss.imbue(std::locale(ss.getloc(), lf));
+                    ss << m_dt;
+                    result = ss.str();
+                }
+                catch (std::exception& e)
+                {
+                    std::cerr << "Exception: " << e.what() << std::endl;
+                }
+                return result;
+            }
+
+            // update datetime from file mod date
+            std::string from_file(const std::string& path)
+            {
+                try
+                {
+                    boost::filesystem::path p(path);
+                    boost::posix_time::ptime pt = boost::posix_time::from_time_t(
+                            boost::filesystem::last_write_time(p));
+                    m_dt = boost::local_time::local_date_time(pt, boost::local_time::time_zone_ptr());
+                }
+                catch (std::exception& e)
+                {
+                    std::cout << "Exception: " << e.what() << std::endl;
+                }
+                return str();
+            }
+
+            // parse datetime string
+            void parse(const std::string& dt)
+            {
+                boost::local_time::local_time_input_facet* lif(new boost::local_time::local_time_input_facet("%a, %d %b %Y %H:%M:%S GMT"));
+                std::stringstream ss(dt);
+                ss.imbue(std::locale(std::locale::classic(), lif));
+                ss >> m_dt;
+            }
+
+            // boolean equal operator
+            friend bool operator==(const DateTime& left, const DateTime& right)
+            {
+                return (left.m_dt == right.m_dt);
+            }
+
+        private:
+            boost::local_time::local_date_time m_dt;
+    };
+}

http_connection.h

@@ -9,6 +9,7 @@
 
 #include "parser.h"
 #include "http_response.h"
+#include "datetime.h"
 
 namespace flask
 {
@@ -112,6 +113,12 @@ namespace flask
             }
             if (!has_date)
             {
+                std::string date_str = DateTime().str();
+                auto ret = res.headers.emplace("Date", date_str);
+                buffers_.emplace_back(ret.first->first.data(), ret.first->first.size());
+                buffers_.emplace_back(seperator.data(), seperator.size());
+                buffers_.emplace_back(ret.first->second.data(), ret.first->second.size());
+                buffers_.emplace_back(crlf.data(), crlf.size());
             }
 
             buffers_.emplace_back(crlf.data(), crlf.size());