From a20443c285dabdec8d2ee740500c62e31ad90c7b Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Thu, 23 Apr 2015 12:43:52 +0200
Subject: Implement apache service

---
 brep/module            |  27 +++---
 brep/module.cxx        | 144 ++++++++++++++++++++++++++++---
 brep/search.cxx        |  31 +++++--
 brep/view              |  20 +++++
 brep/view.cxx          |  15 ++++
 etc/apachectl          | 170 ++++++++++++++++++++++++++++++++++++
 etc/httpd.conf         |  61 +++++++++++++
 services.cxx           |   8 +-
 web/apache/log         |  50 +++++++++--
 web/apache/request     | 228 +++++++++++++++++++++++++++++++++++++++++++++++++
 web/apache/request.cxx | 186 ++++++++++++++++++++++++++++++++++++++++
 web/apache/request.ixx | 218 ++++++++++++++++++++++++++++++++++++++++++++++
 web/apache/service     |  94 +++++++++++++++++++-
 web/apache/stream      | 161 ++++++++++++++++++++++++++++++++++
 web/module             |  66 ++++++++++++--
 www/htdocs/index.html  |   5 ++
 16 files changed, 1428 insertions(+), 56 deletions(-)
 create mode 100644 brep/view
 create mode 100644 brep/view.cxx
 create mode 100755 etc/apachectl
 create mode 100644 etc/httpd.conf
 create mode 100644 web/apache/request
 create mode 100644 web/apache/request.cxx
 create mode 100644 web/apache/request.ixx
 create mode 100644 web/apache/stream
 create mode 100644 www/htdocs/index.html

diff --git a/brep/module b/brep/module
index 3f7b409..d976559 100644
--- a/brep/module
+++ b/brep/module
@@ -5,7 +5,9 @@
 #ifndef BREP_MODULE
 #define BREP_MODULE
 
+#include <string>
 #include <utility> // move()
+#include <cstdint>
 
 #include <web/module>
 
@@ -20,28 +22,14 @@ namespace brep
   //    web::module and our module. Or maybe not, need to try.
   //
   using web::status_code;
+  using web::invalid_request;
+  using web::sequence_error;
   using web::name_value;
   using web::name_values;
   using web::request;
   using web::response;
   using web::log;
 
-  // This exception is used to signal that the request is invalid
-  // (4XX codes) rather than that it could not be processed (5XX).
-  // By default 422 is returned, which means the request was
-  // semantically invalid.
-  //
-  struct invalid_request
-  {
-    status_code status {422};
-    std::string description;
-
-    //@@ Maybe optional "try again" link?
-    //
-    invalid_request (std::string d, status_code s = 422)
-        : status (s), description (std::move (d)) {}
-  };
-
   // And this exception indicated a server error (5XX). In particular,
   // it is thrown by the fail diagnostics stream and is caught by the
   // module implementation where it is both logged as an error and
@@ -105,6 +93,7 @@ namespace brep
     //
   protected:
     module ();
+    module (const module& );
 
     virtual void
     handle (request&, response&, log&);
@@ -114,6 +103,12 @@ namespace brep
   private:
     log* log_ {nullptr}; // Diagnostics backend provided by the web server.
 
+    // Extract function name from a __PRETTY_FUNCTION__.
+    // Throw std::invalid_argument if fail to parse.
+    //
+    static std::string
+    func_name (const std::string& pretty_name);
+
     void
     log_write (diag_data&&) const;
 
diff --git a/brep/module.cxx b/brep/module.cxx
index 15e996f..17790de 100644
--- a/brep/module.cxx
+++ b/brep/module.cxx
@@ -4,7 +4,16 @@
 
 #include <brep/module>
 
+#include <stdexcept>
+#include <string>
 #include <functional> // bind()
+#include <cstring>    // strncmp()
+
+#include <httpd/httpd.h>
+
+#include <web/module>
+
+#include <web/apache/log>
 
 using namespace std;
 using namespace placeholders; // For std::bind's _1, etc.
@@ -15,6 +24,7 @@ namespace brep
   handle (request& rq, response& rs, log& l)
   {
     log_ = &l;
+    const basic_mark error (severity::error, log_writer_, __PRETTY_FUNCTION__);
 
     try
     {
@@ -22,39 +32,151 @@ namespace brep
     }
     catch (const invalid_request& e)
     {
-      // @@ Both log and format as HTML in proper style, etc.
-      //
-      rs.content (e.status, "text/html;charset=utf-8") << e.description;
+      if (e.description.empty ())
+      {
+        rs.status (e.status);
+      }
+      else
+      {
+        try
+        {
+          rs.content (e.status, "text/html;charset=utf-8") << e.description;
+        }
+        catch (const sequence_error& se)
+        {
+          error << se.what ();
+          rs.status (e.status);
+        }
+      }
     }
     catch (server_error& e) // Non-const because of move() below.
     {
-      // @@ Both log and return as 505.
-      //
       log_write (move (e.data));
+      rs.status (HTTP_INTERNAL_SERVER_ERROR);
     }
     catch (const exception& e)
     {
-      // @@ Exception: log e.what () & 505.
-      //
-      rs.status (505);
+      error << e.what ();
+      rs.status (HTTP_INTERNAL_SERVER_ERROR);
     }
     catch (...)
     {
-      // @@ Unknown exception: log & 505.
-      //
-      rs.status (505);
+      error << "unknown error";
+      rs.status (HTTP_INTERNAL_SERVER_ERROR);
     }
   }
 
   module::
   module (): log_writer_ (bind (&module::log_write, this, _1)) {}
 
+  // Custom copy constructor is required to initialize log_writer_ properly.
+  //
+  module::
+  module (const module& m): module ()  {verb_ = m.verb_;}
+
+// For function func declared like this:
+// using B = std::string (*)(int);
+// using A = B (*)(int,int);
+// A func(B (*)(char),B (*)(wchar_t));
+// __PRETTY_FUNCTION__ looks like this:
+// virtual std::string (* (* brep::search::func(std::string (* (*)(char))(int)\
+// ,std::string (* (*)(wchar_t))(int)) const)(int, int))(int)
+//
+  string module::
+  func_name (const string& pretty_name)
+  {
+    string::size_type b (0);
+    string::size_type e (pretty_name.find (' '));
+
+    // Position b at beginning of supposed function name,
+    //
+    if (e != string::npos && !strncmp (pretty_name.c_str (), "virtual ", 8))
+    {
+      // Skip keyword virtual.
+      //
+      b = pretty_name.find_first_not_of (' ', e);
+      e = pretty_name.find (' ', b);
+    }
+
+    if (pretty_name.find ('(', b) > e)
+    {
+      // Not a constructor nor destructor. Skip type or *.
+      //
+      b = pretty_name.find_first_not_of (' ', e);
+    }
+
+    if (b != string::npos)
+    {
+      // Position e at the last character of supposed function name.
+      //
+      e = pretty_name.find_last_of (')');
+
+      if (e != string::npos && e > b)
+      {
+        size_t d (1);
+
+        while (--e > b && d)
+        {
+          switch (pretty_name[e])
+          {
+          case ')': ++d; break;
+          case '(': --d; break;
+          }
+        }
+
+        if (!d)
+        {
+          return pretty_name[b] == '(' && pretty_name[e] == ')' ?
+            // Not a name yet, go deeper.
+            //
+            func_name (string(pretty_name, b + 1, e - b - 1)) :
+            // Got the name.
+            //
+            string (pretty_name, b, e - b + 1);
+        }
+      }
+    }
+
+    throw invalid_argument ("");
+  }
+
   void module::
   log_write (diag_data&& d) const
   {
     if (log_ == nullptr)
       return; // No backend yet.
 
+    auto al = dynamic_cast<::web::apache::log*> (log_);
+
+    if (al)
+    {
+      // Considered using lambda for mapping but looks too verbose while can
+      // be a bit safer in runtime.
+      //
+      static int s[] = { APLOG_ERR, APLOG_WARNING, APLOG_INFO, APLOG_TRACE1 };
+
+      for (const auto& e : d)
+      {
+        string name;
+
+        try
+        {
+          name = func_name (e.name);
+        }
+        catch (const invalid_argument&)
+        {
+          // Log "pretty" function description, see in log file & fix.
+          name = e.name;
+        }
+
+        al->write (e.loc.file.c_str(),
+                   e.loc.line,
+                   name.c_str(),
+                   s[static_cast<int> (e.sev)],
+                   e.msg.c_str());
+      }
+    }
+
     //@@ Cast log_ to apache::log and write the records.
     //
 
diff --git a/brep/search.cxx b/brep/search.cxx
index 683016c..93690e4 100644
--- a/brep/search.cxx
+++ b/brep/search.cxx
@@ -5,6 +5,10 @@
 #include <brep/search>
 
 #include <ostream>
+#include <iostream>
+#include <chrono>
+
+#include <web/module>
 
 using namespace std;
 
@@ -15,26 +19,39 @@ namespace brep
   {
     MODULE_DIAG;
 
+    chrono::seconds ma (60);
+    rs.cookie ("Oh", " Ah\n\n", &ma, "/");
+    rs.cookie ("Hm", ";Yes", &ma);
+
+    info << "handling search request from "; // << rq.client_ip ();
+
+    ostream& o (rs.content (200, "text/html;charset=utf-8", false));
+
+    o << "<html><head></head><body><b>Params:</b>";
+
     const name_values& ps (rq.parameters ());
 
     if (ps.empty ())
-      throw invalid_request ("search parameters expected");
+      throw invalid_request (422, "search parameters expected");
 
     if (ps.size () > 100)
       fail << "too many parameters: " << ps.size () <<
         info << "are you crazy to specify so many?";
 
-    info << "handling search request from "; // << rq.client_ip ();
-
     level2 ([&]{trace << "search request with " << ps.size () << " params";});
 
-    ostream& o (rs.content (202, "text/html;charset=utf-8"));
+    for (const auto& p: ps)
+    {
+      o << "<br>\n" << p.name << "=" << p.value;
+    }
 
-    o << "Search page:" << endl;
+    o << "<br>\n<b>Cookies:</b>";
 
-    for (const name_value& p: ps)
+    for (const auto& c : rq.cookies ())
     {
-      o << p.name << "=" << p.value << endl;
+      o << "<br>\n" << c.name << "=" << c.value << " ";
     }
+
+    o << "</body></html>";
   }
 }
diff --git a/brep/view b/brep/view
new file mode 100644
index 0000000..819eff3
--- /dev/null
+++ b/brep/view
@@ -0,0 +1,20 @@
+// file      : brep/view -*- C++ -*-
+// copyright : Copyright (c) 2014-2015 Code Synthesis Tools CC
+// license   : MIT; see accompanying LICENSE file
+
+#ifndef BREP_VIEW
+#define BREP_VIEW
+
+#include <brep/module>
+
+namespace brep
+{
+  class view: public module
+  {
+  public:
+    virtual void
+    handle (request&, response&);
+  };
+}
+
+#endif // BREP_VIEW
diff --git a/brep/view.cxx b/brep/view.cxx
new file mode 100644
index 0000000..6dafa1b
--- /dev/null
+++ b/brep/view.cxx
@@ -0,0 +1,15 @@
+// file      : brep/view.cxx -*- C++ -*-
+// copyright : Copyright (c) 2014-2015 Code Synthesis Tools CC
+// license   : MIT; see accompanying LICENSE file
+
+#include <brep/view>
+
+using namespace std;
+
+namespace brep
+{
+  void view::
+  handle (request& rq, response& rs)
+  {
+  }
+}
diff --git a/etc/apachectl b/etc/apachectl
new file mode 100755
index 0000000..d9c1ee9
--- /dev/null
+++ b/etc/apachectl
@@ -0,0 +1,170 @@
+#!/bin/sh
+#
+# Copyright (c) 2000-2002 The Apache Software Foundation.
+# See license at the end of this file.
+#
+# Apache control script designed to allow an easy command line interface
+# to controlling Apache.  Written by Marc Slemko, 1997/08/23
+#
+# The exit codes returned are:
+#   XXX this doc is no longer correct now that the interesting
+#   XXX functions are handled by httpd
+#	0 - operation completed successfully
+#	1 -
+#	2 - usage error
+#	3 - httpd could not be started
+#	4 - httpd could not be stopped
+#	5 - httpd could not be started during a restart
+#	6 - httpd could not be restarted during a restart
+#	7 - httpd could not be restarted during a graceful restart
+#	8 - configuration syntax error
+#
+# When multiple arguments are given, only the error from the _last_
+# one is reported.  Run "apachectl help" for usage info
+
+ARGV="$@"
+#
+# |||||||||||||||||||| START CONFIGURATION SECTION  ||||||||||||||||||||
+# --------------------                              --------------------
+
+PORT=7180
+LOG_LEVEL=trace1
+ADMIN_EMAIL=admin@cppget.org
+
+# |||||||||||||||||||| END CONFIGURATION SECTION |||||||||||||||||||||||
+
+PROJECT_DIR=$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )/..
+
+site_config="$PROJECT_DIR/etc"
+workspace="$PROJECT_DIR/var"
+www="$PROJECT_DIR/www"
+
+mkdir -p "$workspace"
+
+# the path to your httpd binary, including options if necessary
+
+HTTPD="/usr/sbin/httpd -d $workspace -f $site_config/httpd.conf"
+
+# a command that outputs a formatted text version of the HTML at the
+# url given on the command line.  Designed for lynx, however other
+# programs may work.
+LYNX="lynx -dump"
+
+# the URL to your server's mod_status status page.  If you do not
+# have one, then status and fullstatus will not work.
+STATUSURL="http://localhost:$PORT/server-status"
+
+# Set this variable to a command that increases the maximum
+# number of file descriptors allowed per child process. This is
+# critical for configurations that use many file descriptors,
+# such as mass vhosting, or a multithreaded server.
+ULIMIT_MAX_FILES="ulimit -S -n `ulimit -H -n`"
+# --------------------                              --------------------
+# ||||||||||||||||||||   END CONFIGURATION SECTION  ||||||||||||||||||||
+
+# Set the maximum number of file descriptors allowed per child process.
+if [ "x$ULIMIT_MAX_FILES" != "x" ] ; then
+    $ULIMIT_MAX_FILES
+fi
+
+ERROR=0
+if [ "x$ARGV" = "x" ] ; then
+    ARGV="-h"
+fi
+
+case $ARGV in
+start)
+    $HTTPD -C "Listen $PORT" -C "ServerName cppget.org:$PORT" \
+           -C "DocumentRoot $www/htdocs" -C "CoreDumpDirectory $workspace" \
+           -C "PidFile $workspace/httpd.pid" \
+           -C "LogLevel $LOG_LEVEL" \
+           -C "LoadModule search_srv $PROJECT_DIR/libbrep.so" \
+           -C "LoadModule view_srv $PROJECT_DIR/libbrep.so" \
+           -C "ServerAdmin $ADMIN_EMAIL" \
+           -k $ARGV
+
+    ERROR=$?
+    ;;
+stop|restart|graceful)
+    $HTTPD -C "ServerName cppget.org:$PORT" \
+           -C "PidFile $workspace/httpd.pid" -k $ARGV
+    ERROR=$?
+    ;;
+startssl|sslstart|start-SSL)
+    $HTTPD -k start -DSSL
+    ERROR=$?
+    ;;
+configtest)
+    $HTTPD -t
+    ERROR=$?
+    ;;
+status)
+    $LYNX $STATUSURL | awk ' /process$/ { print; exit } { print } '
+    ;;
+fullstatus)
+    $LYNX $STATUSURL
+    ;;
+*)
+    $HTTPD $ARGV
+    ERROR=$?
+esac
+
+exit $ERROR
+
+# ====================================================================
+# The Apache Software License, Version 1.1
+#
+# Copyright (c) 2000-2003 The Apache Software Foundation.  All rights
+# reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions
+# are met:
+#
+# 1. Redistributions of source code must retain the above copyright
+#    notice, this list of conditions and the following disclaimer.
+#
+# 2. Redistributions in binary form must reproduce the above copyright
+#    notice, this list of conditions and the following disclaimer in
+#    the documentation and/or other materials provided with the
+#    distribution.
+#
+# 3. The end-user documentation included with the redistribution,
+#    if any, must include the following acknowledgment:
+#       "This product includes software developed by the
+#        Apache Software Foundation (http://www.apache.org/)."
+#    Alternately, this acknowledgment may appear in the software itself,
+#    if and wherever such third-party acknowledgments normally appear.
+#
+# 4. The names "Apache" and "Apache Software Foundation" must
+#    not be used to endorse or promote products derived from this
+#    software without prior written permission. For written
+#    permission, please contact apache@apache.org.
+#
+# 5. Products derived from this software may not be called "Apache",
+#    nor may "Apache" appear in their name, without prior written
+#    permission of the Apache Software Foundation.
+#
+# THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
+# WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+# DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
+# ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
+# USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+# ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+# OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
+# OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+# SUCH DAMAGE.
+# ====================================================================
+#
+# This software consists of voluntary contributions made by many
+# individuals on behalf of the Apache Software Foundation.  For more
+# information on the Apache Software Foundation, please see
+# <http://www.apache.org/>.
+#
+# Portions of this software are based upon public domain software
+# originally written at the National Center for Supercomputing Applications,
+# University of Illinois, Urbana-Champaign.
+#
diff --git a/etc/httpd.conf b/etc/httpd.conf
new file mode 100644
index 0000000..95b887d
--- /dev/null
+++ b/etc/httpd.conf
@@ -0,0 +1,61 @@
+User apache
+Group apache
+
+ErrorLog error_log
+#ErrorLog "|/usr/sbin/rotatelogs /Users/karen/projects/brep/var/error_log.%Y%m%d 86400"
+
+ErrorLogFormat "[%t] [%l] [%m] %M"
+
+Timeout 60
+
+KeepAlive On
+KeepAliveTimeout 3
+
+ThreadLimit        1000
+ServerLimit           2
+StartServers          1
+MaxClients         1000
+MinSpareThreads     400
+MaxSpareThreads     600
+ThreadsPerChild     500
+MaxRequestsPerChild   0
+
+LoadModule mpm_worker_module /usr/lib64/httpd/modules/mod_mpm_worker.so
+LoadModule unixd_module /usr/lib64/httpd/modules/mod_unixd.so
+LoadModule filter_module /usr/lib64/httpd/modules/mod_filter.so
+LoadModule access_compat_module /usr/lib64/httpd/modules/mod_access_compat.so
+LoadModule authn_core_module /usr/lib64/httpd/modules/mod_authn_core.so
+LoadModule authz_core_module /usr/lib64/httpd/modules/mod_authz_core.so
+LoadModule status_module /usr/lib64/httpd/modules/mod_status.so
+LoadModule mime_module /usr/lib64/httpd/modules/mod_mime.so
+LoadModule deflate_module /usr/lib64/httpd/modules/mod_deflate.so
+LoadModule authz_host_module /usr/lib64/httpd/modules/mod_authz_host.so
+LoadModule expires_module /usr/lib64/httpd/modules/mod_expires.so
+LoadModule dir_module /usr/lib64/httpd/modules/mod_dir.so
+
+TypesConfig /etc/mime.types
+
+<LocationMatch ^/search$>
+  SetHandler search
+</LocationMatch>
+
+<LocationMatch ^/view$>
+  SetHandler view
+</LocationMatch>
+
+DirectoryIndex index.html
+
+ExtendedStatus On
+
+<Location /server-status>
+  SetHandler server-status
+  Order deny,allow
+  Deny from all
+  Allow from 127.0.0
+  Allow from localhost
+</Location>
+
+<Directory />
+  Options FollowSymLinks
+  AllowOverride None
+</Directory>
diff --git a/services.cxx b/services.cxx
index 2345114..2da5bca 100644
--- a/services.cxx
+++ b/services.cxx
@@ -5,13 +5,13 @@
 #include <web/apache/service>
 
 #include <brep/search>
-//#include <brep/view>
+#include <brep/view>
 
 using namespace brep;
 using web::apache::service;
 
 static const search search_mod;
-service /*AP_MODULE_DECLARE_DATA*/ search_srv ("search", search_mod);
+service AP_MODULE_DECLARE_DATA search_srv ("search", search_mod);
 
-//static const view view_mod;
-//service AP_MODULE_DECLARE_DATA view_srv ("view", view_mod);
+static const view view_mod;
+service AP_MODULE_DECLARE_DATA view_srv ("view", view_mod);
diff --git a/web/apache/log b/web/apache/log
index 0e39420..151efb4 100644
--- a/web/apache/log
+++ b/web/apache/log
@@ -5,7 +5,11 @@
 #ifndef WEB_APACHE_LOG
 #define WEB_APACHE_LOG
 
-#include <cstdint> // uint64_t
+#include <algorithm> // min()
+#include <cstdint>   // uint64_t
+
+#include <httpd/httpd.h>    // request_rec
+#include <httpd/http_log.h>
 
 #include <web/module>
 
@@ -16,7 +20,8 @@ namespace web
     class log: public web::log
     {
     public:
-      // ...
+
+      log (request_rec* req) noexcept : req_ (req) {}
 
       virtual void
       write (const char* msg) {write (APLOG_ERR, msg);}
@@ -24,13 +29,48 @@ namespace web
       // Apache-specific interface.
       //
       void
-      write (int level, const char* msg) {write (nullptr, 0, level, msg);}
+      write (int level, const char* msg)
+      {
+        write (nullptr, 0, nullptr, level, msg);
+      }
 
       void
-      write (const char* file, std::uint64_t line, int level, const char* msg);
+      write (const char* file,
+             std::uint64_t line,
+             const char* func,
+             int level,
+             const char* msg)
+      {
+        if (file && *file)
+          file = nullptr; // skip file/line placeholder from log line.
+
+        level = std::min (level, APLOG_TRACE8);
+
+        if (func)
+          ap_log_rerror (file,
+                         line,
+                         APLOG_NO_MODULE,
+                         level,
+                         0,
+                         req_,
+                         "[%s]: %s",
+                         func,
+                         msg);
+        else
+          // skip function name placeholder from log line
+          //
+          ap_log_rerror (file,
+                         line,
+                         APLOG_NO_MODULE,
+                         level,
+                         0,
+                         req_,
+                         ": %s",
+                         msg);
+      }
 
     private:
-     // ...
+      request_rec* req_;
     };
   }
 }
diff --git a/web/apache/request b/web/apache/request
new file mode 100644
index 0000000..ab5c765
--- /dev/null
+++ b/web/apache/request
@@ -0,0 +1,228 @@
+// file      : web/apache/request -*- C++ -*-
+// copyright : Copyright (c) 2014-2015 Code Synthesis Tools CC
+// license   : MIT; see accompanying LICENSE file
+
+#ifndef WEB_APACHE_REQUEST
+#define WEB_APACHE_REQUEST
+
+#include <stdexcept>
+#include <exception>
+#include <string>
+#include <ios>
+#include <istream>
+#include <ostream>
+#include <streambuf>
+#include <memory>    // unique_ptr
+#include <algorithm> // move
+#include <chrono>
+#include <cassert>
+
+#include <apr_strings.h>
+
+#include <httpd/httpd.h>
+#include <httpd/http_core.h>
+#include <httpd/util_script.h>
+
+#include <web/module>
+#include <web/apache/stream>
+
+namespace web
+{
+  namespace apache
+  {
+    class request : public web::request, public web::response
+    {
+      friend class service;
+
+      request (request_rec* rec) noexcept: rec_ (rec) {}
+
+      // Flush of buffered content.
+      //
+      int
+      flush ();
+
+      // Get request body data stream.
+      //
+      virtual std::istream&
+      data ()
+      {
+        if (write_flag ())
+        {
+          throw sequence_error ("::web::apache::request::data");
+        }
+
+        if (!in_)
+        {
+          std::unique_ptr<std::streambuf> in_buf (new istreambuf (rec_));
+          in_.reset (new std::istream (in_buf.get ()));
+          in_buf_ = std::move (in_buf);
+          in_->exceptions (std::ios::failbit | std::ios::badbit);
+
+          // Save form data now otherwise will not be available to do later
+          // when data read from stream.
+          //
+          form_data ();
+        }
+
+        return *in_;
+      }
+
+      // Get request parameters.
+      //
+      virtual const name_values&
+      parameters ()
+      {
+        if (!parameters_)
+        {
+          parameters_.reset (new name_values());
+
+          try
+          {
+            parse_parameters(rec_->args);
+            parse_parameters(form_data ()->c_str ());
+          }
+          catch(const std::invalid_argument& )
+          {
+            throw invalid_request();
+          }
+        }
+
+        return *parameters_;
+      }
+
+      // Get request cookies.
+      //
+      virtual const name_values&
+      cookies ();
+
+      // Get response status code.
+      //
+      status_code status () const noexcept {return status_;}
+
+      // Set response status code.
+      //
+      virtual void
+      status (status_code status)
+      {
+        if (status != status_)
+        {
+          // Setting status code in exception handler is a common usecase
+          // where no sense to throw but still need to signal apache a
+          // proper status code.
+          //
+          if (write_flag () && !std::current_exception ())
+          {
+            throw sequence_error ("::web::apache::request::status");
+          }
+
+          status_ = status;
+          type_.clear ();
+          buffer_ = true;
+          out_.reset ();
+          out_buf_.reset ();
+          set_content_type ();
+        }
+      }
+
+      // Set response status code, content type and get body stream.
+      //
+      virtual std::ostream&
+      content (status_code status,
+               const std::string& type,
+               bool buffer = true);
+
+      // Add response cookie.
+      //
+      virtual void
+      cookie (const char* name,
+              const char* value,
+              const std::chrono::seconds* max_age = 0,
+              const char* path = 0,
+              const char* domain = 0,
+              bool secure = false);
+
+    private:
+      using string_ptr = std::unique_ptr<std::string>;
+
+      // Get application/x-www-form-urlencoded form data.
+      //
+      const string_ptr&
+      form_data ();
+
+      void
+      parse_parameters (const char* args);
+
+      static void
+      mime_url_encode (const char* v, std::ostream& o);
+
+      static std::string
+      mime_url_decode (const char* b, const char* e, bool trim = false);
+
+      // Save content type to apache internals.
+      //
+      void
+      set_content_type () const noexcept
+      {
+        if (type_.empty ())
+          ap_set_content_type (rec_, nullptr);
+        else
+        {
+          if(status_ == HTTP_OK)
+          {
+            ap_set_content_type (rec_,
+                                 apr_pstrdup (rec_->pool, type_.c_str ()));
+          }
+          else
+          {
+            // Unfortunatelly there is no way to set a proper content type
+            // for error custom response. Depending on presense of
+            // "suppress-error-charset" key in request_rec::subprocess_env
+            // table content type is set to "text/html" otherwise to
+            // "text/html; charset=iso-8859-1" (read http_protocol.c for
+            // details). I have chosen the first one as it is better not to
+            // specify charset than to set a wrong one. Ensure to put
+            // a proper encoding to
+            // <meta http-equiv="Content-Type" content="text/html;charset=...">
+            // tag so browser can render the page properly.
+            // The clean solution would be patching apache but let's leave this
+            // troublesome option untill really required.
+            //
+            apr_table_set (rec_->subprocess_env, "suppress-error-charset", "");
+          }
+        }
+      }
+
+      bool
+      write_flag () const noexcept
+      {
+        if (!buffer_)
+        {
+          assert (out_buf_);
+          auto b = dynamic_cast<ostreambuf*> (out_buf_.get ());
+          assert (b);
+          return b->write_flag ();
+        }
+
+        return false;
+      }
+
+    private:
+
+      request_rec* rec_;
+      status_code status_ {HTTP_OK};
+      std::string type_;
+      bool buffer_ {true};
+      std::unique_ptr<std::streambuf> out_buf_;
+      std::unique_ptr<std::ostream> out_;
+      std::unique_ptr<std::streambuf> in_buf_;
+      std::unique_ptr<std::istream> in_;
+      std::unique_ptr<name_values> parameters_;
+      std::unique_ptr<name_values> cookies_;
+      string_ptr form_data_;
+    };
+  }
+}
+
+#include <web/apache/request.ixx>
+
+#endif // WEB_APACHE_REQUEST
diff --git a/web/apache/request.cxx b/web/apache/request.cxx
new file mode 100644
index 0000000..6f043bc
--- /dev/null
+++ b/web/apache/request.cxx
@@ -0,0 +1,186 @@
+// file      : web/apache/request.cxx -*- C++ -*-
+// copyright : Copyright (c) 2014-2015 Code Synthesis Tools CC
+// license   : MIT; see accompanying LICENSE file
+
+#include <web/apache/request>
+
+#include <stdexcept>
+#include <ios>
+#include <streambuf>
+#include <sstream>
+#include <ostream>
+#include <memory>    // unique_ptr
+#include <algorithm> // move()
+#include <chrono>
+#include <ctime>
+
+#include <strings.h> // strcasecmp()
+
+#include <apr_tables.h>
+
+using namespace std;
+
+namespace web
+{
+  namespace apache
+  {
+    const name_values& request::
+    cookies ()
+    {
+      if (!cookies_)
+      {
+        cookies_.reset (new name_values ());
+
+        const apr_array_header_t* ha = apr_table_elts (rec_->headers_in);
+        size_t n = ha->nelts;
+
+        for (auto h (reinterpret_cast<const apr_table_entry_t *> (ha->elts));
+             n--; ++h)
+        {
+          if (!::strcasecmp (h->key, "Cookie"))
+          {
+            for (const char* n (h->val); n != 0; )
+            {
+              const char* v = strchr (n, '=');
+              const char* e = strchr (n, ';');
+
+              if (e && e < v)
+                v = 0;
+
+              string name (
+                v ? mime_url_decode (n, v, true) :
+                (e ? mime_url_decode (n, e, true) :
+                 mime_url_decode (n, n + strlen (n), true)));
+
+              string value;
+
+              if (v++)
+              {
+                value = e ? mime_url_decode (v, e, true) :
+                  mime_url_decode (v, v + strlen (v), true);
+              }
+
+              if (!name.empty () || !value.empty ())
+                cookies_->emplace_back (move (name), move (value));
+
+              n = e ? e + 1 : 0;
+            }
+          }
+        }
+      }
+
+      return *cookies_;
+    }
+
+    ostream& request::
+    content (status_code status, const std::string& type, bool buffer)
+    {
+      if (type.empty ())
+      {
+        // Getting content stream for writing assumes type to be provided.
+        //
+        throw std::invalid_argument (
+          "::web::apache::request::content invalid type");
+      }
+
+      // Due to apache implementation of error custom response there is no
+      // way to make it unbuffered.
+      //
+      buffer = buffer || status != HTTP_OK;
+
+      if ((status != status_ || type != type_ || buffer != buffer_) &
+          write_flag ())
+      {
+        throw sequence_error ("::web::apache::request::content");
+      }
+
+      if (status == status_ && type == type_ && buffer == buffer_)
+      {
+        assert (out_);
+        return *out_;
+      }
+
+      if (!buffer)
+        // Request body will be discarded prior first byte of content is
+        // written. Save form data now to make it available for furture
+        // parameters () call.
+        //
+        form_data ();
+
+      std::unique_ptr<std::streambuf> out_buf(
+        buffer ? static_cast<std::streambuf*> (new std::stringbuf ()) :
+        static_cast<std::streambuf*> (new ostreambuf (rec_)));
+
+      out_.reset (new std::ostream (out_buf.get ()));
+
+      out_buf_ = std::move (out_buf);
+
+      out_->exceptions (
+        std::ios::eofbit | std::ios::failbit | std::ios::badbit);
+
+      status_ = status;
+      type_ = type;
+      buffer_ = buffer;
+
+      if (!buffer_)
+        set_content_type ();
+
+      return *out_;
+    }
+
+    void request::
+    cookie (const char* name,
+            const char* value,
+            const std::chrono::seconds* max_age,
+            const char* path,
+            const char* domain,
+            bool secure)
+    {
+      if (write_flag ())
+      {
+        throw sequence_error ("::web::apache::request::cookie");
+      }
+
+      std::ostringstream s;
+      mime_url_encode (name, s);
+      s << "=";
+      mime_url_encode (value, s);
+
+      if (max_age)
+      {
+        std::chrono::system_clock::time_point tp =
+          std::chrono::system_clock::now () + *max_age;
+
+        std::time_t t = std::chrono::system_clock::to_time_t (tp);
+
+        // Assume global "C" locale is not changed.
+        //
+        char b[100];
+        std::strftime (b,
+                       sizeof (b),
+                       "%a, %d-%b-%Y %H:%M:%S GMT",
+                       std::gmtime (&t));
+
+        s << "; Expires=" << b;
+      }
+
+      if (path)
+      {
+        s << ";Path=" << path;
+      }
+
+      if (domain)
+      {
+        s << ";Domain=" << domain;
+      }
+
+      if (secure)
+      {
+        s << ";Secure";
+      }
+
+      apr_table_add (rec_->err_headers_out, "Set-Cookie", s.str ().c_str ());
+    }
+
+  }
+}
diff --git a/web/apache/request.ixx b/web/apache/request.ixx
new file mode 100644
index 0000000..a427fd4
--- /dev/null
+++ b/web/apache/request.ixx
@@ -0,0 +1,218 @@
+// file      : web/apache/request.ixx -*- C++ -*-
+// copyright : Copyright (c) 2014-2015 Code Synthesis Tools CC
+// license   : MIT; see accompanying LICENSE file
+
+#include <iomanip>
+#include <sstream>
+#include <cstring>
+#include <cstdlib>
+
+#include <strings.h> // strcasecmp()
+
+namespace web
+{
+  namespace apache
+  {
+    inline int request::
+    flush ()
+    {
+      if (buffer_ && out_buf_)
+      {
+        set_content_type ();
+
+        auto b = dynamic_cast<std::stringbuf*> (out_buf_.get ());
+        assert(b);
+
+        std::string s (b->str ());
+
+        if (!s.empty ())
+        {
+          // Before writing response read and discard request body if any.
+          //
+          int r = ap_discard_request_body (rec_);
+
+          if (r == OK)
+          {
+            if (status_ == HTTP_OK)
+            {
+              if (ap_rwrite (s.c_str (), s.length (), rec_) < 0)
+              {
+                status_ = HTTP_REQUEST_TIME_OUT;
+              }
+            }
+            else
+            {
+              ap_custom_response (rec_, status_, s.c_str ());
+            }
+          }
+          else
+            status_ = r;
+        }
+
+        out_.reset ();
+        out_buf_.reset ();
+      }
+
+      return status_ == HTTP_OK ? OK : status_;
+    }
+
+    inline const request::string_ptr& request::
+    form_data ()
+    {
+      if (!form_data_)
+      {
+        form_data_.reset (new std::string ());
+        const char *ct = apr_table_get (rec_->headers_in, "Content-Type");
+
+        if (ct && !strncasecmp ("application/x-www-form-urlencoded", ct, 33))
+        {
+          std::istream& istr (data ());
+          std::getline (istr, *form_data_);
+
+          // Make request data still be available.
+          //
+
+          std::unique_ptr<std::streambuf> in_buf (
+            new std::stringbuf (*form_data_));
+
+          in_.reset (new std::istream (in_buf.get ()));
+          in_buf_ = std::move (in_buf);
+          in_->exceptions (std::ios::failbit | std::ios::badbit);
+        }
+      }
+
+      return form_data_;
+    }
+
+    inline void request::
+    parse_parameters (const char* args)
+    {
+      for (auto n (args); n != 0; )
+      {
+        const char* v = strchr (n, '=');
+        const char* e = strchr (n, '&');
+
+        if (e && e < v)
+          v = 0;
+
+        std::string name (v
+                          ? mime_url_decode (n, v) :
+                          (e
+                           ? mime_url_decode (n, e)
+                           : mime_url_decode (n, n + std::strlen (n))));
+
+        std::string value;
+
+        if (v++)
+        {
+          value = e
+            ? mime_url_decode (v, e)
+            : mime_url_decode (v, v + std::strlen (v));
+        }
+
+        if (!name.empty () || !value.empty ())
+          parameters_->emplace_back (std::move (name), std::move (value));
+
+        n = e ? e + 1 : 0;
+      }
+    }
+
+    inline void request::
+    mime_url_encode (const char* v, std::ostream& o)
+    {
+      char f = o.fill ();
+      std::ios_base::fmtflags g = o.flags ();
+      o << std::hex << std::uppercase << std::right << std::setfill ('0');
+      char c;
+
+      while ((c = *v++) != '\0')
+      {
+        if ((c >= 'A' && c <= 'Z') || (c >= 'a' && c <= 'z') ||
+            (c >= '0' && c <= '9'))
+        {
+          o << c;
+        }
+        else
+          switch (c)
+          {
+          case ' ': o << '+'; break;
+          case '.':
+          case '_':
+          case '-':
+          case '~': o << c; break;
+          default: o << "%" << std::setw (2) << (unsigned short)c;
+          }
+      }
+
+      o.flags (g);
+      o.fill (f);
+    }
+
+    inline std::string request::
+    mime_url_decode (const char* b, const char* e, bool trim)
+    {
+      if (trim)
+      {
+        b += std::strspn (b, " ");
+
+        if (b >= e)
+          return std::string();
+
+        while (*--e == ' ');
+        ++e;
+      }
+
+      std::string value;
+      value.reserve (e - b);
+
+      char bf[3];
+      bf[2] = '\0';
+
+      while (b != e)
+      {
+        char c = *b++;
+
+        switch (c)
+        {
+        case '+':
+          {
+            value.append (" ");
+            break;
+          }
+        case '%':
+          {
+            if (*b == '\0' || b[1] == '\0')
+            {
+              throw std::invalid_argument (
+                "::web::apache::request::mime_url_decode short");
+            }
+
+            *bf = *b;
+            bf[1] = b[1];
+
+            char* ebf = 0;
+            size_t vl = std::strtoul (bf, &ebf, 16);
+
+            if (*ebf != '\0')
+            {
+              throw std::invalid_argument (
+                "::web::apache::request::mime_url_decode wrong");
+            }
+
+            value.append (1, (char)vl);
+            b += 2;
+            break;
+          }
+        default:
+          {
+            value.append (1, c);
+            break;
+          }
+        }
+      }
+
+      return value;
+    }
+
+  }
+}
diff --git a/web/apache/service b/web/apache/service
index 8dd21d8..688f8f1 100644
--- a/web/apache/service
+++ b/web/apache/service
@@ -5,22 +5,106 @@
 #ifndef WEB_APACHE_SERVICE
 #define WEB_APACHE_SERVICE
 
+#include <exception>
 #include <string>
+#include <cassert>
+
+#include <httpd/httpd.h>
+#include <httpd/http_config.h>
 
 #include <web/module>
 
+#include <web/apache/log>
+#include <web/apache/request>
+
 namespace web
 {
   namespace apache
   {
-    class service
+    class service : ::module
     {
     public:
       // Note that the module exemplar is stored by-reference.
       //
       template <typename M>
       service (const std::string& name, const M& exemplar)
-          : exemplar_ (exemplar), handle_ (&handle_impl<M>) {}
+          : ::module
+            {
+              STANDARD20_MODULE_STUFF,
+              nullptr,
+              nullptr,
+              nullptr,
+              nullptr,
+              nullptr,
+              &register_hooks<M>
+            },
+            name_ (name),
+            exemplar_ (exemplar)
+
+// Doesn't look like handle_ member is required at all.
+//          handle_ (&handle_impl<M>)
+      {
+        // instance<M> () invented to delegate processing from apache request
+        // handler C function to service non static member function.
+        // This appoach resticts number of service objects per module
+        // implementation class with just one instance.
+        //
+        service*& srv = instance<M> ();
+        assert (srv == nullptr);
+        srv = this;
+      }
+
+      template <typename M>
+      static service*&
+      instance () noexcept
+      {
+        static service* instance;
+        return instance;
+      }
+
+      template <typename M>
+      static void
+      register_hooks (apr_pool_t *pool) noexcept
+      {
+        ap_hook_handler (&request_handler<M>, NULL, NULL, APR_HOOK_LAST);
+      }
+
+      template <typename M>
+      static int
+      request_handler (request_rec* r) noexcept
+      {
+        auto srv = instance<M> ();
+
+        if (!r->handler || srv->name_ != r->handler)
+          return DECLINED;
+
+        request req (r);
+        log l(r);
+
+        // As soons as M (), handle () and flush () can throw need to handle
+        // exceptions here.
+        //
+        try
+        {
+          M m (static_cast<const M&> (srv->exemplar_));
+          static_cast<module&> (m).handle (req, req, l);
+          return req.flush();
+        }
+        catch (const std::exception& e)
+        {
+          l.write (nullptr, 0, __PRETTY_FUNCTION__, APLOG_ERR, e.what ());
+        }
+        catch (...)
+        {
+          l.write (nullptr,
+                   0,
+                   __PRETTY_FUNCTION__,
+                   APLOG_ERR,
+                   "unknown error");
+        }
+
+        return HTTP_INTERNAL_SERVER_ERROR;
+      }
 
       //@@ Implementation calls handle_ function pointer below:
       //
@@ -28,6 +112,7 @@ namespace web
       //
 
     private:
+/*
       template <typename M>
       static void
       handle_impl (request& rq, response& rs, log& l, const module& exemplar)
@@ -35,9 +120,10 @@ namespace web
         M m (static_cast<const M&> (exemplar));
         static_cast<module&> (m).handle (rq, rs, l);
       }
-
+*/
+      std::string name_;
       const module& exemplar_;
-      void (*handle_) (request&, response&, log&, const module&);
+//      void (*handle_) (request&, response&, log&, const module&);
     };
   }
 }
diff --git a/web/apache/stream b/web/apache/stream
new file mode 100644
index 0000000..eb62b85
--- /dev/null
+++ b/web/apache/stream
@@ -0,0 +1,161 @@
+// file      : web/apache/stream -*- C++ -*-
+// copyright : Copyright (c) 2014-2015 Code Synthesis Tools CC
+// license   : MIT; see accompanying LICENSE file
+
+#ifndef WEB_APACHE_STREAM
+#define WEB_APACHE_STREAM
+
+#include <streambuf>
+#include <ios>       // streamsize
+#include <algorithm> // min(), max()
+#include <cstring>   // memmove()
+#include <memory>    // unique_ptr
+
+#include <httpd/httpd.h>
+#include <httpd/http_protocol.h>
+
+#include <web/module>
+
+namespace web
+{
+  namespace apache
+  {
+    class ostreambuf : public std::streambuf
+    {
+    public:
+      ostreambuf (request_rec* rec) : rec_ (rec) {}
+
+      bool
+      write_flag () const noexcept {return write_;}
+
+    private:
+      virtual int_type
+      overflow (int_type c)
+      {
+        if (c != traits_type::eof ())
+        {
+          flag_write ();
+
+          char chr = c;
+
+          // Throwing allows to distinguish comm failure from other IO error
+          // conditions.
+          //
+          if (ap_rwrite (&chr, sizeof (chr), rec_) == -1)
+            throw invalid_request (HTTP_REQUEST_TIME_OUT);
+        }
+
+        return c;
+      }
+
+      virtual std::streamsize
+      xsputn (const char* s, std::streamsize num)
+      {
+        flag_write ();
+
+        if (ap_rwrite (s, num, rec_) < 0)
+        {
+          throw invalid_request (HTTP_REQUEST_TIME_OUT);
+        }
+
+        return num;
+      }
+
+      virtual int
+      sync ()
+      {
+        if(ap_rflush (rec_) < 0)
+        {
+          throw invalid_request (HTTP_REQUEST_TIME_OUT);
+        }
+
+        return 0;
+      }
+
+      void
+      flag_write () noexcept
+      {
+        if (!write_)
+        {
+          // Preparing to write a response read and discard request
+          // body if any.
+          //
+          int r = ap_discard_request_body (rec_);
+
+          if (r != OK)
+          {
+            throw invalid_request (r);
+          }
+
+          write_ = true;
+        }
+      }
+
+    private:
+
+      request_rec* rec_;
+      bool write_ {false};
+    };
+
+    class istreambuf : public std::streambuf
+    {
+    public:
+      istreambuf (request_rec* rec, size_t bufsize = 1024, size_t putback = 1)
+          : rec_ (rec),
+            bufsize_ (std::max (bufsize, (size_t)1)),
+            putback_ (std::min (putback, bufsize_ - 1)),
+            buf_ (new char[bufsize_])
+      {
+        char* p = buf_.get () + putback_;
+        setg (p, p, p);
+
+        int status = ap_setup_client_block (rec_, REQUEST_CHUNKED_DECHUNK);
+
+        if (status != OK)
+        {
+          throw invalid_request (status);
+        }
+      }
+
+    private:
+      virtual int_type
+      underflow ()
+      {
+        if (gptr () < egptr ())
+          return traits_type::to_int_type (*gptr ());
+
+        size_t pb = std::min ((size_t)(gptr () - eback ()), putback_);
+        std::memmove (buf_.get () + putback_ - pb, gptr () - pb, pb);
+
+        char* p = buf_.get () + putback_;
+        int rb = ap_get_client_block (rec_, p, bufsize_ - putback_);
+
+        if (rb == 0)
+        {
+          return traits_type::eof ();
+        }
+
+        if (rb < 0)
+        {
+          throw invalid_request (HTTP_REQUEST_TIME_OUT);
+        }
+
+        setg (p - pb, p, p + rb);
+        return traits_type::to_int_type (*gptr ());
+      }
+
+      bool error () const noexcept {return error_;}
+
+    private:
+
+      request_rec* rec_;
+      size_t bufsize_;
+      size_t putback_;
+      std::unique_ptr<char[]> buf_;
+      bool error_ {false};
+    };
+
+  }
+}
+
+#endif // WEB_APACHE_STREAM
diff --git a/web/module b/web/module
index 642b1bd..9f1c778 100644
--- a/web/module
+++ b/web/module
@@ -5,27 +5,49 @@
 #ifndef WEB_MODULE
 #define WEB_MODULE
 
+#include <utility>   // move()
+#include <stdexcept> // runtime_error
 #include <string>
 #include <vector>
 #include <iosfwd>
+#include <chrono>
 #include <cstdint>   // uint16_t
-#include <utility>   // move()
-#include <stdexcept> // runtime_error
 
 namespace web
 {
-  // Exception indicating HTTP request/response sequencing error.
-  // For example, trying to change the status code after some
-  // content has already been written.
-  //
-  struct sequence_error: std::runtime_error {};
-
   // HTTP status code.
   //
   // @@ Define some commonly used constants?
   //
   using status_code = std::uint16_t;
 
+  // This exception is used to signal that the request is invalid
+  // (4XX codes) rather than that it could not be processed (5XX).
+  // By default 400 is returned, which means the request is malformed.
+  // Non empty description of a caught by the module implementation exception
+  // can be sent to client in http response body with
+  // Content-Type:text/html;charset=utf-8 header.
+  //
+  struct invalid_request
+  {
+    status_code status;
+    std::string description;
+
+    //@@ Maybe optional "try again" link?
+    //
+    invalid_request (status_code s = 400, std::string d = "")
+        : status (s), description (std::move (d)) {}
+  };
+
+  // Exception indicating HTTP request/response sequencing error.
+  // For example, trying to change the status code after some
+  // content has already been written.
+  //
+  struct sequence_error: std::runtime_error
+  {
+    sequence_error (std::string d) : std::runtime_error (d) {}
+  };
+
   struct name_value
   {
     // These should eventually become string_view's.
@@ -48,8 +70,21 @@ namespace web
     //   in name_values.
     //@@ Maybe parameter_list() and parameter_map()?
     //
+    // Throw invalid_request if mime url decode of name or value fail.
+    //
     virtual const name_values&
     parameters () = 0;
+
+    // Throw invalid_request if Cookie header is malformed.
+    //
+    virtual const name_values&
+    cookies () = 0;
+
+    // Get stream to read request body data.
+    // Throw sequence_error if some unbuffered content is already written.
+    //
+    virtual std::istream&
+    data () = 0;
   };
 
   class response
@@ -75,9 +110,22 @@ namespace web
     content (status_code, const std::string& type, bool buffer = true) = 0;
 
     // Set status code without writing any content.
+    // On status change discards buffered output and throw sequence_error
+    // if output were not buffered.
     //
     virtual void
     status (status_code) = 0;
+
+    // Throw sequence_error if some unbuffered content is already written as
+    // will not be able to send Set-Cookie header.
+    //
+    virtual void
+    cookie (const char* name,
+            const char* value,
+            const std::chrono::seconds* max_age = 0,
+            const char* path = 0,
+            const char* domain = 0,
+            bool secure = false) = 0;
   };
 
   // A web server logging backend. The module can use it to log
@@ -91,7 +139,7 @@ namespace web
   {
   public:
     virtual void
-    write (const char* msg);
+    write (const char* msg) = 0;
   };
 
   // The web server creates a new module instance for each request
diff --git a/www/htdocs/index.html b/www/htdocs/index.html
new file mode 100644
index 0000000..3d6d51e
--- /dev/null
+++ b/www/htdocs/index.html
@@ -0,0 +1,5 @@
+<html>
+  <body>
+    <b>Home Page</b>
+  </body>
+</html>
-- 
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