diff --git a/samplecode/mio/README.md b/samplecode/mio/README.md
new file mode 100644
index 000000000..e557d454a
--- /dev/null
+++ b/samplecode/mio/README.md
@@ -0,0 +1,31 @@
+## Run
+
+Start server
+
+```
+cd server
+make
+cd bin
+./app
+```
+
+Start client 
+
+```
+cd client
+cargo run
+```
+
+Start client-go (golang should be installed)
+```
+cd client-go
+make
+./bin/app
+```
+
+Start client-java (Java:1.8+, mvn)
+```
+cd client-java
+mvn install
+java -jar target/client-java-0.0.1-SNAPSHOT.jar
+```
diff --git a/samplecode/mio/client-go/.gitignore b/samplecode/mio/client-go/.gitignore
new file mode 100644
index 000000000..0c4370d5d
--- /dev/null
+++ b/samplecode/mio/client-go/.gitignore
@@ -0,0 +1,8 @@
+### IntelliJ IDEA ###
+.idea
+*.iws
+*.iml
+*.ipr
+
+### VS Code ###
+.vscode/
diff --git a/samplecode/mio/client-go/Makefile b/samplecode/mio/client-go/Makefile
new file mode 100644
index 000000000..713a4718b
--- /dev/null
+++ b/samplecode/mio/client-go/Makefile
@@ -0,0 +1,5 @@
+default: build
+
+build:
+	go build -o bin/app main.go
+
diff --git a/samplecode/mio/client-go/ca.cert b/samplecode/mio/client-go/ca.cert
new file mode 100644
index 000000000..a18fb02cf
--- /dev/null
+++ b/samplecode/mio/client-go/ca.cert
@@ -0,0 +1,51 @@
+-----BEGIN CERTIFICATE-----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+-----END CERTIFICATE-----
diff --git a/samplecode/mio/client-go/main.go b/samplecode/mio/client-go/main.go
new file mode 100644
index 000000000..7c1c8e26d
--- /dev/null
+++ b/samplecode/mio/client-go/main.go
@@ -0,0 +1,46 @@
+package main
+
+import (
+	"crypto/tls"
+	"crypto/x509"
+	"fmt"
+	"io/ioutil"
+	"net/http"
+	"sync"
+)
+
+func main() {
+	pool := x509.NewCertPool()
+	caCertPath := "./ca.cert"
+
+	caCrt, err := ioutil.ReadFile(caCertPath)
+	if err != nil {
+		fmt.Println("ReadFile err:", err)
+		return
+	}
+	pool.AppendCertsFromPEM(caCrt)
+
+	tr := &http.Transport{
+		TLSClientConfig: &tls.Config{RootCAs: pool},
+	}
+
+	wg := sync.WaitGroup{}
+	wg.Add(20)
+
+	for i:=0;i<20;i++{
+		go func() {
+			client := &http.Client{Transport: tr}
+			resp, err := client.Get("https://localhost:8443")
+			if err != nil {
+				fmt.Println("Get error:", err)
+				return
+			}
+			defer resp.Body.Close()
+			body, err := ioutil.ReadAll(resp.Body)
+			fmt.Println(string(body))
+			wg.Done()
+		}()
+	}
+
+	wg.Wait()
+}
diff --git a/samplecode/mio/client-java/.gitignore b/samplecode/mio/client-java/.gitignore
new file mode 100644
index 000000000..a75153fc7
--- /dev/null
+++ b/samplecode/mio/client-java/.gitignore
@@ -0,0 +1,31 @@
+HELP.md
+/target/
+!.mvn/wrapper/maven-wrapper.jar
+pubkey.txt
+report.txt
+
+### STS ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+
+### IntelliJ IDEA ###
+.idea
+*.iws
+*.iml
+*.ipr
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+/build/
+
+### VS Code ###
+.vscode/
diff --git a/samplecode/mio/client-java/.mvn/wrapper/MavenWrapperDownloader.java b/samplecode/mio/client-java/.mvn/wrapper/MavenWrapperDownloader.java
new file mode 100644
index 000000000..72308aa47
--- /dev/null
+++ b/samplecode/mio/client-java/.mvn/wrapper/MavenWrapperDownloader.java
@@ -0,0 +1,114 @@
+/*
+Licensed to the Apache Software Foundation (ASF) under one
+or more contributor license agreements.  See the NOTICE file
+distributed with this work for additional information
+regarding copyright ownership.  The ASF licenses this file
+to you under the Apache License, Version 2.0 (the
+"License"); you may not use this file except in compliance
+with the License.  You may obtain a copy of the License at
+
+  https://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing,
+software distributed under the License is distributed on an
+"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+KIND, either express or implied.  See the License for the
+specific language governing permissions and limitations
+under the License.
+*/
+
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.net.URL;
+import java.nio.channels.Channels;
+import java.nio.channels.ReadableByteChannel;
+import java.util.Properties;
+
+public class MavenWrapperDownloader {
+
+    /**
+     * Default URL to download the maven-wrapper.jar from, if no 'downloadUrl' is provided.
+     */
+    private static final String DEFAULT_DOWNLOAD_URL =
+            "https://repo.maven.apache.org/maven2/io/takari/maven-wrapper/0.4.2/maven-wrapper-0.4.2.jar";
+
+    /**
+     * Path to the maven-wrapper.properties file, which might contain a downloadUrl property to
+     * use instead of the default one.
+     */
+    private static final String MAVEN_WRAPPER_PROPERTIES_PATH =
+            ".mvn/wrapper/maven-wrapper.properties";
+
+    /**
+     * Path where the maven-wrapper.jar will be saved to.
+     */
+    private static final String MAVEN_WRAPPER_JAR_PATH =
+            ".mvn/wrapper/maven-wrapper.jar";
+
+    /**
+     * Name of the property which should be used to override the default download url for the wrapper.
+     */
+    private static final String PROPERTY_NAME_WRAPPER_URL = "wrapperUrl";
+
+    public static void main(String args[]) {
+        System.out.println("- Downloader started");
+        File baseDirectory = new File(args[0]);
+        System.out.println("- Using base directory: " + baseDirectory.getAbsolutePath());
+
+        // If the maven-wrapper.properties exists, read it and check if it contains a custom
+        // wrapperUrl parameter.
+        File mavenWrapperPropertyFile = new File(baseDirectory, MAVEN_WRAPPER_PROPERTIES_PATH);
+        String url = DEFAULT_DOWNLOAD_URL;
+        if(mavenWrapperPropertyFile.exists()) {
+            FileInputStream mavenWrapperPropertyFileInputStream = null;
+            try {
+                mavenWrapperPropertyFileInputStream = new FileInputStream(mavenWrapperPropertyFile);
+                Properties mavenWrapperProperties = new Properties();
+                mavenWrapperProperties.load(mavenWrapperPropertyFileInputStream);
+                url = mavenWrapperProperties.getProperty(PROPERTY_NAME_WRAPPER_URL, url);
+            } catch (IOException e) {
+                System.out.println("- ERROR loading '" + MAVEN_WRAPPER_PROPERTIES_PATH + "'");
+            } finally {
+                try {
+                    if(mavenWrapperPropertyFileInputStream != null) {
+                        mavenWrapperPropertyFileInputStream.close();
+                    }
+                } catch (IOException e) {
+                    // Ignore ...
+                }
+            }
+        }
+        System.out.println("- Downloading from: : " + url);
+
+        File outputFile = new File(baseDirectory.getAbsolutePath(), MAVEN_WRAPPER_JAR_PATH);
+        if(!outputFile.getParentFile().exists()) {
+            if(!outputFile.getParentFile().mkdirs()) {
+                System.out.println(
+                        "- ERROR creating output direcrory '" + outputFile.getParentFile().getAbsolutePath() + "'");
+            }
+        }
+        System.out.println("- Downloading to: " + outputFile.getAbsolutePath());
+        try {
+            downloadFileFromURL(url, outputFile);
+            System.out.println("Done");
+            System.exit(0);
+        } catch (Throwable e) {
+            System.out.println("- Error downloading");
+            e.printStackTrace();
+            System.exit(1);
+        }
+    }
+
+    private static void downloadFileFromURL(String urlString, File destination) throws Exception {
+        URL website = new URL(urlString);
+        ReadableByteChannel rbc;
+        rbc = Channels.newChannel(website.openStream());
+        FileOutputStream fos = new FileOutputStream(destination);
+        fos.getChannel().transferFrom(rbc, 0, Long.MAX_VALUE);
+        fos.close();
+        rbc.close();
+    }
+
+}
diff --git a/samplecode/mio/client-java/.mvn/wrapper/maven-wrapper.jar b/samplecode/mio/client-java/.mvn/wrapper/maven-wrapper.jar
new file mode 100644
index 000000000..01e679973
Binary files /dev/null and b/samplecode/mio/client-java/.mvn/wrapper/maven-wrapper.jar differ
diff --git a/samplecode/mio/client-java/.mvn/wrapper/maven-wrapper.properties b/samplecode/mio/client-java/.mvn/wrapper/maven-wrapper.properties
new file mode 100644
index 000000000..cd0d451cc
--- /dev/null
+++ b/samplecode/mio/client-java/.mvn/wrapper/maven-wrapper.properties
@@ -0,0 +1 @@
+distributionUrl=https://repo.maven.apache.org/maven2/org/apache/maven/apache-maven/3.6.0/apache-maven-3.6.0-bin.zip
diff --git a/samplecode/mio/client-java/ca.cert b/samplecode/mio/client-java/ca.cert
new file mode 100644
index 000000000..a18fb02cf
--- /dev/null
+++ b/samplecode/mio/client-java/ca.cert
@@ -0,0 +1,51 @@
+-----BEGIN CERTIFICATE-----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+-----END CERTIFICATE-----
diff --git a/samplecode/mio/client-java/mvnw b/samplecode/mio/client-java/mvnw
new file mode 100755
index 000000000..8b9da3b8b
--- /dev/null
+++ b/samplecode/mio/client-java/mvnw
@@ -0,0 +1,286 @@
+#!/bin/sh
+# ----------------------------------------------------------------------------
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#    https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+# ----------------------------------------------------------------------------
+
+# ----------------------------------------------------------------------------
+# Maven2 Start Up Batch script
+#
+# Required ENV vars:
+# ------------------
+#   JAVA_HOME - location of a JDK home dir
+#
+# Optional ENV vars
+# -----------------
+#   M2_HOME - location of maven2's installed home dir
+#   MAVEN_OPTS - parameters passed to the Java VM when running Maven
+#     e.g. to debug Maven itself, use
+#       set MAVEN_OPTS=-Xdebug -Xrunjdwp:transport=dt_socket,server=y,suspend=y,address=8000
+#   MAVEN_SKIP_RC - flag to disable loading of mavenrc files
+# ----------------------------------------------------------------------------
+
+if [ -z "$MAVEN_SKIP_RC" ] ; then
+
+  if [ -f /etc/mavenrc ] ; then
+    . /etc/mavenrc
+  fi
+
+  if [ -f "$HOME/.mavenrc" ] ; then
+    . "$HOME/.mavenrc"
+  fi
+
+fi
+
+# OS specific support.  $var _must_ be set to either true or false.
+cygwin=false;
+darwin=false;
+mingw=false
+case "`uname`" in
+  CYGWIN*) cygwin=true ;;
+  MINGW*) mingw=true;;
+  Darwin*) darwin=true
+    # Use /usr/libexec/java_home if available, otherwise fall back to /Library/Java/Home
+    # See https://developer.apple.com/library/mac/qa/qa1170/_index.html
+    if [ -z "$JAVA_HOME" ]; then
+      if [ -x "/usr/libexec/java_home" ]; then
+        export JAVA_HOME="`/usr/libexec/java_home`"
+      else
+        export JAVA_HOME="/Library/Java/Home"
+      fi
+    fi
+    ;;
+esac
+
+if [ -z "$JAVA_HOME" ] ; then
+  if [ -r /etc/gentoo-release ] ; then
+    JAVA_HOME=`java-config --jre-home`
+  fi
+fi
+
+if [ -z "$M2_HOME" ] ; then
+  ## resolve links - $0 may be a link to maven's home
+  PRG="$0"
+
+  # need this for relative symlinks
+  while [ -h "$PRG" ] ; do
+    ls=`ls -ld "$PRG"`
+    link=`expr "$ls" : '.*-> \(.*\)$'`
+    if expr "$link" : '/.*' > /dev/null; then
+      PRG="$link"
+    else
+      PRG="`dirname "$PRG"`/$link"
+    fi
+  done
+
+  saveddir=`pwd`
+
+  M2_HOME=`dirname "$PRG"`/..
+
+  # make it fully qualified
+  M2_HOME=`cd "$M2_HOME" && pwd`
+
+  cd "$saveddir"
+  # echo Using m2 at $M2_HOME
+fi
+
+# For Cygwin, ensure paths are in UNIX format before anything is touched
+if $cygwin ; then
+  [ -n "$M2_HOME" ] &&
+    M2_HOME=`cygpath --unix "$M2_HOME"`
+  [ -n "$JAVA_HOME" ] &&
+    JAVA_HOME=`cygpath --unix "$JAVA_HOME"`
+  [ -n "$CLASSPATH" ] &&
+    CLASSPATH=`cygpath --path --unix "$CLASSPATH"`
+fi
+
+# For Mingw, ensure paths are in UNIX format before anything is touched
+if $mingw ; then
+  [ -n "$M2_HOME" ] &&
+    M2_HOME="`(cd "$M2_HOME"; pwd)`"
+  [ -n "$JAVA_HOME" ] &&
+    JAVA_HOME="`(cd "$JAVA_HOME"; pwd)`"
+  # TODO classpath?
+fi
+
+if [ -z "$JAVA_HOME" ]; then
+  javaExecutable="`which javac`"
+  if [ -n "$javaExecutable" ] && ! [ "`expr \"$javaExecutable\" : '\([^ ]*\)'`" = "no" ]; then
+    # readlink(1) is not available as standard on Solaris 10.
+    readLink=`which readlink`
+    if [ ! `expr "$readLink" : '\([^ ]*\)'` = "no" ]; then
+      if $darwin ; then
+        javaHome="`dirname \"$javaExecutable\"`"
+        javaExecutable="`cd \"$javaHome\" && pwd -P`/javac"
+      else
+        javaExecutable="`readlink -f \"$javaExecutable\"`"
+      fi
+      javaHome="`dirname \"$javaExecutable\"`"
+      javaHome=`expr "$javaHome" : '\(.*\)/bin'`
+      JAVA_HOME="$javaHome"
+      export JAVA_HOME
+    fi
+  fi
+fi
+
+if [ -z "$JAVACMD" ] ; then
+  if [ -n "$JAVA_HOME"  ] ; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+      # IBM's JDK on AIX uses strange locations for the executables
+      JAVACMD="$JAVA_HOME/jre/sh/java"
+    else
+      JAVACMD="$JAVA_HOME/bin/java"
+    fi
+  else
+    JAVACMD="`which java`"
+  fi
+fi
+
+if [ ! -x "$JAVACMD" ] ; then
+  echo "Error: JAVA_HOME is not defined correctly." >&2
+  echo "  We cannot execute $JAVACMD" >&2
+  exit 1
+fi
+
+if [ -z "$JAVA_HOME" ] ; then
+  echo "Warning: JAVA_HOME environment variable is not set."
+fi
+
+CLASSWORLDS_LAUNCHER=org.codehaus.plexus.classworlds.launcher.Launcher
+
+# traverses directory structure from process work directory to filesystem root
+# first directory with .mvn subdirectory is considered project base directory
+find_maven_basedir() {
+
+  if [ -z "$1" ]
+  then
+    echo "Path not specified to find_maven_basedir"
+    return 1
+  fi
+
+  basedir="$1"
+  wdir="$1"
+  while [ "$wdir" != '/' ] ; do
+    if [ -d "$wdir"/.mvn ] ; then
+      basedir=$wdir
+      break
+    fi
+    # workaround for JBEAP-8937 (on Solaris 10/Sparc)
+    if [ -d "${wdir}" ]; then
+      wdir=`cd "$wdir/.."; pwd`
+    fi
+    # end of workaround
+  done
+  echo "${basedir}"
+}
+
+# concatenates all lines of a file
+concat_lines() {
+  if [ -f "$1" ]; then
+    echo "$(tr -s '\n' ' ' < "$1")"
+  fi
+}
+
+BASE_DIR=`find_maven_basedir "$(pwd)"`
+if [ -z "$BASE_DIR" ]; then
+  exit 1;
+fi
+
+##########################################################################################
+# Extension to allow automatically downloading the maven-wrapper.jar from Maven-central
+# This allows using the maven wrapper in projects that prohibit checking in binary data.
+##########################################################################################
+if [ -r "$BASE_DIR/.mvn/wrapper/maven-wrapper.jar" ]; then
+    if [ "$MVNW_VERBOSE" = true ]; then
+      echo "Found .mvn/wrapper/maven-wrapper.jar"
+    fi
+else
+    if [ "$MVNW_VERBOSE" = true ]; then
+      echo "Couldn't find .mvn/wrapper/maven-wrapper.jar, downloading it ..."
+    fi
+    jarUrl="https://repo.maven.apache.org/maven2/io/takari/maven-wrapper/0.4.2/maven-wrapper-0.4.2.jar"
+    while IFS="=" read key value; do
+      case "$key" in (wrapperUrl) jarUrl="$value"; break ;;
+      esac
+    done < "$BASE_DIR/.mvn/wrapper/maven-wrapper.properties"
+    if [ "$MVNW_VERBOSE" = true ]; then
+      echo "Downloading from: $jarUrl"
+    fi
+    wrapperJarPath="$BASE_DIR/.mvn/wrapper/maven-wrapper.jar"
+
+    if command -v wget > /dev/null; then
+        if [ "$MVNW_VERBOSE" = true ]; then
+          echo "Found wget ... using wget"
+        fi
+        wget "$jarUrl" -O "$wrapperJarPath"
+    elif command -v curl > /dev/null; then
+        if [ "$MVNW_VERBOSE" = true ]; then
+          echo "Found curl ... using curl"
+        fi
+        curl -o "$wrapperJarPath" "$jarUrl"
+    else
+        if [ "$MVNW_VERBOSE" = true ]; then
+          echo "Falling back to using Java to download"
+        fi
+        javaClass="$BASE_DIR/.mvn/wrapper/MavenWrapperDownloader.java"
+        if [ -e "$javaClass" ]; then
+            if [ ! -e "$BASE_DIR/.mvn/wrapper/MavenWrapperDownloader.class" ]; then
+                if [ "$MVNW_VERBOSE" = true ]; then
+                  echo " - Compiling MavenWrapperDownloader.java ..."
+                fi
+                # Compiling the Java class
+                ("$JAVA_HOME/bin/javac" "$javaClass")
+            fi
+            if [ -e "$BASE_DIR/.mvn/wrapper/MavenWrapperDownloader.class" ]; then
+                # Running the downloader
+                if [ "$MVNW_VERBOSE" = true ]; then
+                  echo " - Running MavenWrapperDownloader.java ..."
+                fi
+                ("$JAVA_HOME/bin/java" -cp .mvn/wrapper MavenWrapperDownloader "$MAVEN_PROJECTBASEDIR")
+            fi
+        fi
+    fi
+fi
+##########################################################################################
+# End of extension
+##########################################################################################
+
+export MAVEN_PROJECTBASEDIR=${MAVEN_BASEDIR:-"$BASE_DIR"}
+if [ "$MVNW_VERBOSE" = true ]; then
+  echo $MAVEN_PROJECTBASEDIR
+fi
+MAVEN_OPTS="$(concat_lines "$MAVEN_PROJECTBASEDIR/.mvn/jvm.config") $MAVEN_OPTS"
+
+# For Cygwin, switch paths to Windows format before running java
+if $cygwin; then
+  [ -n "$M2_HOME" ] &&
+    M2_HOME=`cygpath --path --windows "$M2_HOME"`
+  [ -n "$JAVA_HOME" ] &&
+    JAVA_HOME=`cygpath --path --windows "$JAVA_HOME"`
+  [ -n "$CLASSPATH" ] &&
+    CLASSPATH=`cygpath --path --windows "$CLASSPATH"`
+  [ -n "$MAVEN_PROJECTBASEDIR" ] &&
+    MAVEN_PROJECTBASEDIR=`cygpath --path --windows "$MAVEN_PROJECTBASEDIR"`
+fi
+
+WRAPPER_LAUNCHER=org.apache.maven.wrapper.MavenWrapperMain
+
+exec "$JAVACMD" \
+  $MAVEN_OPTS \
+  -classpath "$MAVEN_PROJECTBASEDIR/.mvn/wrapper/maven-wrapper.jar" \
+  "-Dmaven.home=${M2_HOME}" "-Dmaven.multiModuleProjectDirectory=${MAVEN_PROJECTBASEDIR}" \
+  ${WRAPPER_LAUNCHER} $MAVEN_CONFIG "$@"
diff --git a/samplecode/mio/client-java/mvnw.cmd b/samplecode/mio/client-java/mvnw.cmd
new file mode 100644
index 000000000..fef5a8f7f
--- /dev/null
+++ b/samplecode/mio/client-java/mvnw.cmd
@@ -0,0 +1,161 @@
+@REM ----------------------------------------------------------------------------
+@REM Licensed to the Apache Software Foundation (ASF) under one
+@REM or more contributor license agreements.  See the NOTICE file
+@REM distributed with this work for additional information
+@REM regarding copyright ownership.  The ASF licenses this file
+@REM to you under the Apache License, Version 2.0 (the
+@REM "License"); you may not use this file except in compliance
+@REM with the License.  You may obtain a copy of the License at
+@REM
+@REM    https://www.apache.org/licenses/LICENSE-2.0
+@REM
+@REM Unless required by applicable law or agreed to in writing,
+@REM software distributed under the License is distributed on an
+@REM "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+@REM KIND, either express or implied.  See the License for the
+@REM specific language governing permissions and limitations
+@REM under the License.
+@REM ----------------------------------------------------------------------------
+
+@REM ----------------------------------------------------------------------------
+@REM Maven2 Start Up Batch script
+@REM
+@REM Required ENV vars:
+@REM JAVA_HOME - location of a JDK home dir
+@REM
+@REM Optional ENV vars
+@REM M2_HOME - location of maven2's installed home dir
+@REM MAVEN_BATCH_ECHO - set to 'on' to enable the echoing of the batch commands
+@REM MAVEN_BATCH_PAUSE - set to 'on' to wait for a key stroke before ending
+@REM MAVEN_OPTS - parameters passed to the Java VM when running Maven
+@REM     e.g. to debug Maven itself, use
+@REM set MAVEN_OPTS=-Xdebug -Xrunjdwp:transport=dt_socket,server=y,suspend=y,address=8000
+@REM MAVEN_SKIP_RC - flag to disable loading of mavenrc files
+@REM ----------------------------------------------------------------------------
+
+@REM Begin all REM lines with '@' in case MAVEN_BATCH_ECHO is 'on'
+@echo off
+@REM set title of command window
+title %0
+@REM enable echoing my setting MAVEN_BATCH_ECHO to 'on'
+@if "%MAVEN_BATCH_ECHO%" == "on"  echo %MAVEN_BATCH_ECHO%
+
+@REM set %HOME% to equivalent of $HOME
+if "%HOME%" == "" (set "HOME=%HOMEDRIVE%%HOMEPATH%")
+
+@REM Execute a user defined script before this one
+if not "%MAVEN_SKIP_RC%" == "" goto skipRcPre
+@REM check for pre script, once with legacy .bat ending and once with .cmd ending
+if exist "%HOME%\mavenrc_pre.bat" call "%HOME%\mavenrc_pre.bat"
+if exist "%HOME%\mavenrc_pre.cmd" call "%HOME%\mavenrc_pre.cmd"
+:skipRcPre
+
+@setlocal
+
+set ERROR_CODE=0
+
+@REM To isolate internal variables from possible post scripts, we use another setlocal
+@setlocal
+
+@REM ==== START VALIDATION ====
+if not "%JAVA_HOME%" == "" goto OkJHome
+
+echo.
+echo Error: JAVA_HOME not found in your environment. >&2
+echo Please set the JAVA_HOME variable in your environment to match the >&2
+echo location of your Java installation. >&2
+echo.
+goto error
+
+:OkJHome
+if exist "%JAVA_HOME%\bin\java.exe" goto init
+
+echo.
+echo Error: JAVA_HOME is set to an invalid directory. >&2
+echo JAVA_HOME = "%JAVA_HOME%" >&2
+echo Please set the JAVA_HOME variable in your environment to match the >&2
+echo location of your Java installation. >&2
+echo.
+goto error
+
+@REM ==== END VALIDATION ====
+
+:init
+
+@REM Find the project base dir, i.e. the directory that contains the folder ".mvn".
+@REM Fallback to current working directory if not found.
+
+set MAVEN_PROJECTBASEDIR=%MAVEN_BASEDIR%
+IF NOT "%MAVEN_PROJECTBASEDIR%"=="" goto endDetectBaseDir
+
+set EXEC_DIR=%CD%
+set WDIR=%EXEC_DIR%
+:findBaseDir
+IF EXIST "%WDIR%"\.mvn goto baseDirFound
+cd ..
+IF "%WDIR%"=="%CD%" goto baseDirNotFound
+set WDIR=%CD%
+goto findBaseDir
+
+:baseDirFound
+set MAVEN_PROJECTBASEDIR=%WDIR%
+cd "%EXEC_DIR%"
+goto endDetectBaseDir
+
+:baseDirNotFound
+set MAVEN_PROJECTBASEDIR=%EXEC_DIR%
+cd "%EXEC_DIR%"
+
+:endDetectBaseDir
+
+IF NOT EXIST "%MAVEN_PROJECTBASEDIR%\.mvn\jvm.config" goto endReadAdditionalConfig
+
+@setlocal EnableExtensions EnableDelayedExpansion
+for /F "usebackq delims=" %%a in ("%MAVEN_PROJECTBASEDIR%\.mvn\jvm.config") do set JVM_CONFIG_MAVEN_PROPS=!JVM_CONFIG_MAVEN_PROPS! %%a
+@endlocal & set JVM_CONFIG_MAVEN_PROPS=%JVM_CONFIG_MAVEN_PROPS%
+
+:endReadAdditionalConfig
+
+SET MAVEN_JAVA_EXE="%JAVA_HOME%\bin\java.exe"
+set WRAPPER_JAR="%MAVEN_PROJECTBASEDIR%\.mvn\wrapper\maven-wrapper.jar"
+set WRAPPER_LAUNCHER=org.apache.maven.wrapper.MavenWrapperMain
+
+set DOWNLOAD_URL="https://repo.maven.apache.org/maven2/io/takari/maven-wrapper/0.4.2/maven-wrapper-0.4.2.jar"
+FOR /F "tokens=1,2 delims==" %%A IN (%MAVEN_PROJECTBASEDIR%\.mvn\wrapper\maven-wrapper.properties) DO (
+	IF "%%A"=="wrapperUrl" SET DOWNLOAD_URL=%%B 
+)
+
+@REM Extension to allow automatically downloading the maven-wrapper.jar from Maven-central
+@REM This allows using the maven wrapper in projects that prohibit checking in binary data.
+if exist %WRAPPER_JAR% (
+    echo Found %WRAPPER_JAR%
+) else (
+    echo Couldn't find %WRAPPER_JAR%, downloading it ...
+	echo Downloading from: %DOWNLOAD_URL%
+    powershell -Command "(New-Object Net.WebClient).DownloadFile('%DOWNLOAD_URL%', '%WRAPPER_JAR%')"
+    echo Finished downloading %WRAPPER_JAR%
+)
+@REM End of extension
+
+%MAVEN_JAVA_EXE% %JVM_CONFIG_MAVEN_PROPS% %MAVEN_OPTS% %MAVEN_DEBUG_OPTS% -classpath %WRAPPER_JAR% "-Dmaven.multiModuleProjectDirectory=%MAVEN_PROJECTBASEDIR%" %WRAPPER_LAUNCHER% %MAVEN_CONFIG% %*
+if ERRORLEVEL 1 goto error
+goto end
+
+:error
+set ERROR_CODE=1
+
+:end
+@endlocal & set ERROR_CODE=%ERROR_CODE%
+
+if not "%MAVEN_SKIP_RC%" == "" goto skipRcPost
+@REM check for post script, once with legacy .bat ending and once with .cmd ending
+if exist "%HOME%\mavenrc_post.bat" call "%HOME%\mavenrc_post.bat"
+if exist "%HOME%\mavenrc_post.cmd" call "%HOME%\mavenrc_post.cmd"
+:skipRcPost
+
+@REM pause the script if MAVEN_BATCH_PAUSE is set to 'on'
+if "%MAVEN_BATCH_PAUSE%" == "on" pause
+
+if "%MAVEN_TERMINATE_CMD%" == "on" exit %ERROR_CODE%
+
+exit /B %ERROR_CODE%
diff --git a/samplecode/mio/client-java/pom.xml b/samplecode/mio/client-java/pom.xml
new file mode 100644
index 000000000..843515f22
--- /dev/null
+++ b/samplecode/mio/client-java/pom.xml
@@ -0,0 +1,83 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+	<modelVersion>4.0.0</modelVersion>
+	<parent>
+		<groupId>org.springframework.boot</groupId>
+		<artifactId>spring-boot-starter-parent</artifactId>
+		<version>2.1.4.RELEASE</version>
+		<relativePath/> <!-- lookup parent from repository -->
+	</parent>
+	<groupId>org.rustsgx.mio</groupId>
+	<artifactId>client-java</artifactId>
+	<version>0.0.1-SNAPSHOT</version>
+	<name>client-java</name>
+	<description>Demo project for Spring Boot</description>
+
+	<properties>
+		<java.version>1.8</java.version>
+		<!-- Bouncy Castle -->
+		<bouncycastle.version>1.58</bouncycastle.version>
+	</properties>
+
+	<dependencies>
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-starter</artifactId>
+		</dependency>
+
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-starter-test</artifactId>
+			<scope>test</scope>
+		</dependency>
+
+		<!-- https://mvnrepository.com/artifact/org.bouncycastle/bcpkix-jdk15on -->
+		<dependency>
+			<groupId>org.bouncycastle</groupId>
+			<artifactId>bcpkix-jdk15on</artifactId>
+			<version>${bouncycastle.version}</version>
+		</dependency>
+
+		<!-- https://mvnrepository.com/artifact/com.google.code.gson/gson -->
+		<dependency>
+			<groupId>com.google.code.gson</groupId>
+			<artifactId>gson</artifactId>
+			<version>2.8.2</version>
+		</dependency>
+
+		<!-- https://mvnrepository.com/artifact/joda-time/joda-time -->
+		<dependency>
+			<groupId>joda-time</groupId>
+			<artifactId>joda-time</artifactId>
+			<version>2.9.9</version>
+		</dependency>
+
+		<!-- https://mvnrepository.com/artifact/org.bouncycastle/bcprov-jdk16 -->
+		<dependency>
+			<groupId>org.bouncycastle</groupId>
+			<artifactId>bcprov-jdk16</artifactId>
+			<version>1.45</version>
+		</dependency>
+		<dependency>
+			<groupId>commons-io</groupId>
+			<artifactId>commons-io</artifactId>
+			<version>2.4</version>
+		</dependency>
+		<dependency>
+			<groupId>org.apache.httpcomponents</groupId>
+			<artifactId>httpclient</artifactId>
+			<version>4.4</version>
+		</dependency>
+	</dependencies>
+
+	<build>
+		<plugins>
+			<plugin>
+				<groupId>org.springframework.boot</groupId>
+				<artifactId>spring-boot-maven-plugin</artifactId>
+			</plugin>
+		</plugins>
+	</build>
+
+</project>
diff --git a/samplecode/mio/client-java/src/main/java/org/rustsgx/mio/AppClient.java b/samplecode/mio/client-java/src/main/java/org/rustsgx/mio/AppClient.java
new file mode 100644
index 000000000..ee57bb8e8
--- /dev/null
+++ b/samplecode/mio/client-java/src/main/java/org/rustsgx/mio/AppClient.java
@@ -0,0 +1,78 @@
+package org.rustsgx.mio;
+
+import org.apache.commons.io.IOUtils;
+import org.apache.http.NameValuePair;
+import org.apache.http.client.utils.URIBuilder;
+import org.apache.http.message.BasicNameValuePair;
+
+import javax.net.ssl.HttpsURLConnection;
+import java.io.IOException;
+import java.io.StringWriter;
+import java.net.HttpURLConnection;
+import java.net.URI;
+import java.net.URISyntaxException;
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+
+public class AppClient {
+
+    private String scheme = null;
+    private String url = null;
+    private int port = 80;
+
+
+    public AppClient(final String scheme, final String url, final int port) {
+        this.scheme = scheme;
+        this.url = url;
+        this.port = port;
+    }
+
+    public String request(final String requestType,
+                          final String endpoint,
+                          final HashMap<String, String> parameters) throws URISyntaxException, IOException {
+        HttpURLConnection conn = null;
+
+        try {
+
+            List<NameValuePair> nameValues = new ArrayList<NameValuePair>();
+            for (String identifier : parameters.keySet()) {
+                NameValuePair pair = new BasicNameValuePair(identifier, parameters.get(identifier));
+                nameValues.add(pair);
+            }
+
+            URI uri = new URIBuilder()
+                    .setScheme(this.scheme)
+                    .setHost(this.url)
+                    .setPort(this.port)
+                    .setPath(endpoint)
+                    .setParameters(nameValues)
+                    .build();
+
+
+            if (requestType.equals("https")) {
+                HttpsURLConnection httpsConn = (HttpsURLConnection) uri.toURL().openConnection();
+                httpsConn.setRequestMethod(requestType);
+                httpsConn.setDoInput(true);
+                httpsConn.connect();
+                conn = httpsConn;
+            } else {
+                HttpURLConnection httpConn = (HttpURLConnection) uri.toURL().openConnection();
+                httpConn.setRequestMethod(requestType);
+                httpConn.setDoInput(true);
+                httpConn.connect();
+                conn = httpConn;
+            }
+
+            StringWriter writer = new StringWriter();
+            IOUtils.copy(conn.getInputStream(), writer, "UTF-8");
+
+            return writer.toString();
+
+        } finally {
+            if (conn != null) {
+                conn.disconnect();
+            }
+        }
+    }
+}
diff --git a/samplecode/mio/client-java/src/main/java/org/rustsgx/mio/MIOClientApplication.java b/samplecode/mio/client-java/src/main/java/org/rustsgx/mio/MIOClientApplication.java
new file mode 100644
index 000000000..4042696d2
--- /dev/null
+++ b/samplecode/mio/client-java/src/main/java/org/rustsgx/mio/MIOClientApplication.java
@@ -0,0 +1,34 @@
+package org.rustsgx.mio;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+import java.net.Socket;
+import java.util.HashMap;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+import java.util.concurrent.TimeUnit;
+
+
+@SpringBootApplication
+public class MIOClientApplication {
+    public static void main(String[] args) throws Exception {
+        System.out.println("This is a mio client application");
+
+        SSLHelper.loadCerts("ca.cert");
+
+        int count = 20;
+        ExecutorService service = Executors.newFixedThreadPool(count);
+        for (int i = 0; i < count; i++) {
+            service.execute(() -> {
+                try {
+                    AppClient appClient = new AppClient("https", "localhost", 8443);
+                    System.out.println(appClient.request("GET", "/", new HashMap<>()));
+                    Thread.sleep(10000);
+                } catch (Exception ex) {
+                    ex.printStackTrace();
+                }
+            });
+        }
+        service.shutdown();
+        service.awaitTermination(10000000, TimeUnit.SECONDS);
+    }
+}
diff --git a/samplecode/mio/client-java/src/main/java/org/rustsgx/mio/SSLHelper.java b/samplecode/mio/client-java/src/main/java/org/rustsgx/mio/SSLHelper.java
new file mode 100644
index 000000000..34ad1b05c
--- /dev/null
+++ b/samplecode/mio/client-java/src/main/java/org/rustsgx/mio/SSLHelper.java
@@ -0,0 +1,46 @@
+package org.rustsgx.mio;
+
+import javax.net.ssl.*;
+import java.io.File;
+import java.io.IOException;
+import java.net.URISyntaxException;
+import java.security.KeyManagementException;
+import java.security.KeyStore;
+import java.security.KeyStoreException;
+import java.security.NoSuchAlgorithmException;
+import java.security.cert.Certificate;
+import java.security.cert.CertificateException;
+import java.security.cert.CertificateFactory;
+import java.util.Collection;
+
+public class SSLHelper {
+
+    public static void loadCerts(String fileName) throws KeyStoreException, CertificateException, NoSuchAlgorithmException, KeyManagementException, IOException, URISyntaxException {
+        ClassLoader classLoader = SSLHelper.class.getClassLoader();
+        final CertificateFactory certFactory = CertificateFactory.getInstance("X.509");
+        final Collection<? extends Certificate> certs = certFactory.generateCertificates(classLoader.getResourceAsStream(fileName));
+
+
+        KeyStore keyStore = KeyStore.getInstance(KeyStore.getDefaultType());
+        keyStore.load(null, null);
+        certs.iterator().forEachRemaining(cert -> {
+            try {
+                keyStore.setCertificateEntry(java.util.UUID.randomUUID().toString(), cert);
+            } catch (KeyStoreException e) {
+                e.printStackTrace();
+            }
+        });
+
+        TrustManagerFactory tmf =
+                TrustManagerFactory.getInstance(TrustManagerFactory.getDefaultAlgorithm());
+        tmf.init(keyStore);
+
+        TrustManager[] trustManager = tmf.getTrustManagers();
+
+        SSLContext context = SSLContext.getInstance("TLS");
+        context.init(null, trustManager, new java.security.SecureRandom());
+
+        SSLSocketFactory sslFactory = context.getSocketFactory();
+        HttpsURLConnection.setDefaultSSLSocketFactory(sslFactory);
+    }
+}
\ No newline at end of file
diff --git a/samplecode/mio/client-java/src/main/resources/application.properties b/samplecode/mio/client-java/src/main/resources/application.properties
new file mode 100644
index 000000000..8b1378917
--- /dev/null
+++ b/samplecode/mio/client-java/src/main/resources/application.properties
@@ -0,0 +1 @@
+
diff --git a/samplecode/mio/client-java/src/main/resources/ca.cert b/samplecode/mio/client-java/src/main/resources/ca.cert
new file mode 100644
index 000000000..a18fb02cf
--- /dev/null
+++ b/samplecode/mio/client-java/src/main/resources/ca.cert
@@ -0,0 +1,51 @@
+-----BEGIN CERTIFICATE-----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+-----END CERTIFICATE-----