diff --git a/HttpProxy/build.gradle b/HttpProxy/build.gradle
new file mode 100644
index 0000000..c8ed2cc
--- /dev/null
+++ b/HttpProxy/build.gradle
@@ -0,0 +1,21 @@
+plugins {
+    id 'org.jetbrains.kotlin.jvm' version '1.3.21'
+}
+
+group 'http-proxy'
+version '1.0-SNAPSHOT'
+
+repositories {
+    mavenCentral()
+}
+
+dependencies {
+    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk8"
+}
+
+compileKotlin {
+    kotlinOptions.jvmTarget = "1.8"
+}
+compileTestKotlin {
+    kotlinOptions.jvmTarget = "1.8"
+}
\ No newline at end of file
diff --git a/HttpProxy/gradle.properties b/HttpProxy/gradle.properties
new file mode 100644
index 0000000..29e08e8
--- /dev/null
+++ b/HttpProxy/gradle.properties
@@ -0,0 +1 @@
+kotlin.code.style=official
\ No newline at end of file
diff --git a/HttpProxy/gradlew b/HttpProxy/gradlew
new file mode 100755
index 0000000..cccdd3d
--- /dev/null
+++ b/HttpProxy/gradlew
@@ -0,0 +1,172 @@
+#!/usr/bin/env sh
+
+##############################################################################
+##
+##  Gradle start up script for UN*X
+##
+##############################################################################
+
+# Attempt to set APP_HOME
+# Resolve links: $0 may be a link
+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"`"/$link"
+    fi
+done
+SAVED="`pwd`"
+cd "`dirname \"$PRG\"`/" >/dev/null
+APP_HOME="`pwd -P`"
+cd "$SAVED" >/dev/null
+
+APP_NAME="Gradle"
+APP_BASE_NAME=`basename "$0"`
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS=""
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD="maximum"
+
+warn () {
+    echo "$*"
+}
+
+die () {
+    echo
+    echo "$*"
+    echo
+    exit 1
+}
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "`uname`" in
+  CYGWIN* )
+    cygwin=true
+    ;;
+  Darwin* )
+    darwin=true
+    ;;
+  MINGW* )
+    msys=true
+    ;;
+  NONSTOP* )
+    nonstop=true
+    ;;
+esac
+
+CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
+
+# Determine the Java command to use to start the JVM.
+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
+    if [ ! -x "$JAVACMD" ] ; then
+        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+else
+    JAVACMD="java"
+    which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+fi
+
+# Increase the maximum file descriptors if we can.
+if [ "$cygwin" = "false" -a "$darwin" = "false" -a "$nonstop" = "false" ] ; then
+    MAX_FD_LIMIT=`ulimit -H -n`
+    if [ $? -eq 0 ] ; then
+        if [ "$MAX_FD" = "maximum" -o "$MAX_FD" = "max" ] ; then
+            MAX_FD="$MAX_FD_LIMIT"
+        fi
+        ulimit -n $MAX_FD
+        if [ $? -ne 0 ] ; then
+            warn "Could not set maximum file descriptor limit: $MAX_FD"
+        fi
+    else
+        warn "Could not query maximum file descriptor limit: $MAX_FD_LIMIT"
+    fi
+fi
+
+# For Darwin, add options to specify how the application appears in the dock
+if $darwin; then
+    GRADLE_OPTS="$GRADLE_OPTS \"-Xdock:name=$APP_NAME\" \"-Xdock:icon=$APP_HOME/media/gradle.icns\""
+fi
+
+# For Cygwin, switch paths to Windows format before running java
+if $cygwin ; then
+    APP_HOME=`cygpath --path --mixed "$APP_HOME"`
+    CLASSPATH=`cygpath --path --mixed "$CLASSPATH"`
+    JAVACMD=`cygpath --unix "$JAVACMD"`
+
+    # We build the pattern for arguments to be converted via cygpath
+    ROOTDIRSRAW=`find -L / -maxdepth 1 -mindepth 1 -type d 2>/dev/null`
+    SEP=""
+    for dir in $ROOTDIRSRAW ; do
+        ROOTDIRS="$ROOTDIRS$SEP$dir"
+        SEP="|"
+    done
+    OURCYGPATTERN="(^($ROOTDIRS))"
+    # Add a user-defined pattern to the cygpath arguments
+    if [ "$GRADLE_CYGPATTERN" != "" ] ; then
+        OURCYGPATTERN="$OURCYGPATTERN|($GRADLE_CYGPATTERN)"
+    fi
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    i=0
+    for arg in "$@" ; do
+        CHECK=`echo "$arg"|egrep -c "$OURCYGPATTERN" -`
+        CHECK2=`echo "$arg"|egrep -c "^-"`                                 ### Determine if an option
+
+        if [ $CHECK -ne 0 ] && [ $CHECK2 -eq 0 ] ; then                    ### Added a condition
+            eval `echo args$i`=`cygpath --path --ignore --mixed "$arg"`
+        else
+            eval `echo args$i`="\"$arg\""
+        fi
+        i=$((i+1))
+    done
+    case $i in
+        (0) set -- ;;
+        (1) set -- "$args0" ;;
+        (2) set -- "$args0" "$args1" ;;
+        (3) set -- "$args0" "$args1" "$args2" ;;
+        (4) set -- "$args0" "$args1" "$args2" "$args3" ;;
+        (5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;;
+        (6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;;
+        (7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;;
+        (8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;;
+        (9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;;
+    esac
+fi
+
+# Escape application args
+save () {
+    for i do printf %s\\n "$i" | sed "s/'/'\\\\''/g;1s/^/'/;\$s/\$/' \\\\/" ; done
+    echo " "
+}
+APP_ARGS=$(save "$@")
+
+# Collect all arguments for the java command, following the shell quoting and substitution rules
+eval set -- $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS "\"-Dorg.gradle.appname=$APP_BASE_NAME\"" -classpath "\"$CLASSPATH\"" org.gradle.wrapper.GradleWrapperMain "$APP_ARGS"
+
+# by default we should be in the correct project dir, but when run from Finder on Mac, the cwd is wrong
+if [ "$(uname)" = "Darwin" ] && [ "$HOME" = "$PWD" ]; then
+  cd "$(dirname "$0")"
+fi
+
+exec "$JAVACMD" "$@"
diff --git a/HttpProxy/gradlew.bat b/HttpProxy/gradlew.bat
new file mode 100644
index 0000000..e95643d
--- /dev/null
+++ b/HttpProxy/gradlew.bat
@@ -0,0 +1,84 @@
+@if "%DEBUG%" == "" @echo off
+@rem ##########################################################################
+@rem
+@rem  Gradle startup script for Windows
+@rem
+@rem ##########################################################################
+
+@rem Set local scope for the variables with windows NT shell
+if "%OS%"=="Windows_NT" setlocal
+
+set DIRNAME=%~dp0
+if "%DIRNAME%" == "" set DIRNAME=.
+set APP_BASE_NAME=%~n0
+set APP_HOME=%DIRNAME%
+
+@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+set DEFAULT_JVM_OPTS=
+
+@rem Find java.exe
+if defined JAVA_HOME goto findJavaFromJavaHome
+
+set JAVA_EXE=java.exe
+%JAVA_EXE% -version >NUL 2>&1
+if "%ERRORLEVEL%" == "0" goto init
+
+echo.
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto init
+
+echo.
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:init
+@rem Get command-line arguments, handling Windows variants
+
+if not "%OS%" == "Windows_NT" goto win9xME_args
+
+:win9xME_args
+@rem Slurp the command line arguments.
+set CMD_LINE_ARGS=
+set _SKIP=2
+
+:win9xME_args_slurp
+if "x%~1" == "x" goto execute
+
+set CMD_LINE_ARGS=%*
+
+:execute
+@rem Setup the command line
+
+set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
+
+@rem Execute Gradle
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %CMD_LINE_ARGS%
+
+:end
+@rem End local scope for the variables with windows NT shell
+if "%ERRORLEVEL%"=="0" goto mainEnd
+
+:fail
+rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
+rem the _cmd.exe /c_ return code!
+if  not "" == "%GRADLE_EXIT_CONSOLE%" exit 1
+exit /b 1
+
+:mainEnd
+if "%OS%"=="Windows_NT" endlocal
+
+:omega
diff --git a/HttpProxy/settings.gradle b/HttpProxy/settings.gradle
new file mode 100644
index 0000000..f89ecdf
--- /dev/null
+++ b/HttpProxy/settings.gradle
@@ -0,0 +1,2 @@
+rootProject.name = 'http-proxy'
+
diff --git a/HttpProxy/src/main/kotlin/ru/hse/Acceptor.kt b/HttpProxy/src/main/kotlin/ru/hse/Acceptor.kt
new file mode 100644
index 0000000..b6ee375
--- /dev/null
+++ b/HttpProxy/src/main/kotlin/ru/hse/Acceptor.kt
@@ -0,0 +1,42 @@
+package ru.hse
+
+import java.net.ServerSocket
+import java.util.logging.Logger
+import kotlin.concurrent.thread
+
+class Acceptor(val port: Int, clientHandler: ClientHandler) {
+
+    private val listener: Thread
+    private val workers: MutableList<Thread> = ArrayList()
+
+    init {
+        listener = thread(start = false, name = "Acceptor") {
+            try {
+                val serverSocket = ServerSocket(port)
+                serverSocket.use {
+                while (!Thread.currentThread().isInterrupted) {
+                        val socket = it.accept()
+                        workers.add(clientHandler.run(socket))
+                    }
+                }
+            } catch (e: Exception) {
+                logger.severe("Closing client acceptor: ${e.message}")
+                e.printStackTrace()
+            }
+        }
+    }
+
+    fun start() {
+        listener.start()
+        logger.info("Proxy started on port $port")
+    }
+
+    fun stop() {
+        listener.interrupt()
+        workers.forEach(Thread::interrupt)
+    }
+
+    companion object {
+        val logger: Logger = Logger.getLogger(Acceptor::class.java.name)
+    }
+}
diff --git a/HttpProxy/src/main/kotlin/ru/hse/Cache.kt b/HttpProxy/src/main/kotlin/ru/hse/Cache.kt
new file mode 100644
index 0000000..54c4678
--- /dev/null
+++ b/HttpProxy/src/main/kotlin/ru/hse/Cache.kt
@@ -0,0 +1,21 @@
+package ru.hse
+
+interface Cache<K, V> {
+    fun lookUp(request: K): V?
+    fun addPage(request: K, response: V, expiration: Long = 0)
+
+    companion object {
+        fun canBeCached(headers: List<String>): Boolean {
+            val cachePolicy = headers.find { it.contains("Cache-Control") }?.split(' ')?.get(2) ?: return true
+            return !cachePolicy.contains("no-cache") && !cachePolicy.contains("no-store")
+        }
+
+        fun getExpirationTime(headers: List<String>): Long {
+            val expiration = headers.find { it.contains("Cache-Control") }?.split(' ')?.get(2) ?: return 0
+            if (expiration.contains("max-age="))
+                return expiration.split('=')[2].toLong()
+            return 0
+        }
+    }
+
+}
diff --git a/HttpProxy/src/main/kotlin/ru/hse/ClientHandler.kt b/HttpProxy/src/main/kotlin/ru/hse/ClientHandler.kt
new file mode 100644
index 0000000..ef04c4b
--- /dev/null
+++ b/HttpProxy/src/main/kotlin/ru/hse/ClientHandler.kt
@@ -0,0 +1,129 @@
+package ru.hse
+
+import java.io.BufferedReader
+import java.io.BufferedWriter
+import java.io.InputStreamReader
+import java.io.OutputStreamWriter
+import java.net.Socket
+import java.net.URL
+import java.util.logging.Logger
+import kotlin.concurrent.thread
+
+class ClientHandler(private val cache: Cache<String, String>, private val blackList: List<String>) {
+
+    fun run(clientSocket: Socket): Thread {
+        return thread {
+            val clientAddress = clientSocket.inetAddress
+            logger.info("Handling client $clientAddress")
+            try {
+                clientSocket.use {
+                    val request = extractRequestDetails(it)
+                    if (blackList.contains(request.host)) {
+                        logger.severe("Host ${request.host} is blacklisted")
+                        responseWithError(it)
+                        return@use
+                    }
+                    if (request.method == "GET") {
+                        val cached = cache.lookUp(request.host)
+                        val canCache = Cache.canBeCached(request.data.split("\n"))
+                        if (canCache && cached != null) {
+                            logger.info("Cached copy of response from ${request.host} was sent")
+                            responseWith(cached, it)
+                        } else {
+                            logger.info("Fresh HTTP response from ${request.host}")
+                            val response = retrieveResponse(request)
+                            logger.info(response)
+                            if (canCache) {
+                                cache.addPage(request.host, response)
+                            }
+                            responseWith(response, it)
+                        }
+
+                    } else {
+                        responseWith(retrieveResponse(request), it)
+                    }
+                }
+            } catch (e: Exception) {
+                logger.severe("Connection with $clientAddress interrupted: ${e.message}")
+            }
+        }
+    }
+
+    private fun retrieveResponse(request: Request): String {
+        try {
+            Socket(request.host, request.port).use {
+                val writer = BufferedWriter(OutputStreamWriter(it.outputStream))
+                writer.append(request.data)
+                writer.flush()
+                logger.info("Sent ${request.data}")
+
+                val response = extractResponse(it)
+                logger.info("Received $response")
+                return response
+            }
+        } catch (e: Exception) {
+            logger.severe("Request to ${request.host} failed: ${e.message}")
+            return ERROR_RESPONSE
+        }
+    }
+
+    private fun responseWith(response: String, socket: Socket) {
+        val writer = BufferedWriter(OutputStreamWriter(socket.outputStream))
+        writer.append(response)
+        writer.flush()
+    }
+
+    private fun responseWithError(socket: Socket) = responseWith(ERROR_RESPONSE, socket)
+
+    private fun extractRequestDetails(socket: Socket): Request {
+        val lines = readLines(socket)
+
+        val headerLine = lines[0].split(' ')
+        val url = URL(headerLine[1])
+        val protocol = url.protocol
+        val port = if (url.port == -1) 80 else url.port
+        val authB64 = lines.find { it.contains("Authorization") }?.split(' ')?.get(2)
+        return Request(
+            method = headerLine[0],
+            host = url.host,
+            port = port,
+            protocol = protocol,
+            url = url.toString(),
+            data = joinLines(lines),
+            auth = authB64
+        )
+    }
+
+    private fun extractResponse(socket: Socket): String {
+        val lines = readLines(socket, 2)
+        return joinLines(lines)
+    }
+
+    private fun readLines(socket: Socket, times: Int = 1): List<String> {
+        val lines = mutableListOf<String>()
+        val reader = BufferedReader(InputStreamReader(socket.inputStream))
+        repeat(times) {
+            do {
+                val line: String = reader.readLine() ?: return@repeat
+                lines.add(line)
+                logger.info(line)
+            } while (!line.isEmpty())
+        }
+        return lines
+    }
+
+    private fun joinLines(lines: List<String>): String {
+        return lines.joinToString(separator = SEPARATOR, postfix = SEPARATOR + SEPARATOR)
+    }
+
+    companion object {
+        const val ERROR_RESPONSE = "HTTP/1.0 200 OK\r\n" +
+                "Content-Length: 11\r\n" +
+                "\r\n" +
+                "Error\r\n" +
+                "\r\n"
+        const val SEPARATOR = "\r\n"
+
+        val logger = Logger.getLogger(ClientHandler::class.java.name)!!
+    }
+}
diff --git a/HttpProxy/src/main/kotlin/ru/hse/LruCache.kt b/HttpProxy/src/main/kotlin/ru/hse/LruCache.kt
new file mode 100644
index 0000000..477eb2a
--- /dev/null
+++ b/HttpProxy/src/main/kotlin/ru/hse/LruCache.kt
@@ -0,0 +1,49 @@
+package ru.hse
+import java.util.*
+
+/**
+ * An implementation of last recently used cache.
+ * After each access to the element the time of last access is updated.
+ * So if we want to remove an element because cache is full we remove one that was accessed last.
+ */
+class LruCache<K, V>(val expirationTime: Long = 1000, val cacheSize: Int = 1000) : Cache<K, V> {
+    private val cache = Collections.synchronizedMap(HashMap<K, PageData<V>>())
+    private val order = PriorityQueue<Expiration<K>>()
+    override fun lookUp(request: K): V? {
+        val data = cache[request] ?: return null
+        if (getTime() > data.validTill) {
+            cache.remove(request)
+            return null
+        }
+
+        val newTime = getTime()
+        synchronized(order) {
+            order.remove(Expiration(data.lookedUpTime, request))
+            order.add(Expiration(newTime, request))
+        }
+        data.lookedUpTime = newTime
+        return data.page
+    }
+
+    override fun addPage(request: K, response: V, expiration: Long) {
+        if (cache.size == cacheSize) {
+            synchronized(order) {
+                val first = order.poll()
+                cache.remove(first.key)
+            }
+        }
+        val time = getTime()
+
+        val tillTime = time + (if (expiration != 0L) expiration else this.expirationTime)
+        synchronized(order) {
+            order.add(Expiration(time, request))
+        }
+        cache[request] = PageData(response, time, tillTime)
+    }
+
+    private fun getTime(): Long = System.currentTimeMillis() / 1000
+
+    data class PageData<V>(val page: V, var lookedUpTime: Long, val validTill: Long)
+
+    data class Expiration<K>(val time: Long, val key: K)
+}
diff --git a/HttpProxy/src/main/kotlin/ru/hse/Main.kt b/HttpProxy/src/main/kotlin/ru/hse/Main.kt
new file mode 100644
index 0000000..a16ea50
--- /dev/null
+++ b/HttpProxy/src/main/kotlin/ru/hse/Main.kt
@@ -0,0 +1,6 @@
+package ru.hse
+
+fun main() {
+    val acceptor = Acceptor(3030, ClientHandler(LruCache(), listOf("google.com", "ya.ru")))
+    acceptor.start()
+}
\ No newline at end of file
diff --git a/HttpProxy/src/main/kotlin/ru/hse/Request.kt b/HttpProxy/src/main/kotlin/ru/hse/Request.kt
new file mode 100644
index 0000000..d985510
--- /dev/null
+++ b/HttpProxy/src/main/kotlin/ru/hse/Request.kt
@@ -0,0 +1,10 @@
+package ru.hse
+
+data class Request(
+    val method: String, val host: String,
+    val port: Int,
+    val protocol: String,
+    val url: String,
+    val data: String,
+    val auth: String?
+)
\ No newline at end of file