diff --git a/HW3_HttpProxy/build.gradle b/HW3_HttpProxy/build.gradle
new file mode 100644
index 0000000..8a1e4e3
--- /dev/null
+++ b/HW3_HttpProxy/build.gradle
@@ -0,0 +1,21 @@
+plugins {
+    id 'java'
+}
+
+group 'ru.sbp.hse'
+version '1.0-SNAPSHOT'
+
+sourceCompatibility = 1.8
+
+repositories {
+    mavenCentral()
+}
+
+dependencies {
+    testCompile group: 'junit', name: 'junit', version: '4.12'
+    // https://mvnrepository.com/artifact/org.jetbrains/annotations
+    compile group: 'org.jetbrains', name: 'annotations', version: '13.0'
+}
+
+apply plugin: 'application'
+applicationDefaultJvmArgs = ["-Djava.net.preferIPv4Stack=true"]
diff --git a/HW3_HttpProxy/gradle/wrapper/gradle-wrapper.jar b/HW3_HttpProxy/gradle/wrapper/gradle-wrapper.jar
new file mode 100644
index 0000000..28861d2
Binary files /dev/null and b/HW3_HttpProxy/gradle/wrapper/gradle-wrapper.jar differ
diff --git a/HW3_HttpProxy/gradle/wrapper/gradle-wrapper.properties b/HW3_HttpProxy/gradle/wrapper/gradle-wrapper.properties
new file mode 100644
index 0000000..dd3a495
--- /dev/null
+++ b/HW3_HttpProxy/gradle/wrapper/gradle-wrapper.properties
@@ -0,0 +1,6 @@
+#Tue Mar 26 16:33:18 MSK 2019
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-4.10-all.zip
diff --git a/HW3_HttpProxy/gradlew b/HW3_HttpProxy/gradlew
new file mode 100755
index 0000000..cccdd3d
--- /dev/null
+++ b/HW3_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/HW3_HttpProxy/gradlew.bat b/HW3_HttpProxy/gradlew.bat
new file mode 100644
index 0000000..e95643d
--- /dev/null
+++ b/HW3_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/HW3_HttpProxy/settings.gradle b/HW3_HttpProxy/settings.gradle
new file mode 100644
index 0000000..f89ecdf
--- /dev/null
+++ b/HW3_HttpProxy/settings.gradle
@@ -0,0 +1,2 @@
+rootProject.name = 'http-proxy'
+
diff --git a/HW3_HttpProxy/src/main/java/ru/spb/hse/httpproxy/Cache.java b/HW3_HttpProxy/src/main/java/ru/spb/hse/httpproxy/Cache.java
new file mode 100644
index 0000000..c110276
--- /dev/null
+++ b/HW3_HttpProxy/src/main/java/ru/spb/hse/httpproxy/Cache.java
@@ -0,0 +1,69 @@
+package ru.spb.hse.httpproxy;
+
+import org.jetbrains.annotations.NotNull;
+
+import java.time.Duration;
+import java.time.Instant;
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.util.logging.Logger;
+
+public class Cache {
+    private static final Logger LOGGER = Logger.getLogger("Cache");
+    private Duration expirationTime;
+    private Map<Integer, CachedObject> cache;
+
+    public Cache(Duration expirationTime, int cacheSize) {
+        this.expirationTime = expirationTime;
+        this.cache = Collections.synchronizedMap(new LinkedHashMap<Integer,
+                CachedObject>() {
+            @Override
+            public boolean removeEldestEntry(Map.Entry eldest) {
+                return size() > cacheSize;
+            }
+        });
+    }
+
+    public synchronized byte[] getResponse(@NotNull byte[] request) {
+        if (!contains(request)) {
+            return null;
+        }
+        return cache.get(Arrays.hashCode(request)).response;
+    }
+
+    public synchronized boolean contains(@NotNull byte[] request) {
+        int hash = Arrays.hashCode(request);
+        if (!cache.containsKey(hash)) {
+            LOGGER.info("The request is not in " +
+                    "cache");
+            return false;
+        }
+        if (Duration.between(cache.get(hash).wasCreated, Instant.now())
+                .compareTo(expirationTime) > 0) {
+            LOGGER.info("The request " + new String(request) + " is outdated");
+            cache.remove(hash);
+            return false;
+        }
+        return true;
+    }
+
+    public synchronized void add(@NotNull byte[] request, @NotNull byte[] response) {
+        if (contains(request)) {
+            return;
+        }
+        int hash = Arrays.hashCode(request);
+        cache.put(hash, new CachedObject(response));
+    }
+
+    private static class CachedObject {
+        private byte[] response;
+        private Instant wasCreated;
+
+        CachedObject(@NotNull byte[] response) {
+            this.response = response;
+            this.wasCreated = Instant.now();
+        }
+    }
+}
diff --git a/HW3_HttpProxy/src/main/java/ru/spb/hse/httpproxy/Main.java b/HW3_HttpProxy/src/main/java/ru/spb/hse/httpproxy/Main.java
new file mode 100644
index 0000000..da3443d
--- /dev/null
+++ b/HW3_HttpProxy/src/main/java/ru/spb/hse/httpproxy/Main.java
@@ -0,0 +1,19 @@
+package ru.spb.hse.httpproxy;
+
+import ru.spb.hse.httpproxy.parser.HTTPMessage;
+
+import java.io.IOException;
+import java.util.Arrays;
+
+public class Main {
+    public static void main(String[] args) {
+        int port = Integer.parseInt(args[0]);
+        int time = Integer.parseInt(args[1]);
+        int size = Integer.parseInt(args[2]);
+        try(ProxyServer server = new ProxyServer(port, time, size)) {
+            server.start();
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+    }
+}
diff --git a/HW3_HttpProxy/src/main/java/ru/spb/hse/httpproxy/ProxyServer.java b/HW3_HttpProxy/src/main/java/ru/spb/hse/httpproxy/ProxyServer.java
new file mode 100644
index 0000000..893932a
--- /dev/null
+++ b/HW3_HttpProxy/src/main/java/ru/spb/hse/httpproxy/ProxyServer.java
@@ -0,0 +1,94 @@
+package ru.spb.hse.httpproxy;
+
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+import ru.spb.hse.httpproxy.parser.Address;
+import ru.spb.hse.httpproxy.parser.HTTPMessage;
+import ru.spb.hse.httpproxy.parser.HTTPParser;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+import java.net.ServerSocket;
+import java.net.Socket;
+import java.time.Duration;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.logging.Logger;
+
+public class ProxyServer implements AutoCloseable {
+    private static final Logger LOGGER = Logger.getLogger("Server");
+    private ServerSocket socket;
+    private Cache cache;
+
+    public ProxyServer(int port, int expirationTimeInSec, int cacheTime)
+            throws IOException {
+        socket = new ServerSocket(port);
+        cache = new Cache(Duration.ofSeconds(expirationTimeInSec), cacheTime);
+        LOGGER.info("Server socket created");
+    }
+
+    public void start() throws IOException {
+        LOGGER.info("Start");
+        while (true) {
+            Socket clientSocket = socket.accept();
+            LOGGER.info("Accepted new client");
+            processClient(clientSocket);
+        }
+    }
+
+    private void processClient(Socket client) {
+        Thread thread = new Thread(() -> {
+            try {
+                OutputStream out = client.getOutputStream();
+                InputStream in = client.getInputStream();
+                HTTPParser parser = new HTTPParser(in);
+                HTTPMessage message = parser.getMessage();
+                byte[] request = message.getBytes();
+                LOGGER.info("Got request: " + new String(request));
+                byte[] response;
+                if (cache.contains(request)) {
+                    response = cache.getResponse(request);
+                } else {
+                    HTTPMessage responseFromHost = sendMessage(message);
+                    response = responseFromHost.getBytes();
+                    if (message.canBeCached()) {
+                        cache.add(request, response);
+                    }
+                }
+                out.write(response);
+                out.flush();
+                LOGGER.info("Send response: " + new String(response));
+            } catch (IOException e) {
+                LOGGER.warning("Exception while processing client: " + e
+                        .getMessage());
+                try {
+                    client.close();
+                } catch (IOException e1) {
+                    LOGGER.warning("Cannot close client: " + e1.getMessage());
+                }
+            }
+        });
+        thread.setDaemon(true);
+        thread.start();
+    }
+
+    @Nullable
+    private static HTTPMessage sendMessage(@NotNull HTTPMessage request)
+            throws IOException {
+        Address address = request.getAddress();
+        LOGGER.info("Host: " + address.getHost() + " port: " + address
+                .getPort());
+        try (Socket socket = new Socket(address.getHost(), address.getPort())) {
+            OutputStream outputStream = socket.getOutputStream();
+            outputStream.write(request.getBytes());
+            HTTPParser parser = new HTTPParser(socket.getInputStream());
+            return parser.getMessage();
+        }
+    }
+
+    @Override
+    public void close() throws Exception {
+        socket.close();
+    }
+}
diff --git a/HW3_HttpProxy/src/main/java/ru/spb/hse/httpproxy/parser/Address.java b/HW3_HttpProxy/src/main/java/ru/spb/hse/httpproxy/parser/Address.java
new file mode 100644
index 0000000..4ea0368
--- /dev/null
+++ b/HW3_HttpProxy/src/main/java/ru/spb/hse/httpproxy/parser/Address.java
@@ -0,0 +1,19 @@
+package ru.spb.hse.httpproxy.parser;
+
+public class Address {
+    private String host;
+    private int port;
+
+    public Address(String host, int port) {
+        this.host = host;
+        this.port = port;
+    }
+
+    public String getHost() {
+        return host;
+    }
+
+    public int getPort() {
+        return port;
+    }
+}
diff --git a/HW3_HttpProxy/src/main/java/ru/spb/hse/httpproxy/parser/HTTPMessage.java b/HW3_HttpProxy/src/main/java/ru/spb/hse/httpproxy/parser/HTTPMessage.java
new file mode 100644
index 0000000..7bd5e31
--- /dev/null
+++ b/HW3_HttpProxy/src/main/java/ru/spb/hse/httpproxy/parser/HTTPMessage.java
@@ -0,0 +1,114 @@
+package ru.spb.hse.httpproxy.parser;
+
+import com.sun.org.apache.bcel.internal.generic.NEW;
+
+import java.util.*;
+import java.util.stream.Collectors;
+
+public class HTTPMessage {
+    public static final String NEW_LINE = "\r\n";
+    public static final Set<String> SUPPORTED_METHODS = new HashSet<>(Arrays.asList("GET", "POST", "HEAD"));
+
+
+    private String requestLine;
+    private HashMap<String, String> headers;
+    private ArrayList<Byte> body;
+
+    public HTTPMessage() {
+        requestLine = "";
+        headers = new HashMap<>();
+        body = new ArrayList<>();
+    }
+
+    public void setRequestLine(String requestLine) {
+        this.requestLine = requestLine;
+    }
+
+    public void addHeaderField(String headerName, String headerValue) {
+        headers.put(headerName, headerValue);
+    }
+
+    public boolean addToBody(byte[] toAdd) {
+        for (byte b : toAdd) {
+            body.add(b);
+        }
+        if (isChunked()) {
+            byte[] finish = ("0" + NEW_LINE + NEW_LINE).getBytes();
+            if (body.size() >= finish.length) {
+                List<Byte> bodyEnd = body.subList(body.size() - finish.length, body.size());
+                boolean equal = true;
+                for (int i = 0; i < finish.length; i++) {
+                    if (finish[i] != bodyEnd.get(i)) {
+                        equal = false;
+                        break;
+                    }
+                }
+                if (equal) {
+                    body.remove(body.size() - 1);
+                    body.remove(body.size() - 1);
+                    return true;
+                } else {
+                    return false;
+                }
+            }
+        }
+        return body.size() == getBodyLength();
+    }
+
+    public Address getAddress() {
+        if (!headers.containsKey("Host")) {
+            return new Address(null, 0);
+        }
+        String[] splitted = headers.get("Host").split(":");
+        return new Address(splitted[0], splitted.length > 1 ? Integer.parseInt(splitted[1]) : 80);
+    }
+
+    public byte[] getBytes() {
+        String message = requestLine + NEW_LINE;
+        message += headers.entrySet().stream()
+                .map(entry -> entry.getKey() + ": " + entry.getValue())
+                .collect(Collectors.joining(NEW_LINE));
+        message += NEW_LINE + NEW_LINE;
+
+        ArrayList<Byte> result = new ArrayList<>();
+
+        for (byte b : message.getBytes()) {
+            result.add(b);
+        }
+
+        if (getBodyLength() > 0 || isChunked()) {
+            result.addAll(body);
+            for (byte b : NEW_LINE.getBytes()) {
+                result.add(b);
+            }
+        }
+        byte[] answer = new byte[result.size()];
+
+        for(int i = 0; i < answer.length; i++) {
+            answer[i] = result.get(i);
+        }
+        return answer;
+    }
+
+    public boolean canBeCached() {
+        if (!headers.containsKey("Cache-Control")) {
+            return true;
+        }
+        String value = headers.get("Cache-Control");
+        return !value.contains("no-cache") && !value.contains("no-store");
+    }
+
+    public boolean isSupported() {
+        String method = requestLine.split(" ")[0];
+        return SUPPORTED_METHODS.contains(method);
+    }
+
+    private boolean isChunked() {
+        return headers.getOrDefault("Transfer-Encoding", "").equals("chunked");
+    }
+
+    private int getBodyLength() {
+        return Integer.parseInt(headers.getOrDefault("Content-Length", "0"));
+    }
+
+}
diff --git a/HW3_HttpProxy/src/main/java/ru/spb/hse/httpproxy/parser/HTTPParser.java b/HW3_HttpProxy/src/main/java/ru/spb/hse/httpproxy/parser/HTTPParser.java
new file mode 100644
index 0000000..7fd8cf6
--- /dev/null
+++ b/HW3_HttpProxy/src/main/java/ru/spb/hse/httpproxy/parser/HTTPParser.java
@@ -0,0 +1,90 @@
+package ru.spb.hse.httpproxy.parser;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.List;
+
+public class HTTPParser {
+
+    private HTTPMessage message;
+    private List<Byte> head;
+
+    public HTTPParser(InputStream input) throws IOException {
+        message = new HTTPMessage();
+        head = new ArrayList<>();
+
+        byte[] buffer = new byte[1024];
+        int read = 0;
+        while ((read = input.read(buffer)) != -1) {
+            if (append(Arrays.copyOfRange(buffer, 0, read))) {
+                break;
+            }
+        }
+    }
+
+    public HTTPMessage getMessage() {
+        return message;
+    }
+
+    private boolean append(byte[] toAdd) {
+        if (head == null) {
+            return parseBody(toAdd);
+        }
+
+        for (byte b : toAdd) {
+            head.add(b);
+        }
+
+        int doubleLine = findDoubleNewLine();
+        if (doubleLine == -1) {
+            return false;
+        }
+
+        List<Byte> remain = head.subList(doubleLine + (HTTPMessage.NEW_LINE + HTTPMessage.NEW_LINE).getBytes().length, head.size());
+        head = head.subList(0, doubleLine);
+        parseHead();
+        toAdd = new byte[remain.size()];
+        for (int i = 0; i < toAdd.length; i++) {
+            toAdd[i] = remain.get(i);
+        }
+        return parseBody(toAdd);
+    }
+
+    private void parseHead() {
+        byte[] all = new byte[head.size()];
+        for (int i = 0; i < all.length; i++) {
+            all[i] = head.get(i);
+        }
+        String[] headers = new String(all).split(HTTPMessage.NEW_LINE);
+        message.setRequestLine(headers[0]);
+        for (int i = 1; i < headers.length; i++) {
+            int endOfKey = headers[i].indexOf(": ");
+            message.addHeaderField(headers[i].substring(0, endOfKey), headers[i].substring(endOfKey + 2));
+        }
+        head = null;
+    }
+
+    private boolean parseBody(byte[] toAdd) {
+        return message.addToBody(toAdd);
+    }
+
+    private int findDoubleNewLine() {
+        byte[] finish = (HTTPMessage.NEW_LINE + HTTPMessage.NEW_LINE).getBytes();
+        for (int i = 0; i <= head.size() - finish.length; i++) {
+            boolean equal = true;
+            for (int j = 0; j < finish.length; j++) {
+                if (finish[j] != head.get(i + j)) {
+                    equal = false;
+                    break;
+                }
+            }
+            if (equal) {
+                return i;
+            }
+        }
+        return -1;
+    }
+}