diff --git a/server/http/base.go b/server/http/base.go
index 4a05cb4..6b1781d 100644
--- a/server/http/base.go
+++ b/server/http/base.go
@@ -7,9 +7,15 @@ import (
 	"strings"
 )
 
-const ERR_ARGUMENT_FORMAT = "ERR wrong number of arguments for '%s' command"
+const (
+	ERR_ARGUMENT_FORMAT = "ERR wrong number of arguments for '%s' command"
+	MSG_OK              = "OK"
+)
 
-var ErrValue = errors.New("ERR value is not an integer or out of range")
+var (
+	ErrValue  = errors.New("ERR value is not an integer or out of range")
+	ErrSyntax = errors.New("ERR syntax error")
+)
 
 type commondFunc func(*ledis.DB, ...string) (interface{}, error)
 
diff --git a/server/http/cmd_hash.go b/server/http/cmd_hash.go
new file mode 100644
index 0000000..cf0955b
--- /dev/null
+++ b/server/http/cmd_hash.go
@@ -0,0 +1,306 @@
+package http
+
+import (
+	"fmt"
+	"github.com/siddontang/ledisdb/ledis"
+	"strconv"
+)
+
+func hsetCommand(db *ledis.DB, args ...string) (interface{}, error) {
+	if len(args) != 3 {
+		return nil, fmt.Errorf(ERR_ARGUMENT_FORMAT, "hset")
+	}
+
+	key := []byte(args[0])
+	field := []byte(args[1])
+	value := []byte(args[2])
+	if n, err := db.HSet(key, field, value); err != nil {
+		return nil, err
+	} else {
+		return n, err
+	}
+}
+
+func hgetCommand(db *ledis.DB, args ...string) (interface{}, error) {
+	if len(args) != 2 {
+		return nil, fmt.Errorf(ERR_ARGUMENT_FORMAT, "hget")
+	}
+
+	key := []byte(args[0])
+	field := []byte(args[1])
+
+	if v, err := db.HGet(key, field); err != nil {
+		return nil, err
+	} else {
+		if v == nil {
+			return nil, nil
+		}
+		return ledis.String(v), nil
+	}
+}
+
+func hexistsCommand(db *ledis.DB, args ...string) (interface{}, error) {
+	if len(args) != 2 {
+		return nil, fmt.Errorf(ERR_ARGUMENT_FORMAT, "hexists")
+	}
+	key := []byte(args[0])
+	field := []byte(args[1])
+
+	var n int64 = 1
+	if v, err := db.HGet(key, field); err != nil {
+		return nil, err
+	} else {
+		if v == nil {
+			n = 0
+		}
+		return n, nil
+	}
+}
+
+func hdelCommand(db *ledis.DB, args ...string) (interface{}, error) {
+	if len(args) < 2 {
+		return nil, fmt.Errorf(ERR_ARGUMENT_FORMAT, "hdel")
+	}
+	key := []byte(args[0])
+	fields := make([][]byte, len(args[1:]))
+	for i, arg := range args[1:] {
+		fields[i] = []byte(arg)
+	}
+
+	if n, err := db.HDel(key, fields...); err != nil {
+		return nil, err
+	} else {
+		return n, nil
+	}
+}
+
+func hlenCommand(db *ledis.DB, args ...string) (interface{}, error) {
+	if len(args) != 1 {
+		return nil, fmt.Errorf(ERR_ARGUMENT_FORMAT, "hlen")
+	}
+	key := []byte(args[0])
+	if n, err := db.HLen(key); err != nil {
+		return nil, err
+	} else {
+		return n, nil
+	}
+}
+
+func hincrbyCommand(db *ledis.DB, args ...string) (interface{}, error) {
+	if len(args) != 3 {
+		return nil, fmt.Errorf(ERR_ARGUMENT_FORMAT, "hincrby")
+	}
+	key := []byte(args[0])
+	field := []byte(args[1])
+	delta, err := strconv.ParseInt(args[2], 10, 64)
+	if err != nil {
+		return nil, ErrValue
+	}
+
+	var n int64
+	if n, err = db.HIncrBy(key, field, delta); err != nil {
+		return nil, err
+	} else {
+		return n, nil
+	}
+}
+
+func hmsetCommand(db *ledis.DB, args ...string) (interface{}, error) {
+	if len(args) < 3 {
+		return nil, fmt.Errorf(ERR_ARGUMENT_FORMAT, "hmset")
+	}
+
+	if len(args[1:])%2 != 0 {
+		return nil, fmt.Errorf(ERR_ARGUMENT_FORMAT, "hmset")
+	}
+	key := []byte(args[0])
+	args = args[1:]
+	kvs := make([]ledis.FVPair, len(args)/2)
+	for i := 0; i < len(kvs); i++ {
+		kvs[i].Field = []byte(args[2*i])
+		kvs[i].Value = []byte(args[2*i+1])
+	}
+	if err := db.HMset(key, kvs...); err != nil {
+		return nil, err
+	} else {
+		return []interface{}{true, MSG_OK}, nil
+	}
+}
+
+func hmgetCommand(db *ledis.DB, args ...string) (interface{}, error) {
+	if len(args) < 2 {
+		return nil, fmt.Errorf(ERR_ARGUMENT_FORMAT, "hmget")
+	}
+	key := []byte(args[0])
+	fields := make([][]byte, len(args[1:]))
+	for i, arg := range args[1:] {
+		fields[i] = []byte(arg)
+	}
+	if vals, err := db.HMget(key, fields...); err != nil {
+		return nil, err
+	} else {
+		arr := make([]interface{}, len(vals))
+		for i, v := range vals {
+			if v == nil {
+				arr[i] = nil
+			} else {
+				arr[i] = ledis.String(v)
+			}
+		}
+		return arr, nil
+	}
+}
+
+func hgetallCommand(db *ledis.DB, args ...string) (interface{}, error) {
+	if len(args) != 1 {
+		return nil, fmt.Errorf(ERR_ARGUMENT_FORMAT, "hgetall")
+	}
+	key := []byte(args[0])
+	if fvs, err := db.HGetAll(key); err != nil {
+		return nil, err
+	} else {
+		var m = make(map[string]string)
+		for _, fv := range fvs {
+			m[ledis.String(fv.Field)] = ledis.String(fv.Value)
+		}
+		return m, nil
+	}
+}
+
+func hkeysCommand(db *ledis.DB, args ...string) (interface{}, error) {
+	if len(args) != 1 {
+		return nil, fmt.Errorf(ERR_ARGUMENT_FORMAT, "hkeys")
+	}
+	key := []byte(args[0])
+	if v, err := db.HKeys(key); err != nil {
+		return nil, err
+	} else {
+		return v, nil
+	}
+}
+
+func hvalsCommand(db *ledis.DB, args ...string) (interface{}, error) {
+	if len(args) != 1 {
+		return nil, fmt.Errorf(ERR_ARGUMENT_FORMAT, "hvals")
+	}
+	key := []byte(args[0])
+	if vals, err := db.HValues(key); err != nil {
+		return nil, err
+	} else {
+		var arr = make([]string, len(vals))
+		for i, v := range vals {
+			arr[i] = ledis.String(v)
+		}
+		return arr, nil
+	}
+}
+
+func hclearCommand(db *ledis.DB, args ...string) (interface{}, error) {
+	if len(args) != 1 {
+		return nil, fmt.Errorf(ERR_ARGUMENT_FORMAT, "hclear")
+	}
+	key := []byte(args[0])
+	if n, err := db.HClear(key); err != nil {
+		return nil, err
+	} else {
+		return n, nil
+	}
+}
+
+func hmclearCommand(db *ledis.DB, args ...string) (interface{}, error) {
+	if len(args) < 1 {
+		return nil, fmt.Errorf(ERR_ARGUMENT_FORMAT, "hmclear")
+	}
+	keys := make([][]byte, len(args))
+	for i, arg := range args {
+		keys[i] = []byte(arg)
+	}
+
+	if n, err := db.HMclear(keys...); err != nil {
+		return nil, err
+	} else {
+		return n, nil
+	}
+}
+
+func hexpireCommand(db *ledis.DB, args ...string) (interface{}, error) {
+	if len(args) != 2 {
+		return nil, fmt.Errorf(ERR_ARGUMENT_FORMAT, "hexpire")
+	}
+	key := []byte(args[0])
+	duration, err := strconv.ParseInt(args[1], 10, 64)
+	if err != nil {
+		return nil, ErrValue
+	}
+	if v, err := db.HExpire(key, duration); err != nil {
+		return nil, err
+	} else {
+		return v, nil
+	}
+}
+
+func hexpireAtCommand(db *ledis.DB, args ...string) (interface{}, error) {
+	if len(args) != 2 {
+		return nil, fmt.Errorf(ERR_ARGUMENT_FORMAT, "hexpireat")
+	}
+	key := []byte(args[0])
+
+	when, err := strconv.ParseInt(args[1], 10, 64)
+	if err != nil {
+		return nil, ErrValue
+	}
+
+	if v, err := db.HExpireAt(key, when); err != nil {
+		return nil, err
+	} else {
+		return v, nil
+	}
+}
+
+func httlCommand(db *ledis.DB, args ...string) (interface{}, error) {
+	if len(args) != 1 {
+		return nil, fmt.Errorf(ERR_ARGUMENT_FORMAT, "httl")
+	}
+
+	key := []byte(args[0])
+	if v, err := db.HTTL(key); err != nil {
+		return nil, err
+	} else {
+		return v, nil
+	}
+}
+
+func hpersistCommand(db *ledis.DB, args ...string) (interface{}, error) {
+	if len(args) != 1 {
+		return nil, fmt.Errorf(ERR_ARGUMENT_FORMAT, "hpersist")
+	}
+	key := []byte(args[0])
+	if n, err := db.HPersist(key); err != nil {
+		return nil, err
+	} else {
+		return n, err
+	}
+}
+
+func init() {
+	register("hdel", hdelCommand)
+	register("hexists", hexistsCommand)
+	register("hget", hgetCommand)
+	register("hgetall", hgetallCommand)
+	register("hincrby", hincrbyCommand)
+	register("hkeys", hkeysCommand)
+	register("hlen", hlenCommand)
+	register("hmget", hmgetCommand)
+	register("hmset", hmsetCommand)
+	register("hset", hsetCommand)
+	register("hvals", hvalsCommand)
+
+	//ledisdb special command
+
+	register("hclear", hclearCommand)
+	register("hmclear", hmclearCommand)
+	register("hexpire", hexpireCommand)
+	register("hexpireat", hexpireAtCommand)
+	register("httl", httlCommand)
+	register("hpersist", hpersistCommand)
+}
diff --git a/server/http/cmd_kv.go b/server/http/cmd_kv.go
new file mode 100644
index 0000000..dbd1116
--- /dev/null
+++ b/server/http/cmd_kv.go
@@ -0,0 +1,278 @@
+package http
+
+import (
+	"fmt"
+	"github.com/siddontang/ledisdb/ledis"
+	"strconv"
+)
+
+func getCommand(db *ledis.DB, args ...string) (interface{}, error) {
+	if len(args) != 1 {
+		return nil, fmt.Errorf(ERR_ARGUMENT_FORMAT, "get")
+	}
+	key := []byte(args[0])
+	if v, err := db.Get(key); err != nil {
+		return nil, err
+	} else {
+		if v == nil {
+			return nil, nil
+		}
+		return ledis.String(v), nil
+	}
+}
+
+func setCommand(db *ledis.DB, args ...string) (interface{}, error) {
+	if len(args) != 2 {
+		return nil, fmt.Errorf(ERR_ARGUMENT_FORMAT, "set")
+	}
+
+	key := []byte(args[0])
+	val := []byte(args[1])
+	if err := db.Set(key, val); err != nil {
+		return nil, err
+	} else {
+		return []interface{}{true, MSG_OK}, nil
+	}
+
+}
+
+func getsetCommand(db *ledis.DB, args ...string) (interface{}, error) {
+	if len(args) != 2 {
+		return nil, fmt.Errorf(ERR_ARGUMENT_FORMAT, "getset")
+	}
+
+	key := []byte(args[0])
+	val := []byte(args[1])
+	if v, err := db.GetSet(key, val); err != nil {
+		return nil, err
+	} else {
+		if v == nil {
+			return nil, nil
+		}
+		return ledis.String(v), nil
+	}
+}
+
+func setnxCommand(db *ledis.DB, args ...string) (interface{}, error) {
+	if len(args) != 2 {
+		return nil, fmt.Errorf(ERR_ARGUMENT_FORMAT, "setnx")
+	}
+
+	key := []byte(args[0])
+	val := []byte(args[1])
+	if n, err := db.SetNX(key, val); err != nil {
+		return nil, err
+	} else {
+		return n, nil
+	}
+}
+
+func existsCommand(db *ledis.DB, args ...string) (interface{}, error) {
+	if len(args) != 1 {
+		return nil, fmt.Errorf(ERR_ARGUMENT_FORMAT, "exists")
+	}
+
+	if n, err := db.Exists([]byte(args[0])); err != nil {
+		return nil, err
+	} else {
+		return n, nil
+	}
+}
+
+func incrCommand(db *ledis.DB, args ...string) (interface{}, error) {
+	if len(args) != 1 {
+		return nil, fmt.Errorf(ERR_ARGUMENT_FORMAT, "incr")
+	}
+
+	key := []byte(args[0])
+	if n, err := db.Incr(key); err != nil {
+		return nil, err
+	} else {
+		return n, nil
+	}
+}
+
+func decrCommand(db *ledis.DB, args ...string) (interface{}, error) {
+	if len(args) != 1 {
+		return nil, fmt.Errorf(ERR_ARGUMENT_FORMAT, "decr")
+	}
+
+	key := []byte(args[0])
+	if n, err := db.Decr(key); err != nil {
+		return nil, err
+	} else {
+		return n, nil
+	}
+}
+
+func incrbyCommand(db *ledis.DB, args ...string) (interface{}, error) {
+	if len(args) != 2 {
+		return nil, fmt.Errorf(ERR_ARGUMENT_FORMAT, "incrby")
+	}
+
+	delta, err := strconv.ParseInt(args[1], 10, 64)
+	if err != nil {
+		return nil, ErrValue
+	}
+
+	key := []byte(args[0])
+
+	if n, err := db.IncryBy(key, delta); err != nil {
+		return nil, err
+	} else {
+		return n, nil
+	}
+}
+
+func decrbyCommand(db *ledis.DB, args ...string) (interface{}, error) {
+	if len(args) != 2 {
+		return nil, fmt.Errorf(ERR_ARGUMENT_FORMAT, "decrby")
+	}
+
+	delta, err := strconv.ParseInt(args[1], 10, 64)
+	if err != nil {
+		return nil, ErrValue
+	}
+
+	key := []byte(args[0])
+
+	if n, err := db.DecrBy(key, delta); err != nil {
+		return nil, err
+	} else {
+		return n, nil
+	}
+}
+
+func delCommand(db *ledis.DB, args ...string) (interface{}, error) {
+	if len(args) == 0 {
+		return nil, fmt.Errorf(ERR_ARGUMENT_FORMAT, "del")
+	}
+
+	keys := make([][]byte, len(args))
+	if n, err := db.Del(keys...); err != nil {
+		return nil, err
+	} else {
+		return n, nil
+	}
+}
+
+func msetCommand(db *ledis.DB, args ...string) (interface{}, error) {
+	if len(args) == 0 || len(args)%2 != 0 {
+		return nil, fmt.Errorf(ERR_ARGUMENT_FORMAT, "mset")
+	}
+
+	kvs := make([]ledis.KVPair, len(args)/2)
+	for i := 0; i < len(kvs); i++ {
+		kvs[i].Key = []byte(args[2*i])
+		kvs[i].Value = []byte(args[2*i+1])
+	}
+
+	if err := db.MSet(kvs...); err != nil {
+		return nil, err
+	} else {
+		return []interface{}{true, MSG_OK}, nil
+	}
+}
+
+func mgetCommand(db *ledis.DB, args ...string) (interface{}, error) {
+	if len(args) == 0 {
+		return nil, fmt.Errorf(ERR_ARGUMENT_FORMAT, "mget")
+	}
+
+	keys := make([][]byte, len(args))
+	for i, arg := range args {
+		keys[i] = []byte(arg)
+	}
+	if vals, err := db.MGet(keys...); err != nil {
+		return nil, err
+	} else {
+		arr := make([]interface{}, len(vals))
+		for i, v := range vals {
+			if v == nil {
+				arr[i] = nil
+			} else {
+				arr[i] = ledis.String(v)
+			}
+		}
+		return arr, nil
+	}
+}
+
+func expireCommand(db *ledis.DB, args ...string) (interface{}, error) {
+	if len(args) != 2 {
+		return nil, fmt.Errorf(ERR_ARGUMENT_FORMAT, "expire")
+	}
+
+	duration, err := strconv.ParseInt(args[1], 10, 64)
+	if err != nil {
+		return nil, ErrValue
+	}
+	key := []byte(args[0])
+	if v, err := db.Expire(key, duration); err != nil {
+		return nil, err
+	} else {
+		return v, nil
+	}
+}
+
+func expireAtCommand(db *ledis.DB, args ...string) (interface{}, error) {
+	if len(args) != 2 {
+		return nil, fmt.Errorf(ERR_ARGUMENT_FORMAT, "expireat")
+	}
+
+	when, err := strconv.ParseInt(args[1], 10, 64)
+	if err != nil {
+		return nil, ErrValue
+	}
+	key := []byte(args[0])
+	if v, err := db.ExpireAt(key, when); err != nil {
+		return nil, err
+	} else {
+		return v, nil
+	}
+}
+
+func ttlCommand(db *ledis.DB, args ...string) (interface{}, error) {
+	if len(args) != 1 {
+		return nil, fmt.Errorf(ERR_ARGUMENT_FORMAT, "ttl")
+	}
+	key := []byte(args[0])
+
+	if v, err := db.TTL(key); err != nil {
+		return nil, err
+	} else {
+		return v, nil
+	}
+}
+
+func persistCommand(db *ledis.DB, args ...string) (interface{}, error) {
+	if len(args) != 1 {
+		return nil, fmt.Errorf(ERR_ARGUMENT_FORMAT, "persist")
+	}
+	key := []byte(args[0])
+
+	if n, err := db.Persist(key); err != nil {
+		return nil, err
+	} else {
+		return n, nil
+	}
+}
+
+func init() {
+	register("decr", decrCommand)
+	register("decrby", decrbyCommand)
+	register("del", delCommand)
+	register("exists", existsCommand)
+	register("get", getCommand)
+	register("getset", getsetCommand)
+	register("incr", incrCommand)
+	register("incrby", incrbyCommand)
+	register("mget", mgetCommand)
+	register("mset", msetCommand)
+	register("set", setCommand)
+	register("setnx", setnxCommand)
+	register("expire", expireCommand)
+	register("expireat", expireAtCommand)
+	register("ttl", ttlCommand)
+	register("persist", persistCommand)
+}
diff --git a/server/http/cmd_list.go b/server/http/cmd_list.go
new file mode 100644
index 0000000..3f83b8e
--- /dev/null
+++ b/server/http/cmd_list.go
@@ -0,0 +1,248 @@
+package http
+
+import (
+	"fmt"
+	"github.com/siddontang/ledisdb/ledis"
+	"strconv"
+)
+
+func lpushCommand(db *ledis.DB, args ...string) (interface{}, error) {
+	if len(args) < 2 {
+		return nil, fmt.Errorf(ERR_ARGUMENT_FORMAT, "lpush")
+	}
+	key := []byte(args[0])
+	elems := make([][]byte, len(args[1:]))
+	for i, arg := range args[1:] {
+		elems[i] = []byte(arg)
+	}
+
+	if n, err := db.LPush(key, elems...); err != nil {
+		return nil, err
+	} else {
+		return n, nil
+	}
+}
+
+func rpushCommand(db *ledis.DB, args ...string) (interface{}, error) {
+	if len(args) < 2 {
+		return nil, fmt.Errorf(ERR_ARGUMENT_FORMAT, "rpush")
+	}
+
+	key := []byte(args[0])
+	elems := make([][]byte, len(args[1:]))
+	for i, arg := range args[1:] {
+		elems[i] = []byte(arg)
+	}
+	if n, err := db.RPush(key, elems...); err != nil {
+		return nil, err
+	} else {
+		return n, nil
+	}
+}
+
+func lpopCommand(db *ledis.DB, args ...string) (interface{}, error) {
+	if len(args) != 1 {
+		return nil, fmt.Errorf(ERR_ARGUMENT_FORMAT, "lpop")
+	}
+
+	key := []byte(args[0])
+
+	if v, err := db.LPop(key); err != nil {
+		return nil, err
+	} else {
+		if v == nil {
+			return nil, nil
+		}
+		return ledis.String(v), nil
+	}
+}
+
+func rpopCommand(db *ledis.DB, args ...string) (interface{}, error) {
+	if len(args) != 1 {
+		return nil, fmt.Errorf(ERR_ARGUMENT_FORMAT, "rpop")
+	}
+	key := []byte(args[0])
+
+	if v, err := db.RPop(key); err != nil {
+		return nil, err
+	} else {
+		if v == nil {
+			return nil, nil
+		}
+		return ledis.String(v), nil
+	}
+}
+
+func llenCommand(db *ledis.DB, args ...string) (interface{}, error) {
+	if len(args) != 1 {
+		return nil, fmt.Errorf(ERR_ARGUMENT_FORMAT, "llen")
+	}
+
+	key := []byte(args[0])
+	if n, err := db.LLen(key); err != nil {
+		return nil, err
+	} else {
+		return n, nil
+	}
+}
+
+func lindexCommand(db *ledis.DB, args ...string) (interface{}, error) {
+	if len(args) != 2 {
+		return nil, fmt.Errorf(ERR_ARGUMENT_FORMAT, "lindex")
+	}
+
+	index, err := strconv.ParseInt(args[1], 10, 32)
+	if err != nil {
+		return nil, ErrValue
+	}
+	key := []byte(args[0])
+
+	if v, err := db.LIndex(key, int32(index)); err != nil {
+		return nil, err
+	} else {
+		if v == nil {
+			return nil, nil
+		}
+		return ledis.String(v), nil
+	}
+}
+
+func lrangeCommand(db *ledis.DB, args ...string) (interface{}, error) {
+	if len(args) != 3 {
+		return nil, fmt.Errorf(ERR_ARGUMENT_FORMAT, "lrange")
+	}
+
+	start, err := strconv.ParseInt(args[1], 10, 64)
+	if err != nil {
+		return nil, ErrValue
+	}
+
+	stop, err := strconv.ParseInt(args[2], 10, 64)
+	if err != nil {
+		return nil, ErrValue
+	}
+
+	key := []byte(args[0])
+	if vals, err := db.LRange(key, int32(start), int32(stop)); err != nil {
+		return nil, err
+	} else {
+		arr := make([]interface{}, len(vals))
+		for i, v := range vals {
+			if v == nil {
+				arr[i] = nil
+			} else {
+				arr[i] = ledis.String(v)
+			}
+		}
+		return arr, nil
+	}
+}
+
+func lclearCommand(db *ledis.DB, args ...string) (interface{}, error) {
+	if len(args) != 1 {
+		return nil, fmt.Errorf(ERR_ARGUMENT_FORMAT, "lclear")
+	}
+
+	key := []byte(args[0])
+	if n, err := db.LClear(key); err != nil {
+		return nil, err
+	} else {
+		return n, nil
+	}
+}
+
+func lmclearCommand(db *ledis.DB, args ...string) (interface{}, error) {
+	if len(args) < 1 {
+		return nil, fmt.Errorf(ERR_ARGUMENT_FORMAT, "lmclear")
+	}
+
+	keys := make([][]byte, len(args))
+	for i, arg := range args {
+		keys[i] = []byte(arg)
+	}
+	if n, err := db.LMclear(keys...); err != nil {
+		return nil, err
+	} else {
+		return n, nil
+	}
+}
+
+func lexpireCommand(db *ledis.DB, args ...string) (interface{}, error) {
+	if len(args) != 2 {
+		return nil, fmt.Errorf(ERR_ARGUMENT_FORMAT, "lexpire")
+	}
+
+	duration, err := strconv.ParseInt(args[1], 10, 64)
+	if err != nil {
+		return nil, ErrValue
+	}
+
+	key := []byte(args[0])
+	if v, err := db.LExpire(key, duration); err != nil {
+		return nil, err
+	} else {
+		return v, nil
+	}
+}
+
+func lexpireAtCommand(db *ledis.DB, args ...string) (interface{}, error) {
+	if len(args) != 2 {
+		return nil, fmt.Errorf(ERR_ARGUMENT_FORMAT, "lexpireat")
+	}
+
+	when, err := strconv.ParseInt(args[1], 10, 64)
+	if err != nil {
+		return nil, ErrValue
+	}
+
+	key := []byte(args[0])
+	if v, err := db.LExpireAt(key, when); err != nil {
+		return nil, err
+	} else {
+		return v, nil
+	}
+}
+
+func lttlCommand(db *ledis.DB, args ...string) (interface{}, error) {
+	if len(args) != 1 {
+		return nil, fmt.Errorf(ERR_ARGUMENT_FORMAT, "lttl")
+	}
+
+	key := []byte(args[0])
+	if v, err := db.LTTL(key); err != nil {
+		return nil, err
+	} else {
+		return v, nil
+	}
+}
+
+func lpersistCommand(db *ledis.DB, args ...string) (interface{}, error) {
+	if len(args) != 1 {
+		return nil, fmt.Errorf(ERR_ARGUMENT_FORMAT, "lpersist")
+	}
+	key := []byte(args[0])
+	if n, err := db.LPersist(key); err != nil {
+		return nil, err
+	} else {
+		return n, nil
+	}
+}
+
+func init() {
+	register("lindex", lindexCommand)
+	register("llen", llenCommand)
+	register("lpop", lpopCommand)
+	register("lrange", lrangeCommand)
+	register("lpush", lpushCommand)
+	register("rpop", rpopCommand)
+	register("rpush", rpushCommand)
+
+	//ledisdb special command
+
+	register("lclear", lclearCommand)
+	register("lmclear", lmclearCommand)
+	register("lexpire", lexpireCommand)
+	register("lexpireat", lexpireAtCommand)
+	register("lttl", lttlCommand)
+	register("lpersist", lpersistCommand)
+}
diff --git a/server/http/cmd_zset.go b/server/http/cmd_zset.go
new file mode 100644
index 0000000..f1ed15e
--- /dev/null
+++ b/server/http/cmd_zset.go
@@ -0,0 +1,520 @@
+package http
+
+import (
+	"errors"
+	"fmt"
+	"github.com/siddontang/ledisdb/ledis"
+	"math"
+	"strconv"
+	"strings"
+)
+
+var errScoreOverflow = errors.New("zset score overflow")
+
+func zaddCommand(db *ledis.DB, args ...string) (interface{}, error) {
+	if len(args) < 3 {
+		return nil, fmt.Errorf(ERR_ARGUMENT_FORMAT, "zadd")
+	}
+
+	if len(args[1:])%2 != 0 {
+		return nil, fmt.Errorf(ERR_ARGUMENT_FORMAT, "zadd")
+	}
+
+	key := []byte(args[0])
+	args = args[1:]
+
+	params := make([]ledis.ScorePair, len(args)/2)
+	for i := 0; i < len(params); i++ {
+		score, err := strconv.ParseInt(args[2*i], 10, 64)
+		if err != nil {
+			return nil, ErrValue
+		}
+
+		params[i].Score = score
+		params[i].Member = []byte(args[2*i+1])
+	}
+
+	if n, err := db.ZAdd(key, params...); err != nil {
+		return nil, err
+	} else {
+		return n, nil
+	}
+}
+
+func zcardCommand(db *ledis.DB, args ...string) (interface{}, error) {
+	if len(args) != 1 {
+		return nil, fmt.Errorf(ERR_ARGUMENT_FORMAT, "zcard")
+	}
+
+	key := []byte(args[0])
+	if n, err := db.ZCard(key); err != nil {
+		return nil, err
+	} else {
+		return n, nil
+	}
+}
+
+func zscoreCommand(db *ledis.DB, args ...string) (interface{}, error) {
+	if len(args) != 2 {
+		return nil, fmt.Errorf(ERR_ARGUMENT_FORMAT, "zscore")
+	}
+
+	key := []byte(args[0])
+	member := []byte(args[1])
+
+	if s, err := db.ZScore(key, member); err != nil {
+		if err == ledis.ErrScoreMiss {
+			return nil, nil
+		} else {
+			return nil, err
+		}
+	} else {
+		return strconv.FormatInt(s, 10), nil
+	}
+}
+
+func zremCommand(db *ledis.DB, args ...string) (interface{}, error) {
+	if len(args) < 2 {
+		return nil, fmt.Errorf(ERR_ARGUMENT_FORMAT, "zrem")
+	}
+
+	key := []byte(args[0])
+	members := make([][]byte, len(args[1:]))
+	for i, arg := range args[1:] {
+		members[i] = []byte(arg)
+	}
+	if n, err := db.ZRem(key, members...); err != nil {
+		return nil, err
+	} else {
+		return n, nil
+	}
+}
+
+func zincrbyCommand(db *ledis.DB, args ...string) (interface{}, error) {
+	if len(args) != 3 {
+		return nil, fmt.Errorf(ERR_ARGUMENT_FORMAT, "zincrby")
+	}
+
+	key := []byte(args[0])
+
+	delta, err := strconv.ParseInt(args[1], 10, 64)
+	if err != nil {
+		return nil, ErrValue
+	}
+
+	member := []byte(args[2])
+	if v, err := db.ZIncrBy(key, delta, member); err != nil {
+		return nil, err
+	} else {
+		return strconv.FormatInt(v, 10), nil
+	}
+}
+
+func zparseScoreRange(minBuf string, maxBuf string) (min int64, max int64, err error) {
+	if strings.ToLower(minBuf) == "-inf" {
+		min = math.MinInt64
+	} else {
+		var lopen bool = false
+
+		if len(minBuf) == 0 {
+			err = ErrValue
+			return
+		}
+
+		if minBuf[0] == '(' {
+			lopen = true
+			minBuf = minBuf[1:]
+		}
+
+		min, err = strconv.ParseInt(minBuf, 10, 64)
+		if err != nil {
+			err = ErrValue
+			return
+		}
+
+		if min <= ledis.MinScore || min >= ledis.MaxScore {
+			err = errScoreOverflow
+			return
+		}
+
+		if lopen {
+			min++
+		}
+	}
+
+	if strings.ToLower(maxBuf) == "+inf" {
+		max = math.MaxInt64
+	} else {
+		var ropen = false
+
+		if len(maxBuf) == 0 {
+			err = ErrValue
+			return
+		}
+
+		if maxBuf[0] == '(' {
+			ropen = true
+			maxBuf = maxBuf[1:]
+		}
+
+		max, err = strconv.ParseInt(maxBuf, 10, 64)
+		if err != nil {
+			err = ErrValue
+			return
+		}
+
+		if max <= ledis.MinScore || max >= ledis.MaxScore {
+			err = errScoreOverflow
+			return
+		}
+
+		if ropen {
+			max--
+		}
+	}
+	return
+}
+
+func zcountCommand(db *ledis.DB, args ...string) (interface{}, error) {
+	if len(args) != 3 {
+		return nil, fmt.Errorf(ERR_ARGUMENT_FORMAT, "zcount")
+	}
+
+	min, max, err := zparseScoreRange(args[1], args[2])
+	if err != nil {
+		return nil, err
+	}
+
+	if min > max {
+		return 0, nil
+	}
+
+	key := []byte(args[0])
+	if n, err := db.ZCount(key, min, max); err != nil {
+		return nil, err
+	} else {
+		return n, nil
+	}
+}
+
+func zrankCommand(db *ledis.DB, args ...string) (interface{}, error) {
+	if len(args) != 2 {
+		return nil, fmt.Errorf(ERR_ARGUMENT_FORMAT, "zrank")
+	}
+	key := []byte(args[0])
+	member := []byte(args[1])
+
+	if n, err := db.ZRank(key, member); err != nil {
+		return nil, err
+	} else if n == -1 {
+		return nil, nil
+	} else {
+		return n, nil
+	}
+}
+
+func zrevrankCommand(db *ledis.DB, args ...string) (interface{}, error) {
+	if len(args) != 2 {
+		return nil, fmt.Errorf(ERR_ARGUMENT_FORMAT, "zrevrank")
+	}
+
+	key := []byte(args[0])
+	member := []byte(args[1])
+	if n, err := db.ZRevRank(key, member); err != nil {
+		return nil, err
+	} else if n == -1 {
+		return nil, nil
+	} else {
+		return n, nil
+	}
+}
+
+func zremrangebyrankCommand(db *ledis.DB, args ...string) (interface{}, error) {
+	if len(args) != 3 {
+		return nil, fmt.Errorf(ERR_ARGUMENT_FORMAT, "zremrangebyrank")
+	}
+
+	key := []byte(args[0])
+
+	start, err := strconv.Atoi(args[1])
+	if err != nil {
+		return nil, ErrValue
+	}
+	stop, err := strconv.Atoi(args[2])
+
+	if err != nil {
+		return nil, ErrValue
+	}
+
+	if n, err := db.ZRemRangeByRank(key, start, stop); err != nil {
+		return nil, err
+	} else {
+		return n, nil
+	}
+}
+
+func zremrangebyscoreCommand(db *ledis.DB, args ...string) (interface{}, error) {
+	if len(args) != 3 {
+		return nil, fmt.Errorf(ERR_ARGUMENT_FORMAT, "zremrangebyscore")
+	}
+
+	key := []byte(args[0])
+	min, max, err := zparseScoreRange(args[1], args[2])
+	if err != nil {
+		return nil, err
+	}
+
+	if n, err := db.ZRemRangeByScore(key, min, max); err != nil {
+		return nil, err
+	} else {
+		return n, nil
+	}
+}
+
+func zrangeGeneric(db *ledis.DB, reverse bool, args ...string) (interface{}, error) {
+
+	key := []byte(args[0])
+
+	start, err := strconv.Atoi(args[1])
+	if err != nil {
+		return nil, ErrValue
+	}
+
+	stop, err := strconv.Atoi(args[2])
+	if err != nil {
+		return nil, ErrValue
+	}
+
+	args = args[3:]
+	var withScores bool = false
+
+	if len(args) > 0 && strings.ToLower(args[0]) == "withscores" {
+		withScores = true
+	}
+
+	if datas, err := db.ZRangeGeneric(key, start, stop, reverse); err != nil {
+		return nil, err
+	} else {
+		return makeScorePairArray(datas, withScores), nil
+	}
+}
+
+func makeScorePairArray(datas []ledis.ScorePair, withScores bool) []string {
+	var arr []string
+	if withScores {
+		arr = make([]string, 2*len(datas))
+		for i, data := range datas {
+			arr[2*i] = ledis.String(data.Member)
+			arr[2*i+1] = strconv.FormatInt(data.Score, 10)
+		}
+	} else {
+		arr = make([]string, len(datas))
+		for i, data := range datas {
+			arr[i] = ledis.String(data.Member)
+		}
+	}
+	return arr
+}
+
+func zrangeCommand(db *ledis.DB, args ...string) (interface{}, error) {
+	if len(args) < 3 {
+		return nil, fmt.Errorf(ERR_ARGUMENT_FORMAT, "zrange")
+	}
+	return zrangeGeneric(db, false, args...)
+}
+
+func zrevrangeCommand(db *ledis.DB, args ...string) (interface{}, error) {
+	if len(args) < 3 {
+		return nil, fmt.Errorf(ERR_ARGUMENT_FORMAT, "zrevrange")
+	}
+	return zrangeGeneric(db, true, args...)
+}
+
+func zrangebyscoreGeneric(db *ledis.DB, reverse bool, args ...string) (interface{}, error) {
+	key := []byte(args[0])
+
+	var minScore, maxScore string
+
+	if !reverse {
+		minScore, maxScore = args[1], args[2]
+	} else {
+		minScore, maxScore = args[2], args[1]
+	}
+
+	min, max, err := zparseScoreRange(minScore, maxScore)
+
+	if err != nil {
+		return nil, err
+	}
+
+	args = args[3:]
+
+	var withScores bool = false
+
+	if len(args) > 0 && strings.ToLower(args[0]) == "withscores" {
+		withScores = true
+		args = args[1:]
+	}
+
+	var offset int = 0
+	var count int = -1
+
+	if len(args) > 0 {
+		if len(args) != 3 {
+			return nil, ErrSyntax
+		}
+
+		if strings.ToLower(args[0]) != "limit" {
+			return nil, ErrSyntax
+		}
+
+		if offset, err = strconv.Atoi(args[1]); err != nil {
+			return nil, ErrValue
+		}
+
+		if count, err = strconv.Atoi(args[2]); err != nil {
+			return nil, ErrValue
+		}
+	}
+
+	if offset < 0 {
+		return []interface{}{}, nil
+	}
+
+	if datas, err := db.ZRangeByScoreGeneric(key, min, max, offset, count, reverse); err != nil {
+		return nil, err
+	} else {
+		return makeScorePairArray(datas, withScores), nil
+	}
+}
+
+func zrangebyscoreCommand(db *ledis.DB, args ...string) (interface{}, error) {
+	if len(args) < 3 {
+		return nil, fmt.Errorf(ERR_ARGUMENT_FORMAT, "zrangebyscore")
+	}
+	return zrangebyscoreGeneric(db, false, args...)
+}
+
+func zrevrangebyscoreCommand(db *ledis.DB, args ...string) (interface{}, error) {
+	if len(args) < 3 {
+		return nil, fmt.Errorf(ERR_ARGUMENT_FORMAT, "zrevrangebyscore")
+	}
+	return zrangebyscoreGeneric(db, true, args...)
+}
+
+func zclearCommand(db *ledis.DB, args ...string) (interface{}, error) {
+	if len(args) != 1 {
+		return nil, fmt.Errorf(ERR_ARGUMENT_FORMAT, "zclear")
+	}
+
+	key := []byte(args[0])
+	if n, err := db.ZClear(key); err != nil {
+		return nil, err
+	} else {
+		return n, nil
+	}
+}
+
+func zmclearCommand(db *ledis.DB, args ...string) (interface{}, error) {
+	if len(args) < 1 {
+		return nil, fmt.Errorf(ERR_ARGUMENT_FORMAT, "zmclear")
+	}
+
+	keys := make([][]byte, len(args))
+	for i, arg := range args {
+		keys[i] = []byte(arg)
+	}
+	if n, err := db.ZMclear(keys...); err != nil {
+		return nil, err
+	} else {
+		return n, nil
+	}
+}
+
+func zexpireCommand(db *ledis.DB, args ...string) (interface{}, error) {
+	if len(args) != 2 {
+		return nil, fmt.Errorf(ERR_ARGUMENT_FORMAT, "zexpire")
+	}
+
+	duration, err := strconv.ParseInt(args[1], 10, 64)
+	if err != nil {
+		return nil, ErrValue
+	}
+
+	key := []byte(args[0])
+	if v, err := db.ZExpire(key, duration); err != nil {
+		return nil, err
+	} else {
+		return v, nil
+	}
+}
+
+func zexpireAtCommand(db *ledis.DB, args ...string) (interface{}, error) {
+	if len(args) != 2 {
+		return nil, fmt.Errorf(ERR_ARGUMENT_FORMAT, "zexpireat")
+	}
+
+	when, err := strconv.ParseInt(args[1], 10, 64)
+	if err != nil {
+		return nil, ErrValue
+	}
+
+	key := []byte(args[0])
+	if v, err := db.ZExpireAt(key, when); err != nil {
+		return nil, err
+	} else {
+		return v, nil
+	}
+}
+
+func zttlCommand(db *ledis.DB, args ...string) (interface{}, error) {
+	if len(args) != 1 {
+		return nil, fmt.Errorf(ERR_ARGUMENT_FORMAT, "zttl")
+	}
+
+	key := []byte(args[0])
+	if v, err := db.ZTTL(key); err != nil {
+		return nil, err
+	} else {
+		return v, nil
+	}
+}
+
+func zpersistCommand(db *ledis.DB, args ...string) (interface{}, error) {
+	if len(args) != 1 {
+		return nil, fmt.Errorf(ERR_ARGUMENT_FORMAT, "zpersist")
+	}
+
+	key := []byte(args[0])
+	if n, err := db.ZPersist(key); err != nil {
+		return nil, err
+	} else {
+		return n, nil
+	}
+}
+
+func init() {
+	register("zadd", zaddCommand)
+	register("zcard", zcardCommand)
+	register("zcount", zcountCommand)
+	register("zincrby", zincrbyCommand)
+	register("zrange", zrangeCommand)
+	register("zrangebyscore", zrangebyscoreCommand)
+	register("zrank", zrankCommand)
+	register("zrem", zremCommand)
+	register("zremrangebyrank", zremrangebyrankCommand)
+	register("zremrangebyscore", zremrangebyscoreCommand)
+	register("zrevrange", zrevrangeCommand)
+	register("zrevrank", zrevrankCommand)
+	register("zrevrangebyscore", zrevrangebyscoreCommand)
+	register("zscore", zscoreCommand)
+
+	//ledisdb special command
+
+	register("zclear", zclearCommand)
+	register("zmclear", zmclearCommand)
+	register("zexpire", zexpireCommand)
+	register("zexpireat", zexpireAtCommand)
+	register("zttl", zttlCommand)
+	register("zpersist", zpersistCommand)
+}
diff --git a/server/http/handler.go b/server/http/handler.go
index d395534..0c9ae1b 100644
--- a/server/http/handler.go
+++ b/server/http/handler.go
@@ -42,8 +42,9 @@ func (h *CmdHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 
 func (h *CmdHandler) parseReqPath(path string) (db int, cmd string, args []string) {
 	/*
-	   the proper format of `path`  is /cmd/arg1/arg2/../argN  or  /db/cmd/arg1/arg2/../argN
-	   if `path` is the first kind, `db` will be 0
+	      this function extracts `db`, `cmd` and `args` from `path`
+	      the proper format of `path`  is /cmd/arg1/arg2/../argN  or  /db/cmd/arg1/arg2/../argN
+	   	  if `path` is the first kind, `db` will be 0
 	*/
 	substrings := strings.Split(strings.TrimLeft(path, "/"), "/")
 	if len(substrings) == 1 {