diff --git a/client/server.go b/client/server.go
index 30c1330..1954ba6 100644
--- a/client/server.go
+++ b/client/server.go
@@ -112,7 +112,7 @@ func (ints *InternalServer) BuildToServerMessageInvitation(invitation *meowlib.C
 	msg.From = ints.Me.Public
 	inv.Password = password
 	inv.Timeout = int32(timeout)
-	inv.Urllen = int32(urllen)
+	inv.Idlen = int32(urllen)
 	inv.Payload = payload
 	msg.Invitation = &inv
 	return &msg, nil
diff --git a/messages.pb.go b/messages.pb.go
index 8c62b0f..ead12c1 100644
--- a/messages.pb.go
+++ b/messages.pb.go
@@ -98,9 +98,9 @@ type Invitation struct {
 
 	Payload  []byte `protobuf:"bytes,1,opt,name=payload,proto3" json:"payload,omitempty"`
 	Timeout  int32  `protobuf:"varint,2,opt,name=timeout,proto3" json:"timeout,omitempty"`
-	Urllen   int32  `protobuf:"varint,3,opt,name=urllen,proto3" json:"urllen,omitempty"`
+	Idlen    int32  `protobuf:"varint,3,opt,name=idlen,proto3" json:"idlen,omitempty"`
 	Password string `protobuf:"bytes,4,opt,name=password,proto3" json:"password,omitempty"`
-	Url      string `protobuf:"bytes,5,opt,name=url,proto3" json:"url,omitempty"`
+	Id       string `protobuf:"bytes,5,opt,name=id,proto3" json:"id,omitempty"`
 	Expiry   int64  `protobuf:"varint,6,opt,name=expiry,proto3" json:"expiry,omitempty"`
 	Step     int32  `protobuf:"varint,7,opt,name=step,proto3" json:"step,omitempty"`
 }
@@ -151,9 +151,9 @@ func (x *Invitation) GetTimeout() int32 {
 	return 0
 }
 
-func (x *Invitation) GetUrllen() int32 {
+func (x *Invitation) GetIdlen() int32 {
 	if x != nil {
-		return x.Urllen
+		return x.Idlen
 	}
 	return 0
 }
@@ -165,9 +165,9 @@ func (x *Invitation) GetPassword() string {
 	return ""
 }
 
-func (x *Invitation) GetUrl() string {
+func (x *Invitation) GetId() string {
 	if x != nil {
-		return x.Url
+		return x.Id
 	}
 	return ""
 }
@@ -1357,204 +1357,203 @@ var file_messages_proto_rawDesc = []byte{
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 }
 
 var (
diff --git a/pb/messages.proto b/pb/messages.proto
index f8f817a..7aa4822 100644
--- a/pb/messages.proto
+++ b/pb/messages.proto
@@ -19,9 +19,9 @@ message PackedServerMessage {
 message Invitation {
     bytes payload = 1;
     int32 timeout = 2;
-    int32 urllen = 3;
+    int32 idlen = 3;
     string password = 4;
-    string url = 5;
+    string id = 5;
     int64 expiry = 6;
     int32 step = 7;
 }
diff --git a/server/invitation.go b/server/invitation.go
index 153dc71..a418d84 100644
--- a/server/invitation.go
+++ b/server/invitation.go
@@ -9,7 +9,7 @@ import (
 )
 
 func (r *RedisRouter) CreateInvitation(invitation []byte, timeout int, password string, serverTimeout int, urlLen int) (string, time.Time) {
-	id := r.createShortUrl(urlLen)
+	id := r.createShortId(urlLen)
 	if timeout > serverTimeout {
 		timeout = serverTimeout
 	}
@@ -54,17 +54,17 @@ func (r *RedisRouter) GetInvitationAnswer(id string) ([]byte, error) {
 	return []byte(mwan), nil
 }
 
-func (r *RedisRouter) createShortUrl(length int) string {
-	url := ""
+func (r *RedisRouter) createShortId(length int) string {
+	id := ""
 	alphabet := "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"
 	// for not in redis
 	for {
 		for i := 1; i <= length; i++ {
-			url += string(alphabet[rand.Intn(61)])
+			id += string(alphabet[rand.Intn(61)])
 		}
-		if r.Client.Get("mwiv:"+url).Err() == redis.Nil {
+		if r.Client.Get("mwiv:"+id).Err() == redis.Nil {
 			break
 		}
 	}
-	return url
+	return id
 }
diff --git a/server/router.go b/server/router.go
index cfdd203..7e99d1d 100644
--- a/server/router.go
+++ b/server/router.go
@@ -93,11 +93,11 @@ func (r *RedisRouter) Route(msg *meowlib.ToServerMessage) (*meowlib.FromServerMe
 	if msg.Invitation != nil {
 		switch msg.Invitation.Step {
 		case 1: // create invitation
-			url, expiry := r.CreateInvitation(msg.Invitation.Payload, int(msg.Invitation.Timeout), msg.Invitation.Password, r.InvitationTimeout, int(msg.Invitation.Urllen))
-			from_server.Invitation.Url = url
+			url, expiry := r.CreateInvitation(msg.Invitation.Payload, int(msg.Invitation.Timeout), msg.Invitation.Password, r.InvitationTimeout, int(msg.Invitation.Idlen))
+			from_server.Invitation.Id = url
 			from_server.Invitation.Expiry = expiry.UTC().Unix()
 		case 2: // get invitation
-			invitation, err := r.GetInvitation(msg.Invitation.Url, msg.Invitation.Password)
+			invitation, err := r.GetInvitation(msg.Invitation.Id, msg.Invitation.Password)
 			if err != nil {
 				if err.Error() == "auth failed" {
 					from_server.Invitation.Payload = []byte("authentication failure")
@@ -108,10 +108,10 @@ func (r *RedisRouter) Route(msg *meowlib.ToServerMessage) (*meowlib.FromServerMe
 				from_server.Invitation.Payload = invitation
 			}
 		case 3: // answer invitation
-			expiry := r.AnswerInvitation(msg.Invitation.Url, int(msg.Invitation.Timeout), msg.Invitation.Payload, r.InvitationTimeout)
+			expiry := r.AnswerInvitation(msg.Invitation.Id, int(msg.Invitation.Timeout), msg.Invitation.Payload, r.InvitationTimeout)
 			from_server.Invitation.Expiry = expiry.UTC().Unix()
 		case 4: // get answer
-			answer, err := r.GetInvitationAnswer(msg.Invitation.Url)
+			answer, err := r.GetInvitationAnswer(msg.Invitation.Id)
 			if err != nil {
 				from_server.Invitation.Payload = []byte("invitation expired")
 			} else {