diff --git a/cache.go b/cache.go
index 4219dfa..6bffd65 100644
--- a/cache.go
+++ b/cache.go
@@ -6,8 +6,8 @@ import (
 	"sync"
 )
 
-var Groups map[uint32]ChatGroup
-var ConnectedClients map[uint32]map[*Client]struct{}
+var Groups map[uint64]ChatGroup
+var ConnectedClients map[uint64]map[*Client]struct{}
 
 func InitCache() {
 	groups, err := GetAllChatGroups(context.Background())
@@ -20,7 +20,7 @@ func InitCache() {
 	}
 }
 
-func GetGroupById(groupId uint32) (*ChatGroup, error) {
+func GetGroupById(groupId uint64) (*ChatGroup, error) {
 	group, ok := Groups[groupId]
 	if !ok {
 		return nil, errors.New("group not found")
@@ -31,18 +31,21 @@ func GetGroupById(groupId uint32) (*ChatGroup, error) {
 func AddOrUpdateGroupToCache(mu *sync.Mutex, group ChatGroup) {
 	mu.Lock()
 	defer mu.Unlock()
+
 	Groups[group.Id] = group
 }
 
-func RemoveGroupFromCache(mu *sync.Mutex, groupId uint32) {
+func RemoveGroupFromCache(mu *sync.Mutex, groupId uint64) {
 	mu.Lock()
 	defer mu.Unlock()
+
 	delete(Groups, groupId)
 }
 
 func AddOrUpdateConnectedClientToCache(mu *sync.Mutex, client *Client) {
 	mu.Lock()
 	defer mu.Unlock()
+
 	for _, groupId := range client.User.MemberGroupsId {
 		ConnectedClients[groupId][client] = struct{}{}
 	}
@@ -51,7 +54,24 @@ func AddOrUpdateConnectedClientToCache(mu *sync.Mutex, client *Client) {
 func RemoveConnectedClientFromCache(mu *sync.Mutex, client *Client) {
 	mu.Lock()
 	defer mu.Unlock()
+
 	for _, groupId := range client.User.MemberGroupsId {
 		delete(ConnectedClients[groupId], client)
 	}
 }
+
+func IsUserInGivenGroup(mu *sync.Mutex, userId uint64, groupId uint64) bool {
+	mu.Lock()
+	defer mu.Unlock()
+
+	group, ok := ConnectedClients[groupId]
+	if !ok {
+		return false
+	}
+	for client := range group {
+		if client.User.Id == userId {
+			return true
+		}
+	}
+	return false
+}
diff --git a/database.go b/database.go
index 777e09e..894654b 100644
--- a/database.go
+++ b/database.go
@@ -48,8 +48,8 @@ func InitDatabase(ctx context.Context) {
 	InitCache()
 }
 
-func AddNewUser(ctx context.Context, user *User) (uint32, error) {
-	var id uint32
+func AddNewUser(ctx context.Context, user *User) (uint64, error) {
+	var id uint64
 	var err error
 
 	if len(user.Name) == 0 || len(user.Name) > 20 {
@@ -68,17 +68,18 @@ func AddNewUser(ctx context.Context, user *User) (uint32, error) {
 		user.Password = string(hashed)
 	}
 	if user.Color == ([3]byte{}) {
-		return 0, errors.New("color invalid")
+		user.Color = [3]byte{'x', 'x', 'x'}
 	}
+	c := string(user.Color[:])
 	err = dbConnection.QueryRow(ctx, `
         INSERT INTO users (name, pass_hash, color)
         VALUES ($1, $2, $3)
         RETURNING id
-    `, user.Name, user.Password, user.Color).Scan(&id)
+    `, user.Name, user.Password, c).Scan(&id)
 	return id, err
 }
 
-func isPassValid(ctx context.Context, id uint32, plainPassword string) bool {
+func isPassValid(ctx context.Context, id uint64, plainPassword string) bool {
 	var controlHash string
 	err := dbConnection.QueryRow(ctx, "SELECT pass_hash FROM users WHERE id = $1", id).Scan(&controlHash)
 	if err != nil {
@@ -106,7 +107,7 @@ func GetAllUsers(ctx context.Context) ([]User, error) {
 	return users, rows.Err()
 }
 
-func GetUserDataById(ctx context.Context, id uint32) (User, error) {
+func GetUserDataById(ctx context.Context, id uint64) (User, error) {
 	var user User
 	err := dbConnection.QueryRow(ctx, "SELECT id, name, pass_hash, color FROM users WHERE id = $1", id).
 		Scan(&user.Id, &user.Name, &user.Password, &user.Color)
@@ -127,7 +128,7 @@ func GetUserDataByName(ctx context.Context, name string) (User, error) {
 	return user, nil
 }
 
-func CreateChatGroupWithoutMembers(ctx context.Context, group *ChatGroup) (uint32, error) {
+func CreateChatGroupWithoutMembers(ctx context.Context, group *ChatGroup) (uint64, error) {
 	if len(group.Name) < 1 {
 		return 0, errors.New("group name too short")
 	}
@@ -135,12 +136,16 @@ func CreateChatGroupWithoutMembers(ctx context.Context, group *ChatGroup) (uint3
 		return 0, errors.New("group name too long")
 	}
 
-	var id uint32
+	var id uint64
 	err := dbConnection.QueryRow(ctx, `INSERT INTO chat_groups (name, creator_id, owner_id, created_at )
 			VALUES ($1, $2, $3, $4)
 			RETURNING id
 		`, group.Name, group.CreatorId, group.OwnerId, group.CreatedAt).Scan(&id)
 
+	if err != nil {
+		return 0, err
+	}
+
 	AddOrUpdateGroupToCache(&mu, *group)
 	return id, err
 }
@@ -163,14 +168,32 @@ func GetAllChatGroups(ctx context.Context) ([]ChatGroup, error) {
 	return groups, rows.Err()
 }
 
-func GetChatGroupWithoutMembers(ctx context.Context, id uint32) (ChatGroup, error) {
+func GetChatGroupWithoutMembers(ctx context.Context, id uint64) (ChatGroup, error) {
 	var group ChatGroup
 	err := dbConnection.QueryRow(ctx, `SELECT name, creator_id, owner_id, enable_user_colors, group_color, created_at FROM chat_groups WHERE id = $1`,
 		id).Scan(&group.Name, &group.CreatorId, &group.OwnerId, &group.EnableUserColors, &group.Color, &group.CreatedAt)
 	return group, err
 }
 
-func GetChatGroupMembers(ctx context.Context, groupId uint32) ([]User, error) {
+func GetUserMemberGroupIds(ctx context.Context, userId uint64) ([]uint64, error) {
+	rows, err := dbConnection.Query(ctx, "SELECT group_id FROM chat_group_members WHERE user_id = $1", userId)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+
+	var groupIds []uint64
+	for rows.Next() {
+		var groupId uint64
+		if err := rows.Scan(&groupId); err != nil {
+			return nil, err
+		}
+		groupIds = append(groupIds, groupId)
+	}
+	return groupIds, rows.Err()
+}
+
+func GetChatGroupMembers(ctx context.Context, groupId uint64) ([]User, error) {
 	rows, err := dbConnection.Query(ctx, `
 		SELECT usr.id, usr.name, usr.color FROM users usr
 		JOIN chat_group_members members ON usr.id = members.user_id
diff --git a/enums.go b/enums.go
new file mode 100644
index 0000000..88dcf59
--- /dev/null
+++ b/enums.go
@@ -0,0 +1,8 @@
+package main
+
+type serverResponseType struct {
+	MessageFromUser uint8
+	BadRequest      uint8
+}
+
+var ServerResponseType = serverResponseType{0, 1}
diff --git a/go-socket b/go-socket
index 27a7243..5adad46 100755
Binary files a/go-socket and b/go-socket differ
diff --git a/http.go b/http.go
index 066694e..eaf355d 100644
--- a/http.go
+++ b/http.go
@@ -3,6 +3,7 @@ package main
 import (
 	"log"
 	"net/http"
+	"strconv"
 	"time"
 
 	"golang.org/x/crypto/bcrypt"
@@ -30,6 +31,7 @@ func RegisterHandler(response http.ResponseWriter, request *http.Request) {
 	}
 	if username == "server" {
 		http.Error(response, "only server can use such name", http.StatusBadRequest)
+		return
 	}
 	if len(password) < 8 {
 		http.Error(response, "short or no password", http.StatusBadRequest)
@@ -72,12 +74,14 @@ func LoginHandler(response http.ResponseWriter, request *http.Request) {
 	}
 
 	if len(username) < 2 {
+		log.Printf("username<2")
 		respondBadLogin()
 		return
 	}
 
 	user, err := GetUserDataByName(ctx, username)
 	if err != nil {
+		log.Printf("could not get user: %v", err)
 		respondBadLogin()
 		return
 	}
@@ -94,6 +98,7 @@ func LoginHandler(response http.ResponseWriter, request *http.Request) {
 		}
 		return
 	}
+	log.Printf("bad hash")
 	respondBadLogin()
 }
 
@@ -129,10 +134,11 @@ func CreateGroupHandler(response http.ResponseWriter, request *http.Request) {
 	response.WriteHeader(http.StatusCreated)
 }
 
-func SendMessageHandler(response http.ResponseWriter, request *http.Request) {
-	groupId := request.PathValue("groupid")
-	if groupId == "" {
+func SendMessageToGroupHandler(response http.ResponseWriter, request *http.Request) {
+	groupIdString := request.PathValue("groupid")
+	if groupIdString == "" {
 		http.Error(response, "no group id", http.StatusBadRequest)
+		return
 	}
 
 	var user User
@@ -142,7 +148,7 @@ func SendMessageHandler(response http.ResponseWriter, request *http.Request) {
 		http.Error(response, "no token", http.StatusBadRequest)
 		return
 	}
-	if user, err = GetUserFromToken(token); err != nil || user == nil {
+	if user, err = GetUserFromToken(token); err != nil {
 		http.Error(response, "invalid token", http.StatusUnauthorized)
 		return
 	}
@@ -153,8 +159,35 @@ func SendMessageHandler(response http.ResponseWriter, request *http.Request) {
 		return
 	}
 
-	var isInGroup bool
-	for _, groupId := range user.MemberGroupsId {
+	groupId, err := strconv.ParseUint(groupIdString, 10, 64)
+	if err != nil {
+		http.Error(response, "no such group", http.StatusBadRequest)
+		return
+	}
 
+	groupIds, err := GetUserMemberGroupIds(request.Context(), user.Id)
+	if err != nil {
+		http.Error(response, "internal server error", http.StatusInternalServerError)
+		return
+	}
+	isMember := false
+	for _, id := range groupIds {
+		if id == groupId {
+			isMember = true
+			break
+		}
+	}
+	if isMember {
+		var message = map[string]any{
+			"type":    ServerResponseType.MessageFromUser,
+			"content": content,
+			"from":    user,
+			"time":    time.Now().Unix(),
+		}
+		err := sendToGroup(groupId, user.Id, &message)
+		if err != nil {
+			http.Error(response, "internal server error", http.StatusInternalServerError)
+			return
+		}
 	}
 }
diff --git a/main.go b/main.go
index a34e5d4..cafce58 100644
--- a/main.go
+++ b/main.go
@@ -32,7 +32,7 @@ func main() {
 	http.HandleFunc("POST /new/account", RegisterHandler)
 	http.HandleFunc("POST /new/token", LoginHandler)
 	http.HandleFunc("POST /new/group", CreateGroupHandler)
-	http.HandleFunc("POST /new/messageto/{groupid}", SendMessageHandler)
+	http.HandleFunc("POST /new/messageto/group/{groupid}", SendMessageToGroupHandler)
 
 	log.Fatal(http.ListenAndServe(":8080", nil))
 }
diff --git a/structures.go b/structures.go
index 08fde35..77b4a14 100644
--- a/structures.go
+++ b/structures.go
@@ -7,11 +7,11 @@ import (
 )
 
 type User struct {
-	MemberGroupsId   []uint32
+	MemberGroupsId   []uint64
 	Name             string
 	Password         string
 	Color            [3]byte
-	Id               uint32
+	Id               uint64
 	IsPasswordHashed bool
 }
 type Client struct {
@@ -23,9 +23,9 @@ type ChatGroup struct {
 	Members          []User
 	CreatedAt        time.Time
 	Name             string
-	Id               uint32
-	CreatorId        uint32
-	OwnerId          uint32
+	Id               uint64
+	CreatorId        uint64
+	OwnerId          uint64
 	Color            [3]byte
 	EnableUserColors bool
 }
diff --git a/tokens.go b/tokens.go
index 93bb2a0..4471f63 100644
--- a/tokens.go
+++ b/tokens.go
@@ -48,7 +48,7 @@ func GetUserFromToken(tokenString string) (User, error) {
 		return User{}, errors.New("invalid token")
 	}
 
-	id, err := strconv.ParseUint(claims.Subject, 10, 32)
+	id, err := strconv.ParseUint(claims.Subject, 10, 64)
 	if err != nil {
 		return User{}, fmt.Errorf("invalid subject: %w", err)
 	}
@@ -56,7 +56,7 @@ func GetUserFromToken(tokenString string) (User, error) {
 	var color [3]byte
 	copy(color[:], claims.Color)
 	return User{
-		Id:    uint32(id),
+		Id:    id,
 		Name:  claims.Name,
 		Color: color,
 	}, nil
diff --git a/wsServer.go b/wsServer.go
index 52a360c..cc3c93d 100644
--- a/wsServer.go
+++ b/wsServer.go
@@ -68,7 +68,7 @@ func sendAndCloseIfFails(conn *websocket.Conn, message *map[string]any) {
 		conn.Close(websocket.StatusGoingAway, "Write error")
 	}
 }
-func sendToGroup(id uint32, excludedUserId uint32, message *map[string]any) error {
+func sendToGroup(id uint64, excludedUserId uint64, message *map[string]any) error {
 	if _, ok := Groups[id]; !ok {
 		return errors.New("Group Not Found")
 	}
@@ -82,12 +82,23 @@ func sendToGroup(id uint32, excludedUserId uint32, message *map[string]any) erro
 }
 
 func handleUnauthenticatedMessage(client *Client, msg map[string]any) {
-	token := msg["token"].(string)
+	token, ok := msg["token"].(string)
+	if !ok {
+		client.conn.Close(websocket.StatusGoingAway, "invalid token")
+		return
+	}
+
 	user, err := GetUserFromToken(token)
 	if err != nil {
 		client.conn.Close(websocket.StatusPolicyViolation, "invalid token")
 		return
 	}
+	groupIds, err := GetUserMemberGroupIds(context.Background(), user.Id)
+	if err != nil {
+		client.conn.Close(websocket.StatusInternalError, "internal error")
+		return
+	}
+	user.MemberGroupsId = groupIds
 	client.User = &user
 	m := map[string]any{
 		"authAs": user.Name,