HTTP POST响应失败Angular 16

我被一个http失败响应"未知错误"困扰，我没有找到问题在哪里. 使用PDO，当我用messageText"string"将对象发送到Mysql服务器登录时，一切都很好，并连接到Mysql，但当我向表添加查询POST时，会出现以下错误:

{"headers": {"normalizedNames": {},"lazyUpdate": null,"headers": {}},"status": 0,"statusText": "Unknown     Error","url": "https://www.boulangerieqc.com/assets/crudmysql/insert_message.php","ok": false,"name":     "HttpErrorResponse","message": "Http failure response for     https://www.boulangerieqc.com/assets/crudmysql/insert_message.php: 0 Unknown Error","error":     {"isTrusted": true}}

我要捕捉我的消息文本的.ts是:

let connectionMysqlObjMessage={messageText:this.newMessage.value.messageText,db_host:this.extract.boulanger.db_host,db_username:this.extract.boulanger.db_username,db_name:this.extract.boulanger.db_name,db_password:this.extract.boulanger.db_password,}this.api.createMessageMysql(connectionMysqlObjMessage).subscribe((res)=>{console.log('avant api='+res)

我的火焰:

createMessageMysql(MessageObj: Object) {return this.http.post(this.baseUrl + 'insert_message.php',MessageObj, {responseType: 'json'})}

如果你有什么 idea ，我很乐意解决这个问题.