function validator(obj) {


    let pattern = /^[\w\.\*]+$/g;

    let pattern2 = /(^[\w.]+$)/g;


    if (!['GET', 'POST', 'DELETE', 'CONNECT'].includes(obj.method) || !obj.hasOwnProperty('method')) {

       let e = new Error(`Invalid request header: Invalid Method`);

        throw e;

    } else if (pattern.test(obj.uri) === false || !obj.hasOwnProperty('uri') || obj.uri === '') {

       let e = new Error(`Invalid request header: Invalid URI`);

        throw e;

    } else if (!['HTTP/0.9', 'HTTP/1.0', 'HTTP/1.1', 'HTTP/2.0'].includes(obj.version) || !obj.hasOwnProperty('version')) {

        let e = new Error(`Invalid request header: Invalid Version`);

        throw e;

    } else if (pattern2.test(obj.message) || !obj.hasOwnProperty('message')) {

        let e = new Error(`Invalid request header: Invalid Message`);

        throw e;

    }



    return obj;

}