如何解决http 请求 |方法帖|请求被阻止 | js 和 php
error 1 (solved): Access to XMLHttpRequest at 'http://example.com/projects/saveBoors/' from origin
'http://www.tsetmc.com' has been blocked by CORS policy:
No 'Access-Control-Allow-Origin' header is present on the requested resource.
error 2: Failed to load resource: net::ERR_Failed
嘿伙计们，你知道我该如何解决这 2 个错误吗？
我正在使用方法 js 从 PHP 向 POST 发送请求，这是我在浏览器控制台中返回的错误...
我的js：
true == function() {
var xhr = new XMLHttpRequest();
xhr.open("POST",'http://195.234.191.26:8080/projects/saveBoors/',true);
xhr.setRequestHeader("Content-Type","application/x-www-form-urlencoded");
var data = "";
data = data + "namad=" + (l18) + "&";
data = data + "name=" + (l30) + "&";
data = data + "NumberTransactions=" + (tno) + "&";
data = data + "Turnover=" + (tvol) + "&";
data = data + "valueTransactions=" + (tval) + "&";
data = data + "yesterdayPrice=" + (py) + "&";
data = data + "priceFirst=" + (pf) + "&";
data = data + "minPrice=" + (pmin) + "&";
data = data + "maxPrice=" + (pmax) + "&";
data = data + "lastPrice=" + (pl) + "&";
data = data + "diffPrice=" + (plc) + "&";
data = data + "plp=" + (plp) + "&";
data = data + "finalPrice=" + (pc) + "&";
data = data + "diffFinalPrice=" + (pcc) + "&";
data = data + "pcp=" + (pcp) + "&";
data = data + "tmin=" + (tmin) + "&";
data = data + "tmax=" + (tmax) + "&";
data = data + "number=" + (z) + "&";
data = data + "mv=" + (mv) + "&";
data = data + "pd1=" + (pd1) + "&";
data = data + "zd1=" + (zd1) + "&";
data = data + "qd1=" + (qd1) + "&";
data = data + "po1=" + (po1) + "&";
data = data + "zo1=" + (zo1) + "&";
data = data + "qo1=" + (qo1) + "&";
data = data + "pd2=" + (pd2) + "&";
data = data + "zd2=" + (zd2) + "&";
data = data + "qd2=" + (qd2) + "&";
data = data + "po2=" + (po2) + "&";
data = data + "zo2=" + (zo2) + "&";
data = data + "qo2=" + (qo2) + "&";
data = data + "pd3=" + (pd3) + "&";
data = data + "zd3=" + (zd3) + "&";
data = data + "qd3=" + (qd3) + "&";
data = data + "po3=" + (po3) + "&";
data = data + "zo3=" + (zo3) + "&";
data = data + "qo3=" + (qo3) + "&";
data = data + "bvol=" + (bvol) + "&";
data = data + "cs=" + (cs) + "&";
data = data + "numberActualBuyers=" + (ct).Buy_CountI + "&";
data = data + "numberLegalBuyers=" + (ct).Buy_CountN + "&";
data = data + "numberActualSellers=" + (ct).Sell_CountI + "&";
data = data + "numberLegalSellers=" + (ct).Sell_CountN + "&";
data = data + "actualPurchaseVolume=" + (ct).Buy_I_Volume + "&";
data = data + "LegalPurchaseVolume=" + (ct).Buy_N_Volume + "&";
data = data + "realSalesVolume=" + (ct).Sell_I_Volume + "&";
data = data + "legalSalesVolume=" + (ct).Sell_N_Volume;
xhr.send(data);
console.log(data);
return true;
}()
和我的 PHP:
<?PHP
define('HOST','localhost');
define('dbnAME','Boors');
define('DBUSER','root');
define('DBPASS','');
$con = new PDO('MysqL:host=' . HOST . ';dbname=' . dbnAME,DBUSER,DBPASS);
$con->setAttribute(PDO::ATTR_ERRMODE,PDO::ERRMODE_EXCEPTION);
$con->exec('set names utf8');
if ($_POST == null){
exit;
}
$namad = $_POST['namad'];
$name = $_POST['name'];
$NumberTransactions = $_POST['NumberTransactions'];
$Turnover = $_POST['Turnover'];
$valueTransactions = $_POST['valueTransactions'];
$yesterdayPrice = $_POST['yesterdayPrice'];
$priceFirst = $_POST['priceFirst'];
$minPrice = $_POST['minPrice'];
$maxPrice = $_POST['maxPrice'];
$lastPrice = $_POST['lastPrice'];
$diffPrice = $_POST['diffPrice'];
$plp = $_POST['plp'];
$finalPrice = $_POST['finalPrice'];
$diffFinalPrice = $_POST['diffFinalPrice'];
$pcp = $_POST['pcp'];
$tmin = $_POST['tmin'];
$tmax = $_POST['tmax'];
$Number = $_POST['Number'];
$mv = $_POST['mv'];
$pd1 = $_POST['pd1'];
$zd1 = $_POST['zd1'];
$qd1 = $_POST['qd1'];
$po1 = $_POST['po1'];
$zo1 = $_POST['zo1'];
$qo1 = $_POST['qo1'];
$pd2 = $_POST['pd2'];
$zd2 = $_POST['zd2'];
$qd2 = $_POST['qd2'];
$po2 = $_POST['po2'];
$zo2 = $_POST['zo2'];
$qo2 = $_POST['qo2'];
$pd3 = $_POST['pd3'];
$zd3 = $_POST['zd3'];
$qd3 = $_POST['qd3'];
$po3 = $_POST['po3'];
$zo3 = $_POST['zo3'];
$qo3 = $_POST['qo3'];
$bvol = $_POST['bvol'];
$cs = $_POST['cs'];
$numberActualBuyers = $_POST['numberActualBuyers'];
$numberLegalBuyers = $_POST['numberLegalBuyers'];
$numberActualSellers = $_POST['numberActualSellers'];
$numberLegalSellers = $_POST['numberLegalSellers'];
$actualPurchaseVolume = $_POST['actualPurchaseVolume'];
$LegalPurchaseVolume = $_POST['LegalPurchaseVolume'];
$realSalesVolume = $_POST['realSalesVolume'];
$legalSalesVolume = $_POST['legalSalesVolume'];
$sql = "INSERT INTO `details`(`namad`,`name`,`NumberTransactions`,`Turnover`,`valueTransactions`,`yesterdayPrice`,`priceFirst`,`minPrice`,`maxPrice`,`lastPrice`,`diffPrice`,`plp`,`finalPrice`,`diffFinalPrice`,`pcp`,`tmin`,`tmax`,`Number`,`mv`,`pd1`,`zd1`,`qd1`,`po1`,`zo1`,`qo1`,`pd2`,`zd2`,`qd2`,`po2`,`zo2`,`qo2`,`pd3`,`zd3`,`qd3`,`po3`,`zo3`,`qo3`,`bvol`,`cs`,`numberActualBuyers`,`numberLegalBuyers`,`numberActualSellers`,`numberLegalSellers`,`actualPurchaseVolume`,`LegalPurchaseVolume`,`realSalesVolume`,`legalSalesVolume`) VALUES (?,?,?)";
$query = $con->prepare($sql);
$query->bindValue(1,$namad);
$query->bindValue(2,$name);
$query->bindValue(3,$NumberTransactions);
$query->bindValue(4,$Turnover);
$query->bindValue(5,$valueTransactions);
$query->bindValue(6,$yesterdayPrice);
$query->bindValue(7,$yesterdayPrice);
$query->bindValue(8,$minPrice);
$query->bindValue(9,$maxPrice);
$query->bindValue(10,$lastPrice);
$query->bindValue(11,$diffPrice);
$query->bindValue(12,$plp);
$query->bindValue(13,$finalPrice);
$query->bindValue(14,$diffFinalPrice);
$query->bindValue(15,$pcp);
$query->bindValue(16,$tmin);
$query->bindValue(17,$tmax);
$query->bindValue(18,$Number);
$query->bindValue(19,$mv);
$query->bindValue(20,$pd1);
$query->bindValue(21,$zd1);
$query->bindValue(22,$qd1);
$query->bindValue(23,$po1);
$query->bindValue(24,$zo1);
$query->bindValue(25,$qo1);
$query->bindValue(26,$pd2);
$query->bindValue(27,$zd2);
$query->bindValue(28,$qd2);
$query->bindValue(29,$po2);
$query->bindValue(30,$zo2);
$query->bindValue(31,$qo2);
$query->bindValue(32,$pd3);
$query->bindValue(33,$zd3);
$query->bindValue(34,$qd3);
$query->bindValue(35,$po3);
$query->bindValue(36,$zo3);
$query->bindValue(37,$qo3);
$query->bindValue(38,$bvol);
$query->bindValue(39,$cs);
$query->bindValue(40,$numberActualBuyers);
$query->bindValue(41,$numberLegalBuyers);
$query->bindValue(42,$numberActualSellers);
$query->bindValue(43,$numberLegalSellers);
$query->bindValue(44,$actualPurchaseVolume);
$query->bindValue(45,$LegalPurchaseVolume);
$query->bindValue(46,$realSalesVolume);
$query->bindValue(47,$legalSalesVolume );
$query->execute();
header("Access-Control-Allow-Origin: http://www.tsetmc.com");
?>
() 中的值如 (mv) 是预定义的变量！
解决方法
当您的前端与后端不在同一个 IP/域上运行时，就会发生 CORS 错误。在这里，您的 php 看到请求来自其他地方，出于安全原因不会执行。
大多数情况下，您希望在同一台服务器上运行两者。如果出于开发目的，情况并非如此，您始终可以在 php 顶部添加以下行以明确允许所有来源：
header("Access-Control-Allow-Origin: {$_SERVER['HTTP_ORIGIN']}");
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