AngularJS$HTTP Get方法错误，如“对飞行前请求的响应”

Question

 $http({
    method: 'GET',
    url : 'http: //esbuatt1wm.ito.unisys.com:7001/invoke/wm.server/ping',
        timeout: 10000,
    headers: {
        'Access-Control-Allow-Origin': '*',
        'Access-Control-Allow-Methods': 'GET,POST,PUT,DELETE,OPTIONS,JSONP',
        'Content-Type': '*',
        'Access-Control-Allow-Headers': 'Content-Type',
        'Access-Control-Allow-Credentials': 'true'
    },
    params: {}, // Query Parameters (GET)
    transformResponse: function(data, status, headers, config) {
        console.log('transferms data ' + data);
        // string -> XML document object
        return $.parseXML(data);
    }
 }).success(function(data, status, headers, config) {
    // XML document object
    $scope.xml = data.documentElement.innerHTML;
    console.dir('xml data ' + $scope.xml);
 }).error(function(data, status, headers, config) {
    $window.alert('ERROR.');
 });

XMLHttpRequest无法加载http://esbuatt1wm.ito.unisys.com:7001/invoke/wm.server/ping。对飞行前请求的响应没有通过访问控制检查：在所请求的资源上没有“访问-控制-允许-起源”标头。因此，不允许访问源'http://localhost:1337'。

Answer 1

提供header对您没有帮助，因为您仍然从本地即localhost访问服务器。问题是当您从本地点击服务器时，服务器会将该请求视为不同域的请求。

您可以使用express.js（express是一个服务器）。在这种情况下，服务器正在与服务器通信，因此，此错误将被删除。

或者，如果在服务器上，您试图击中，您的后端代码仍然存在，启用CORS请求的特定呼叫或任何其他呼叫时，您将进行。

import java.io.IOException;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Component;

@Component
public class SimpleCORSFilter implements Filter {

private final Logger log = LoggerFactory.getLogger(SimpleCORSFilter.class);

public SimpleCORSFilter() {
    log.info("SimpleCORSFilter init");
}

@Override
public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain) throws IOException, ServletException {

    HttpServletRequest request = (HttpServletRequest) req;
    HttpServletResponse response = (HttpServletResponse) res;

    response.setHeader("Access-Control-Allow-Origin", request.getHeader("Origin"));
    response.setHeader("Access-Control-Allow-Credentials", "true");
    response.setHeader("Access-Control-Allow-Methods", "POST, GET, OPTIONS, DELETE");
    response.setHeader("Access-Control-Max-Age", "3600");
    response.setHeader("Access-Control-Allow-Headers", "Content-Type, Accept, X-Requested-With, remember-me");

    chain.doFilter(req, res);
}

@Override
public void init(FilterConfig filterConfig) {
}

@Override
public void destroy() {
}

}`