$http post 请求未添加指定的标头

Question

我正在使用$http向我的后端向我的服务器发出请求以用于登录目的，但即使在正确指定标头之后，它也会在预检我的请求并添加标头，我也从未问过它。

这是我向服务器发出的请求

$http({
       method: 'POST',
       url: 'http://localhost:8080/SignInMainServlet',
       data: $httpParamSerializerJQLike({
                login_source: source,
                accessToken: code,
                referrer_code: referral_id
            }),
       headers: { 'Content-Type': 'application/x-www-form-urlencoded;charset=utf-8' }
     });

这是我处理请求的服务器代码

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    // TODO Auto-generated method stub
    REFERRAL_CODE_COUNT++;
    String referrer_code=request.getParameter("referrer_code");
    String login_source=request.getParameter("login_source");
    String accessToken=request.getParameter("accessToken");
    SignInMainManager m = new SignInMainManager(accessToken, referrer_code, login_source,REFERRAL_CODE_COUNT);
    String result = m.signIn();

    response.setContentType("text/html");  
    response.addHeader("Access-Control-Allow-Origin","*");
    response.addHeader("Access-Control-Allow-Methods","POST");
    response.addHeader("Access-Control-Allow-Headers","Content-Type");
    PrintWriter out = response.getWriter(); 

    out.println(result);
    out.close();//closing the stream 

}

这是浏览器控制台显示的错误

XMLHttpRequest cannot load http://localhost:8080/SignInMainServlet. Response to preflight request doesn't pass access control check: No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://localhost:3000' is therefore not allowed access.

这就是 xhr 调用的请求、响应和一般在 chrome 上的样子

// Request//
OPTIONS /SignInMainServlet HTTP/1.1
Host: localhost:8080
Connection: keep-alive
Access-Control-Request-Method: POST
Origin: http://localhost:3000
User-Agent: Mozilla/5.0 (Linux; Android 6.0; Nexus 5 Build/MRA58N) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/56.0.2924.76 Mobile Safari/537.36
Access-Control-Request-Headers: authorization
Accept: */*
Referer: http://localhost:3000/
Accept-Encoding: gzip, deflate, sdch, br
Accept-Language: en-GB,en-US;q=0.8,en;q=0.6
//Response//
HTTP/1.1 200 OK
Date: Sun, 05 Feb 2017 10:44:57 GMT
Allow: POST, TRACE, OPTIONS
Content-Length: 0
Server: Jetty(8.1.14.v20131031)
//General//
Request URL:http://localhost:8080/SignInMainServlet
Request Method:OPTIONS
Status Code:200 OK
Remote Address:127.0.0.1:8080

被困在这里一天了。真的需要帮助！！

Answer 1

我看到你正在使用authentification.我相信您的预检请求不起作用，因为您错过了 CORS 中的某些配置。这样，您的预检请求将中止。像这样设置您的 CORS：

response.addHeader("Access-Control-Allow-Origin","*");
response.addHeader("Access-Control-Allow-Methods","GET, POST, OPTIONS");
response.addHeader("Access-Control-Allow-Credentials", "true");
response.addHeader("Access-Control-Allow-Headers","Origin, Content-Type, X-Auth-Token , Authorization");

最重要的是，您只配置了一个protected void doPost()侦听器。这样，预检OPTIONS请求没有配置 CORS，因为它侦听doOptions() 。添加doOptions()侦听器并将 CORS 配置放入其中或定义全局response CORS 。

有人这样想：

protected void doOptions(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    response.addHeader("Access-Control-Allow-Origin","*");
    response.addHeader("Access-Control-Allow-Methods","GET, POST, OPTIONS");
    response.addHeader("Access-Control-Allow-Credentials", "true");
    response.addHeader("Access-Control-Allow-Headers","Origin, Content-Type, X-Auth-Token , Authorization");
    PrintWriter out = response.getWriter();
    out.close();//closing the stream
}