跨域問題記錄

傷城~ 2022-04-13 15:15 134阅读 0赞

![20181130112743794.png][]

問題如上圖,提示說是跨域問題,一直沒有解決,先記錄下

問題描述:.本機運行Vue項目里有個文件上傳功能,點擊上傳是服務器根本就沒有收到請求,在不同域下報錯,在同源域下正常運行,其他post請求數據的跨域都正常運行(服務器端只設定了 context.Response.AddHeader("Access-Control-Allow-Origin", "\*");)

網上解決方案一堆,都沒有解決這個問題,以下為網上提供的方案

1.html文檔里增加<meta http-equiv="Access-Control-Allow-Origin" content="\*">

2.xhr請求時指定跨域請求時 增加Access-Control-Allow-Origin和withCredentials設定為true

//option的部份代碼
    // option.headers 里增加
    withCredentials :{
        default: true//同域名下无效,true 不同域名下需要跨域支持
    },
     headers:{
        default: function () {
            return {
                    'Access-Control-Allow-Origin': "http://localhost:8080",//或者指定 * ,有人提到 用*可能還是無法提交請求 ,兩種都試了依然為解決問題
                    "Access-Control-Allow-Headers":"X-Requested-With,Content-Type",
                    "Access-Control-Allow-Methods":"PUT,POST,GET,DELETE,OPTIONS",                                
                    "Content-Type":"application/x-www-form-urlencoded;",                               
                     }
             }
    },
    
    //XMLHttpRequest 相關部份代碼
    const xhr = new XMLHttpRequest();
    xhr.open('post', action, true);
    if (option.withCredentials && 'withCredentials' in xhr) {
    xhr.withCredentials = true;
    }
    const headers = option.headers || {};
    for (let item in headers) {
    if (headers.hasOwnProperty(item) && headers[item] !== null) {
    xhr.setRequestHeader(item, headers[item]);
    }
    }
    xhr.send(formData);

3.服務器端 也增加 Access-Control-Allow-Origin相關設定

public void ProcessRequest(HttpContext context)
        {
            try
            {
                WebPublic.LogHelper.WriteLog("comming", "");//這個都沒執行,說明請求根本沒有進來
                context.Response.ContentType = "application/json";// "text/plain";這個也沒有用
                context.Response.AddHeader("Access-Control-Allow-Origin", "*");
                context.Response.AddHeader("Access-Control-Allow-Headers", "Content-Type,Content-Length, Authorization, Accept,X-Requested-With");
                context.Response.AddHeader("Access-Control-Allow-Methods", "PUT,POST,GET,DELETE,OPTIONS");
                context.Response.AddHeader("Access-Control-Allow-Credentials","true");

4.調試時,直接將cmd到google瀏覽器根目錄后執行chrome.exe –disable-web-security

參考[https://developer.mozilla.org/zh-CN/docs/Web/HTTP/CORS/Errors/CORSMissingAllowOrigin][https_developer.mozilla.org_zh-CN_docs_Web_HTTP_CORS_Errors_CORSMissingAllowOrigin]

參考[https://blog.csdn.net/china\_skag/article/details/42493399][https_blog.csdn.net_china_skag_article_details_42493399]

參考[https://segmentfault.com/a/1190000011361841][https_segmentfault.com_a_1190000011361841]

參考:[https://www.cnblogs.com/susanws/p/5474915.html][https_www.cnblogs.com_susanws_p_5474915.html]

參考:[https://blog.csdn.net/blueling51/article/details/7942812][https_blog.csdn.net_blueling51_article_details_7942812]

[20181130112743794.png]: /images/20220413/c34ea26166004f02953a597c80fd8435.png
[https_developer.mozilla.org_zh-CN_docs_Web_HTTP_CORS_Errors_CORSMissingAllowOrigin]: https://developer.mozilla.org/zh-CN/docs/Web/HTTP/CORS/Errors/CORSMissingAllowOrigin
[https_blog.csdn.net_china_skag_article_details_42493399]: https://blog.csdn.net/china_skag/article/details/42493399
[https_segmentfault.com_a_1190000011361841]: https://segmentfault.com/a/1190000011361841
[https_www.cnblogs.com_susanws_p_5474915.html]: https://www.cnblogs.com/susanws/p/5474915.html
[https_blog.csdn.net_blueling51_article_details_7942812]: https://blog.csdn.net/blueling51/article/details/7942812