js ajax設置和獲取自定義header信息的方法總結

時間 2019-12-13

標籤 ajax 設置獲取自定義 header 信息方法總結欄目 JavaScript 简体版

原文原文鏈接

目錄javascript

1.1 方法一：

$.ajax({
    type: "POST",
    url: "Handler1.ashx",
    contentType: "application/x-www-form-urlencoded",
    beforeSend: function (request) {
        request.setRequestHeader("token1", "Chenxizhang");
    },
    success: function (data) {
        //your code
    }
});

1.2 方法二：

$.ajax({
    headers: {
        "testheader": "test"
    },
    type: "POST",
    url: "Handler1.ashx",
    contentType: "application/x-www-form-urlencoded",
    success: function (data) {
        //your code
    }
});

ajax請求完成，會返回xhr（XMLHTTPRequest）對象，這裏面會包含返回的頭信息，能夠經過getResponseHeader(key)和getAllResponseHeaders()獲取header信息；java

$.ajax({
    type: "POST",
    url: "Handler1.ashx",
    contentType: "application/x-www-form-urlencoded",
    success: function (data) {
        //your code
    },
    complete: function (xhr, data) {
        /* 
            獲取相關Http Response header
            getResponseHeader(key)：獲取指定頭信息
            getAllResponseHeaders()：獲取所有可默承認獲取的頭信息
        */
        var date=xhr.getResponseHeader('Date');// 服務器端時間
        
        //獲取服務端自定義的header信息
        var stoken = xhr.getResponseHeader('servertoken');
        
        var list = xhr.getAllResponseHeaders();
        console.log(list);
        /*
        date: Fri, 12 Jul 2019 12:41:00 GMT
        content-encoding: gzip
        server: Microsoft-IIS/10.0
        x-aspnet-version: 4.0.30319
        x-powered-by: ASP.NET
        vary: Accept-Encoding
        content-type: text/plain; charset=utf-8
        servertoken: test1
        cache-control: private
        content-length: 129
        */
        
    }
});

JS AJAX 跨域請求的時候是不能設置自定義的header信息的，可是是能夠在response中獲取到服務端自定義的header信息，前提是服務端設置了Access-Control-Expose-Headers；
下面是 ASP.NET 的服務端示例：ajax

public void ProcessRequest(HttpContext context)
{
    context.Response.AddHeader("Access-Control-Allow-Origin", "*");
    context.Response.AddHeader("Access-Control-Allow-Headers", "*");
    context.Response.AddHeader("Access-Control-Allow-Methods", "*");
    //自定義header信息
    context.Response.AddHeader("servertoken", "test");
    context.Response.AddHeader("Access-Control-Expose-Headers", "servertoken");
    context.Response.ContentType = "text/plain";
    context.Response.Write("Hello World");
}

——————————————————————————————————————跨域