javascript-要返回哪种MIME类型？

我有一个带有发送AJAX请求的JavaScript代码的HTML页面.该请求正在由我的servlet处理.我认为从Servlet(响应内容类型)以MIME类型返回数据作为“ application / json” MIME类型是“更好”和“更正确”的选择.但是,它使MSIE疯狂-意味着浏览器似乎无法显示/处理此MIME类型(Chrome / FF很好).当我没有明确指定任何类型时-在所有浏览器中都可以正常工作.是否真的不应该从servlet中为AJAX请求返回MIME类型？

更新：我的服务器端是用Java实现的,MIME类型由以下行定义：

response.setContentType("application/json");

响应为以下文本(仅作为示例)：

{ "status" : "DONE", "progress" : 100, "url" : "/7909118672283641787.docx" , "totalBytes" : 17696 } 

Update2：由我的客户端代码组成的代码段(纯JavaScript,无库)

function display_progress(http) {
    if (http.readyState == 4) {
        var again = false;

        if (http.status != 200) {
            document.getElementById('progress_bar').innerHTML = "Wrong response status received: " + http.status + "! Fix the server-side code.";
        } else {
            try {
                var resp = eval('(' + http.responseText + ')');             
                var status = resp['status'];

                if (status == 'DOING') {
                    document.getElementById('progress_bar').innerHTML = "Uploaded: " + resp['progress'] + "%";
                    again = true;
                } else if (status == 'DONE'){
                    document.getElementById('progress_bar').innerHTML = 
                        "Uploaded 100% (" + resp['totalBytes'] + " bytes)! Your file is <a href=\"" + resp['url'] + "\"/>" + "here" + "</a>";
                } else if (status == 'ERROR') {
                    document.getElementById('progress_bar').innerHTML = "Error while uploading!";
                } else {
                    document.getElementById('progress_bar').innerHTML = "Unexpected state: " + status + "! Fix the server-side code.";
                }
            } catch (ex) {
                document.getElementById('progress_bar').innerHTML = "Wrong response received: " + resp + "! Fix the server-side code.";
            }
        }

        if (again) {
            setTimeout("update_progress()", 500);
        }
    }

解决方法:

将其作为原始文本返回,然后使用JSON.parse()转换为可用的JSON.

JSON不是文本,因此Firefox不知道该怎么做.因此,您需要基本上将其用作它确实知道的东西.

标签：content-type,mime-types,javascript
来源： https://codeday.me/bug/20191208/2091402.html