在出现异常的情况下,在用户计算机上获取 text/html 响应而不是 application/json

Getting text/html Response instead of application/json on user machine in case of Exception

我遇到 JSON 响应的奇怪问题。

MVC 应用程序 A 托管在服务器 A 上。当用户浏览 URL 时,它在内部调用 MVC 操作以使用 JQuery Ajax 在 UI 中获取数据。

MVC 动作:

    Try
       Return Json(mRetResponse, JsonRequestBehavior.AllowGet)
    Catch ex As Exception
                    HttpContext.Response.StatusCode = System.Net.HttpStatusCode.InternalServerError
                    Dim mErrorMessage As String = ex.Message.Replace("Error -", "")

                    <<ObjErrorResponse is created here by assigning error message.>>

                    Return Json(ObjErrorResponse, JsonRequestBehavior.AllowGet)
                End Try

JQUERY 调用

CommonJS.ShowProgress();
                CommonJS.ajaxPost(_Controller + "/Delete"
                    , 'json'
                    , { // dataParam // }
                    , function (msg) {
                        CommonJS.HideProgress();
                        var responseObj = msg;
                        if (responseObj.Success) {
                            if ((responseObj.Data) && typeof responseObj.Data === 'string') {
                                alert(responseObj.Data);
                            }
                            //Processing goes here 
                        }
                        else {
                            CommonJS.ShowErrors(responseObj);
                        }                        
                    }
                    , function (jqxhr, textStatus, error) {
                        CommonJS.HandleErrors(jqxhr);
                    }
                    , true
                );

当我们在用户机器(而不是服务器机器)上浏览 MVC 应用程序 URL 时,我们得到以下行为

来自用户机器的更多信息。

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"/>
<title>500 - Internal server error.</title>
<style type="text/css">
<!--
body{margin:0;font-size:.7em;font-family:Verdana, Arial, Helvetica, sans-serif;background:#EEEEEE;}
fieldset{padding:0 15px 10px 15px;} 
h1{font-size:2.4em;margin:0;color:#FFF;}
h2{font-size:1.7em;margin:0;color:#CC0000;} 
h3{font-size:1.2em;margin:10px 0 0 0;color:#000000;} 
#header{width:96%;margin:0 0 0 0;padding:6px 2% 6px 2%;font-family:"trebuchet MS", Verdana, sans-serif;color:#FFF;
background-color:#555555;}
#content{margin:0 0 0 2%;position:relative;}
.content-container{background:#FFF;width:96%;margin-top:8px;padding:10px;position:relative;}
-->
</style>
</head>
<body>
<div id="header"><h1>Server Error</h1></div>
<div id="content">
 <div class="content-container"><fieldset>
  <h2>500 - Internal server error.</h2>
  <h3>There is a problem with the resource you are looking for, and it cannot be displayed.</h3>
 </fieldset></div>
</div>
</body>
</html>

预期响应:

{"Success":false,"Data":null,"Errors":[{"ErrorMessage":"Unable to peform Delete operation."}],"CustomData":{}}

除了设置状态代码外,您还需要在响应中设置 the TrySkipCustomIisErrors property。否则,IIS 将看到 500 响应和 return 其自定义“内部服务器错误”页面,而不是您自己的 JSON 响应。