【发布时间】：2015-01-28 18:14:17
【问题描述】：
我正在尝试使用 jquery 向我的 asp.net 服务器发送一个 ajax 请求并取回一些数据。但我似乎无法做到这一点。无论我做什么，我都会收到 Failed to load resource: the server responded with a status of 500 (Internal Server Error) 错误消息。我知道这是一个重复的问题，但我几乎阅读了我在 stackoverflow 和其他网站上可以阅读的所有内容，但没有一个解决方案对我有帮助。我正在尝试调试这件事并弄清楚我能做什么，但我没有不知道该怎么做
这是我的代码：
这里是 ajax 调用：
$(document).ready(function () {
$('.list-item button').on('click', function () {
$.ajax({
type: "POST", //HTTP method
url: "/WebServices/RequestHandler.asmx/HelloWorld",
contentType: "application/json; charset=utf-8",
dataType: "json",
data: "{}",
success: function (msg) {
console.log(msg);
},
error: function (xhr, textStatus, thrownerror) {
alert("something went wrong");
console.log(xhr.status);
console.log(xhr.responseText);
console.log(thrownerror);
}
});
});
});
这是我的网络服务：
[WebService(Namespace = "http://tempuri.org/")]
[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
[System.ComponentModel.ToolboxItem(false)]
// To allow this Web Service to be called from script, using ASP.NET AJAX, uncomment the following line.
[System.Web.Script.Services.ScriptService]
public class RequestHandler : System.Web.Services.WebService
{
private string connectionString = ConfigurationManager.ConnectionStrings["connection"].ConnectionString;
[WebMethod]
public static string HelloWorld()
{
return "hello";
}
}
如您所见，这是一种非常简单的方法，我只是想弄清楚发生了什么以及为什么它不起作用
是的，我确实省略了这两部分：
contentType: "application/json; charset=utf-8",
dataType: "json",
正如建议的数千次，但它根本没有帮助。
下面是在浏览器控制台中触发错误消息时的代码：
<!DOCTYPE html>
<html>
<head>
<title>Request format is unrecognized for URL unexpectedly ending in '/HelloWorld'.</title>
<meta name="viewport" content="width=device-width" />
<style>
body {font-family:"Verdana";font-weight:normal;font-size: .7em;color:black;}
p {font-family:"Verdana";font-weight:normal;color:black;margin-top: -5px}
b {font-family:"Verdana";font-weight:bold;color:black;margin-top: -5px}
H1 { font-family:"Verdana";font-weight:normal;font-size:18pt;color:red }
H2 { font-family:"Verdana";font-weight:normal;font-size:14pt;color:maroon }
pre {font-family:"Consolas","Lucida Console",Monospace;font-size:11pt;margin:0;padding:0.5em;line-height:14pt}
.marker {font-weight: bold; color: black;text-decoration: none;}
.version {color: gray;}
.error {margin-bottom: 10px;}
.expandable { text-decoration:underline; font-weight:bold; color:navy; cursor:hand; }
@media screen and (max-width: 639px) {
pre { width: 440px; overflow: auto; white-space: pre-wrap; word-wrap: break-word; }
}
@media screen and (max-width: 479px) {
pre { width: 280px; }
}
</style>
</head>
<body bgcolor="white">
<span><H1>Server Error in '/' Application.<hr width=100% size=1 color=silver></H1>
<h2> <i>Request format is unrecognized for URL unexpectedly ending in '/HelloWorld'.</i> </h2></span>
<font face="Arial, Helvetica, Geneva, SunSans-Regular, sans-serif ">
<b> Description: </b>An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.
<br><br>
<b> Exception Details: </b>System.InvalidOperationException: Request format is unrecognized for URL unexpectedly ending in '/HelloWorld'.<br><br>
<b>Source Error:</b> <br><br>
<table width=100% bgcolor="#ffffcc">
<tr>
<td>
<code>
An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.</code>
</td>
</tr>
</table>
<br>
<b>Stack Trace:</b> <br><br>
<table width=100% bgcolor="#ffffcc">
<tr>
<td>
<code><pre>
[InvalidOperationException: Request format is unrecognized for URL unexpectedly ending in '/HelloWorld'.]
System.Web.Services.Protocols.WebServiceHandlerFactory.CoreGetHandler(Type type, HttpContext context, HttpRequest request, HttpResponse response) +489329
System.Web.Services.Protocols.WebServiceHandlerFactory.GetHandler(HttpContext context, String verb, String url, String filePath) +212
System.Web.Script.Services.ScriptHandlerFactory.GetHandler(HttpContext context, String requestType, String url, String pathTranslated) +47
System.Web.MaterializeHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +346
System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +155
</pre></code>
</td>
</tr>
</table>
<br>
<hr width=100% size=1 color=silver>
<b>Version Information:</b> Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.0.30319.18408
</font>
</body>
</html>
<!--
[InvalidOperationException]: Request format is unrecognized for URL unexpectedly ending in '/HelloWorld'.
at System.Web.Services.Protocols.WebServiceHandlerFactory.CoreGetHandler(Type type, HttpContext context, HttpRequest request, HttpResponse response)
at System.Web.Services.Protocols.WebServiceHandlerFactory.GetHandler(HttpContext context, String verb, String url, String filePath)
at System.Web.Script.Services.ScriptHandlerFactory.GetHandler(HttpContext context, String requestType, String url, String pathTranslated)
at System.Web.HttpApplication.MaterializeHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)
-->
从上面的错误消息中我可以理解，url 有问题，不是"FORMATTED CORRECTLY" 什么的，我真的不知道我能做些什么来解决这个错误。
任何想法将不胜感激
提前致谢
更新 我还在某处读到默认情况下禁用 GET 和 POST 请求，因此我还将这些协议添加到我的 Web.config 文件中：
<configuration>
<system.web>
<webServices>
<protocols>
<add name="HttpGet"/>
<add name="HttpPost"/>
</protocols>
</webServices>
</system.web>
</configuration>
但我还是有同样的问题
【问题讨论】：
标签： jquery asp.net ajax web-services asmx