blocks|key|1250479|text|你可以查找HTTP状态码here+(或here)，这个错误告诉你：|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1250480|“服务器遇到意外情况，无法完成请求。”|1250481|你需要调试你的服务器。|1250482|entityMap|0|LINK|mutability|MUTABLE|url|http://www.w3.org/Protocols/HTTP/HTRESP.html|1|https://http.cat/^0|C|4|0|J|4|1|0|0|0^^$0|@$1|2|3|4|5|6|7|R|8|@]|9|@$A|S|B|T|1|U]|$A|V|B|W|1|X]]|C|$]]|$1|D|3|E|5|6|7|Y|8|@]|9|@]|C|$]]|$1|F|3|G|5|6|7|Z|8|@]|9|@]|C|$]]|$1|H|3|-4|5|6|7|10|8|@]|9|@]|C|$]]]|I|$J|$5|K|L|M|C|$N|O]]|P|$5|K|L|M|C|$N|Q]]]]

You can look up HTTP status codes <a href="http://www.w3.org/Protocols/HTTP/HTRESP.html" rel="nofollow noreferrer">here</a> (or <a href="https://http.cat" rel="nofollow noreferrer">here</a>), this error is telling you:

"The server encountered an unexpected condition which prevented it from fulfilling the request."

You need to debug your server.

blocks|key|1250541|text|我怀疑服务器方法在通过断点后抛出了一个异常。使用Firefox/Firebug或IE8开发人员工具查看从服务器获得的实际响应。如果有异常，你会得到YSOD的html，它应该可以帮助你找出在哪里查找。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1250542|还有一件事--你的数据属性应该是{}而不是"{}"，前者是一个空对象，而后者是一个字符串，作为查询参数是无效的。更好的是，如果你没有传递任何数据，就省略掉它。|1250543|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

I suspect that the server method is throwing an exception after it passes your breakpoint. Use Firefox/Firebug or the IE8 developer tools to look at the actual response you are getting from the server. If there has been an exception you'll get the YSOD html, which should help you figure out where to look.

One more thing -- your data property should be {} not "{}", the former is an empty object while the latter is a string that is invalid as a query parameter. Better yet, just leave it out if you aren't passing any data.

blocks|key|1465415|text|EventVwr中应该记录了一个事件(来自asp.net的警告)，它可以为您提供有关错误位置的更多详细信息。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1465416|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

There should be an event logged in the EventVwr (Warning from asp.net), which could provide you more details on where the error could be.

blocks|key|1465477|text|来自ASP.NET的500可能意味着在处理请求时抛出了一个未处理的异常。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1465478|我建议您将调试器附加到web服务器进程(假设您有访问权限)。|1465479|有一件事很奇怪:您向服务器发出POST请求，但没有传递任何数据(所有数据都在查询字符串中)。也许它应该是一个GET请求？|1465480|您还应该仔细检查URL是否正确。|1465481|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|J|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|K|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|L|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|M|8|@]|9|@]|A|$]]|$1|H|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|I|$]]

A 500 from ASP.NET probably means an unhandled exception was thrown at some point when serving the request.

I suggest you attach a debugger to the web server process (assuming you have access).

One strange thing: You make a POST request to the server, but you do not pass any data (everything is in the query string). Perhaps it should be a GET request instead?

You should also double check that the URL is correct.

blocks|key|1250712|text|你能发布你的方法的签名，应该接受这个帖子吗？|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1250713|此外，我还收到了相同的错误消息，可能是由于不同的原因。我的YSOD谈到了字典不包含非空值的值。我获取YSOD信息的方法是在处理错误返回的$.ajax函数中放置一个断点，如下所示：|1250714|<script+type="text/javascript"+language="javascript">
function+SubmitAjax(url,+message,+successFunc,+errorFunc)+{
++++$.ajax({
++++++++type:'POST',
++++++++url:url,
++++++++data:message,
++++++++contentType:+'application/json;+charset=utf-8',
++++++++dataType:+'json',
++++++++success:successFunc,
++++++++error:errorFunc
++++++++});

};|code-block|syntax|javascript|1250715|然后我的errorFunc+javascript是这样的：|1250716|function(request,+textStatus,+errorThrown)+{
++++++++$("#install").text("Error+doing+auto-installer+search,+proceed+with+ticket+submission\n"
++++++++%2Brequest.statusText);+}|1250717|使用IE，我去查看菜单，->脚本调试器，->+break+at+next+statement。然后去触发启动我的帖子的代码。这通常会让我深入到jQuery库中的某个地方，而不是我想要的地方，因为select下拉打开会触发jQuery。所以我点击了StepOver，然后实际的下一行也会中断，这就是我想要的地方。然后，VS进入该页面的客户端(动态)模式，我在$("#install")行上加了一个分隔符，这样我就可以看到(将鼠标悬停在调试上)请求中的内容，textStatus，errorThrown。请求。在request.ResponseText中，我看到了一条html消息：|offset|length|style|CODE|1250718|<title>The+parameters+dictionary+contains+a+null+entry+for+parameter+'appId'+of+non-nullable+type+'System.Int32'+for+method+'System.Web.Mvc.ContentResult+CheckForInstaller(Int32)'+in+'HLIT_TicketingMVC.Controllers.TicketController'.+An+optional+parameter+must+be+a+reference+type,+a+nullable+type,+or+be+declared+as+an+optional+parameter. Parameter+name:+parameters</title>|1250719|因此，请检查所有这些，并发布控制器方法签名，以防这是问题的一部分|1250720|entityMap^0|0|0|0|0|0|4Y|D|0|0|0^^$0|@$1|2|3|4|5|6|7|Y|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|Z|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|10|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|11|8|@]|9|@]|A|$]]|$1|K|3|L|5|F|7|12|8|@]|9|@]|A|$G|H]]|$1|M|3|N|5|6|7|13|8|@$O|14|P|15|Q|R]]|9|@]|A|$]]|$1|S|3|T|5|F|7|16|8|@]|9|@]|A|$G|H]]|$1|U|3|V|5|6|7|17|8|@]|9|@]|A|$]]|$1|W|3|-4|5|6|7|18|8|@]|9|@]|A|$]]]|X|$]]

Can you post the signature of your method that is supposed to accept this post?

Additionally I get the same error message, possibly for a different reason. My YSOD talked about the dictionary not containing a value for the non-nullable value. 
The way I got the YSOD information was to put a breakpoint in the $.ajax function that handled an error return as follows:

<pre><code>&lt;script type="text/javascript" language="javascript"&gt;
function SubmitAjax(url, message, successFunc, errorFunc) {
 $.ajax({
 type:'POST',
 url:url,
 data:message,
 contentType: 'application/json; charset=utf-8',
 dataType: 'json',
 success:successFunc,
 error:errorFunc
 });

};
</code></pre>

Then my errorFunc javascript is like this:

<pre><code>function(request, textStatus, errorThrown) {
 $("#install").text("Error doing auto-installer search, proceed with ticket submission\n"
 +request.statusText); }
</code></pre>

Using IE I went to view menu -> script debugger -> break at next statement.
Then went to trigger the code that would launch my post. This usually took me somewhere deep inside jQuery's library instead of where I wanted, because the select drop down opening triggered jQuery. So I hit StepOver, then the actual next line also would break, which was where I wanted to be. Then VS goes into client side(dynamic) mode for that page, and I put in a break on the <code>$("#install")</code> line so I could see (using mouse over debugging) what was in request, textStatus, errorThrown. request. In request.ResponseText there was an html message where I saw:

<pre><code>&lt;title&gt;The parameters dictionary contains a null entry for parameter 'appId' of non-nullable type 'System.Int32' for method 'System.Web.Mvc.ContentResult CheckForInstaller(Int32)' in 'HLIT_TicketingMVC.Controllers.TicketController'. An optional parameter must be a reference type, a nullable type, or be declared as an optional parameter.&lt;br&gt;Parameter name: parameters&lt;/title&gt;
</code></pre>

so check all that, and post your controller method signature in case that's part of the issue

blocks|key|1250746|text|我今天就面临着这个问题。对于这种错误，您不会从服务器获得任何响应，因此，很难定位问题。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1250747|但是我可以告诉你"500内部服务器错误“是服务器的错误而不是客户端的错误，你在服务器端脚本中得到了一个错误。用闭包注释掉代码闭包，然后再次运行它，你很快就会发现你遗漏了一个字符。|1250748|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

I just face this problem today. with this kind of error, you won't get any responses from server, therefore, it's very hard to locate the problem.

But I can tell you "500 internal server error" is error with server not client, you got an error in server side script. Comment out the code closure by closure and try to run it again, you'll soon find out you miss a character somewhere.

blocks|key|1465645|text|我今天也遇到了同样的事情。按照在获取Firefox的Firebug之前的建议，启用控制台并预览POST响应。这帮助我发现这个问题有多愚蠢。我的操作需要int类型的值，而我正在发送字符串。(ASP.NET+MVC2)|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1465646|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

I run into the same thing today. As suggested before get Firebug for Firefox, Enable Console and preview POST response. That helped me to find out how stupid the problem was. My action was expecting value of a type int and I was posting string. (ASP.NET MVC2)

blocks|key|1250872|text|如果有人使用codeigniter框架，问题可能是启用了csrf保护配置。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1250873|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

in case if someone using the codeigniter framework, the problem may be caused by the csrf protection config enabled.

blocks|key|1250914|text|我发现自己犯了这个错误。我在一个目录中配置了.htaccess重定向。当然，它会将ajax调用重新路由到($.post(../ajax.php))，所以它找不到实际的文件(导致500错误)。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1250915|我通过将ajax.php放在一个目录中来“修复”它(这样.htaccess就不会受到影响)。|1250916|entityMap^0|1H|J|0|S|9|0^^$0|@$1|2|3|4|5|6|7|J|8|@$9|K|A|L|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|M|8|@$9|N|A|O|B|C]]|D|@]|E|$]]|$1|H|3|-4|5|6|7|P|8|@]|D|@]|E|$]]]|I|$]]

I found myself having this error to. I had .htaccess redirect configured in a directory. Well it reroutes ajax calls to ofcourse (<code>$.post(../ajax.php)</code>), so it couldn't find the actual file (resulting in 500 error).

I 'fixed' it by placing the ajax.php in a directory (So <code>.htaccess</code> didn't affect).

blocks|key|1465844|text|我自己也有这个问题，即使在我的例子中找不到原因，但当我从POST改为GET时，problem+500错误消失了！|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1465845|+type:'POST'|code-block|syntax|javascript|1465846|entityMap^0|S|4|Y|3|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]|$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|R|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|S|8|@]|D|@]|E|$]]]|L|$]]

I just had this problem myself, even though i couldn't find the reason for it in my case, when changing from <code>POST</code> to <code>GET</code>, the problem 500 error disappeared!

<pre><code> type:'POST'
</code></pre>

blocks|key|1465872|text|这是通过Ajax请求获取数据的简单代码|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1465873|$.ajax({
++++type:+"POST",
++++url:+"InlineNotes/Note.ashx",
++++data:+'{"id":"'+%2B+noteid%2B'"}',
++++contentType:+"application/json;+charset=utf-8",
++++dataType:+"json",
++++success:+function(data)+{
++++++++alert(data.d);
++++},
++++error:+function(data){
++++++++alert("fail");
++++}
});|code-block|syntax|javascript|1465874|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

This is Ajax Request Simple Code To Fetch Data Through Ajax Request

<pre><code>$.ajax({
 type: "POST",
 url: "InlineNotes/Note.ashx",
 data: '{"id":"' + noteid+'"}',
 contentType: "application/json; charset=utf-8",
 dataType: "json",
 success: function(data) {
 alert(data.d);
 },
 error: function(data){
 alert("fail");
 }
});
</code></pre>

blocks|key|1251116|text|当使用启用了CSRF保护的CodeIgniter框架时，在可能发生ajax+POST的每个页面中加载以下脚本：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1251117|$(function(){
++++$.ajaxSetup({
++++++++data:+{
++++++++++++<?php+echo+$this->config->item('csrf_token_name');+?>:+$.cookie('<?php+echo+$this->config->item('csrf_cookie_name');+?>')
++++++++}
++++});
});|code-block|syntax|javascript|1251118|要求:+jQuery和jQuery.cookie插件|1251119|资料来源：https://stackoverflow.com/a/7154317/2539869和http://jerel.co/blog/2012/03/a-simple-solution-to-codeigniter-csrf-protection-and-ajax|offset|length|1251120|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/a/7154317/2539869|1|http://jerel.co/blog/2012/03/a-simple-solution-to-codeigniter-csrf-protection-and-ajax^0|0|0|0|5|17|0|1D|2E|1|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|X|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Y|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|Z|8|@]|9|@$K|10|L|11|1|12]|$K|13|L|14|1|15]]|A|$]]|$1|M|3|-4|5|6|7|16|8|@]|9|@]|A|$]]]|N|$O|$5|P|Q|R|A|$S|T]]|U|$5|P|Q|R|A|$S|V]]]]

When using the CodeIgniter framework with CSRF protection enabled, load the following script in every page where an ajax POST may happen:

<pre><code>$(function(){
 $.ajaxSetup({
 data: {
 &lt;?php echo $this-&gt;config-&gt;item('csrf_token_name'); ?&gt;: $.cookie('&lt;?php echo $this-&gt;config-&gt;item('csrf_cookie_name'); ?&gt;')
 }
 });
});
</code></pre>

Requires: jQuery and jQuery.cookie plugin

Sources: <a href="https://stackoverflow.com/a/7154317/2539869">https://stackoverflow.com/a/7154317/2539869</a> and <a href="http://jerel.co/blog/2012/03/a-simple-solution-to-codeigniter-csrf-protection-and-ajax" rel="nofollow noreferrer">http://jerel.co/blog/2012/03/a-simple-solution-to-codeigniter-csrf-protection-and-ajax</a>

blocks|key|1251172|text|我遇到这个问题是因为我调用ajax+post的页面有EnableViewState="false"和EnableViewStateMac="false"，但没有调用的页面。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1251173|当我把这个放在两个页面上时，一切都开始工作了。当我看到MAC地址异常时，我怀疑到了这一点。|1251174|entityMap^0|Q|N|1E|Q|0|0^^$0|@$1|2|3|4|5|6|7|J|8|@$9|K|A|L|B|C]|$9|M|A|N|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|O|8|@]|D|@]|E|$]]|$1|H|3|-4|5|6|7|P|8|@]|D|@]|E|$]]]|I|$]]

I had this problem because the page I called ajax post from had <code>EnableViewState="false"</code> and <code>EnableViewStateMac="false"</code> but not the page called. 

When I put this on both pages everything started to work. I suspected this when I saw MAC address exception.

blocks|key|1251251|text|您传递给服务器的JSON数据应该与您在客户端形成的JSON数据同名。例如：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1251252|var+obj+=+{++Id:+$('#CompanyId').val(),
+++++++++++++Name:+$("#CompanyName").val()
++++++++++++};

$.Ajax(data:+obj,
url:+"home/InsertCompany".....|code-block|syntax|javascript|1251253|如果名称不同，例如：|1251254|[HttpPost]
public+ActionResult+InsertCompany(Int32+Id,+string+WrongName)
{
}|1251255|您将得到此错误。|1251256|如果您没有传递数据，请从AJAX请求中删除data属性。|1251257|entityMap^0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|S|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|U|8|@]|9|@]|A|$]]|$1|M|3|N|5|6|7|V|8|@]|9|@]|A|$]]|$1|O|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|P|$]]

The JSON data you are passing to the server should have same name as you forming in client side.
Ex:

<pre><code>var obj = { Id: $('#CompanyId').val(),
 Name: $("#CompanyName").val()
 };

$.Ajax(data: obj,
url: "home/InsertCompany".....
</code></pre>

If the name is different, ex: 

<pre><code>[HttpPost]
public ActionResult InsertCompany(Int32 Id, string WrongName)
{
}
</code></pre>

You will get this error.

If you are not passing the data, remove the data attribute from AJAX request.

blocks|key|1251305|text|如前所述，我认为您的返回字符串数据非常长。所以JSON格式已经被破坏了。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1251306|这个问题还有其他的解决方法。您应该这样更改JSON数据的最大大小：|1251307|打开Web.Config文件并将这些行粘贴到配置节|1251308|<system.web.extensions>
++<scripting>
++++<webServices>
++++++<jsonSerialization+maxJsonLength="50000000"/>
++++</webServices>
++</scripting>
</system.web.extensions>|code-block|syntax|javascript|1251309|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|N|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|O|8|@]|9|@]|A|$]]|$1|F|3|G|5|H|7|P|8|@]|9|@]|A|$I|J]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

As mentioned I think your return string data is very long. so the JSON format has been corrupted. 

There's other way for this problem. You should change the max size for JSON data in this way :

Open the Web.Config file and paste these lines into the configuration section

<pre><code>&lt;system.web.extensions&gt;
 &lt;scripting&gt;
 &lt;webServices&gt;
 &lt;jsonSerialization maxJsonLength="50000000"/&gt;
 &lt;/webServices&gt;
 &lt;/scripting&gt;
&lt;/system.web.extensions&gt;
</code></pre>

blocks|key|1466195|text|在服务器端使用Try+Catch块，并在catch块中将异常错误传递回客户端。这应该会给你一个有用的错误信息。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1466196|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

Use a Try Catch block on your server side and in the catch block pass back the exception error to the client. This should give you a helpful error message.

blocks|key|1251471|text|我在AJAX代码中也遇到过类似的问题，它偶尔会返回"500内部服务器错误“。我通过增加"fastCGI“RequestTimeout和ActivityTimeout的值解决了这个问题。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1251472|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

I have had similar issues with AJAX code that sporadically returns the "500 internal server error". I resolved the problem by increasing the "fastCGI" RequestTimeout and ActivityTimeout values.

blocks|key|1466359|text|对我来说，错误出现在我发送请求的php文件中。数据库连接出错。修复php代码后，错误已解决。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1466360|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

For me, the error was in php file to which i was sending request.
Error was in database connectivity. After fixing the php code, error resolved.

blocks|key|1466457|text|我来晚了，但我遇到了这个问题，我发现这是我的PHP代码中的一个错误(在我的例子中，是对数据库的select语法)。根据我的经验，通常这个错误500是使用语法来处理的。换句话说："peopleware“问题！:D|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1466458|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

I'm late on this, but I was having this issue and what I've learned was that it was an error on my PHP code (in my case the syntax of a select to the db). Usually this error 500 is something to do using syntax - in my experience. In other word: "peopleware" issue! :D

blocks|key|1466536|text|作为对“格式错误的JSON”答案的补充，如果您正在运行的查询返回一个对象或任何阻止数据序列化的内容，您将收到此错误。您应该始终确保您有JSON，并且只有JSON在您的操作方法的末尾，或者您从中获取数据的任何东西的末尾。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1466537|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

As an addition to the "malformed JSON" answer, if the query you are running returns an object or anything that prevents the data to be serialised, you will get this error. You should always be sure you have JSON and only JSON at the end of your action method or whatever it is you are getting the data from.

blocks|key|1466596|text|通常情况下，您的属性不是完全正确的，或者您的服务器处理有问题。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1466597|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

Usually your property is not completely right or something wrong with your server processing.

blocks|key|1251847|text|尝试这个标头：{‘X-Requested+With’：'XMLHttpRequest‘}，在ajax中，将类型设置在url之上|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1251848|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

try this
headers: {
'X-Requested-With': 'XMLHttpRequest'
},
in ajax,
set type above the url

blocks|key|1466722|text|在我的例子中，错误与实体框架的工作方式有关。我在数据库中的两个表之间有一个一对多的关系，当我使用ajax+post从具有外键的表中获取数据时，它也在获取相关的外键表数据，因为默认情况下启用了lazyloading。正因为如此，Json+return对数据格式感到困惑，并抛出这个错误。所以我不得不在linq查询之前使用_wfocEntities.Configuration.LazyLoadingEnabled+=+false;这一行，它解决了我的问题。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1466723|entityMap^0|4F|1J|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|K|8|@]|D|@]|E|$]]]|G|$]]

In my case the error was related to the way entity framework works. I had a one to many relationship between two tables in my database and when I was bringing data from the table which has the foreign key using ajax post it was also fetching the related foreign key table data because lazyloading was enabled by default. because of that , Json return got confused about the data format and was throwing this error.
So I had to use
<code>_wfocEntities.Configuration.LazyLoadingEnabled = false;</code> this line before my linq query and it solved my issue.

I am trying to perform this AJAX post but for some reason I am getting a server 500 error. I can see it hit break points in the controller. So the problem seems to be on the callback. Anyone?

<pre><code>$.ajax({
 type: "POST",
 url: "InlineNotes/Note.ashx?id=" + noteid,
 data: "{}",
 dataType: "json",

 success: function(data) {
 alert(data[1]);
 },
 error: function(data){
 alert("fail");
 }
});
</code></pre>

This is the string that should be returned:

<pre><code>{status:'200', text: 'Something'}
</code></pre>

JQuery Ajax Post results in 500 Internal Server Error

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我正在尝试执行这篇AJAX帖子，但是由于某种原因，我得到了一个服务器500错误。我可以看到它命中了控制器中的断点。因此，问题似乎出在回调上。有没有人？$.ajax({    type: "POST",    url: "InlineNotes/Note.ashx?id=" + noteid,    data: "{}"...

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