blocks|key|1154157|text|当使用<button+onclick="">submit</button>时，这里也有同样的问题。然后使用<input+type="button"+onclick="">进行求解|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1154158|entityMap^0|3|Y|1H|W|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]|$9|K|A|L|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|M|8|@]|D|@]|E|$]]]|G|$]]

Same problem here when using <code>&lt;button onclick=""&gt;submit&lt;/button&gt;</code>. Then solved by using <code>&lt;input type="button" onclick=""&gt;</code>

blocks|key|1153710|text|状态码0表示请求的url不可达。通过将http://something/something更改为https://something/something，对我起作用了。当状态码为0时，IE会抛出一个错误，显示“权限被拒绝”，而其他浏览器则不会。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1153711|entityMap|0|LINK|mutability|MUTABLE|url|http://something/something|1|https://something/something^0|J|Q|0|1C|R|1|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@$A|O|B|P|1|Q]|$A|R|B|S|1|T]]|C|$]]|$1|D|3|-4|5|6|7|U|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]|L|$5|G|H|I|C|$J|M]]]]

Status code 0 means the requested url is not reachable. By changing <a href="http://something/something" rel="noreferrer">http://something/something</a> to <a href="https://something/something" rel="noreferrer">https://something/something</a> worked for me. IE throwns an error saying "permission denied" when the status code is 0, other browsers dont.

blocks|key|1369138|text|值得注意的是，即使在由cookie定义的会话中，ajax调用也可能失败，该cookie的前缀是www。当你调用你的php脚本时，比如没有www。前缀，则调用将失败，反之亦然。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1369139|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|$]]

It is important to note, that ajax calls can fail even within a session which is defined by a cookie with a certain domain prefixed with www. When you then call your php script e.g. without the www. prefix in the url, the call will fail and viceversa, too.

blocks|key|1153771|text|因为当你在谷歌上搜索ajax+status+0时，它会显示出来，我想留下一些提示，只是浪费了我几个小时的时间……我使用ajax来调用一个PHP服务，这个服务恰好是Phil的Codeigniter的REST_Controller+(不确定这和它有没有关系)，并且一直得到状态0，readystate+0，这让我抓狂。我正在调试它，并注意到当我回显并返回而不是退出消息时，我将获得成功。最后，我关闭了调试，并尝试了一下，它起作用了。似乎PHP的xDebug调试器以某种方式修改了响应。如果您使用的是PHP调试器，请尝试将其关闭，看看这是否有帮助。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1153772|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|$]]

Because this shows up when you google ajax status 0 I wanted to leave some tip that just took me hours of wasted time... I was using ajax to call a PHP service which happened to be Phil's REST_Controller for Codeigniter (not sure if this has anything to do with it or not) and kept getting status 0, readystate 0 and it was driving me nuts. I was debugging it and noticed when I would echo and return instead of exit the message I'd get a success. Finally I turned debugging off and tried and it worked. Seems the xDebug debugger with PHP was somehow modifying the response. If your using a PHP debugger try turning it off to see if that helps.

blocks|key|1368955|text|This+article帮了我我通过AJAX提交表单，忘记使用return+false+(在我的ajax请求之后)，这导致了经典的表单提交，但奇怪的是它并没有完成。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1368956|entityMap|0|LINK|mutability|MUTABLE|url|http://markos.gaivo.net/articles/xmlhttprequest-and-status-0.html^0|V|C|0|C|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@$9|O|A|P|B|C]]|D|@$9|Q|A|R|1|S]]|E|$]]|$1|F|3|-4|5|6|7|T|8|@]|D|@]|E|$]]]|G|$H|$5|I|J|K|E|$L|M]]]]

<a href="http://markos.gaivo.net/articles/xmlhttprequest-and-status-0.html" rel="nofollow noreferrer">This article</a> helped me. I was submitting form via AJAX and forgotten to use <code>return false</code> (after my ajax request) which led to classic form submission but strangely it was not completed.

blocks|key|1153972|text|我发现了另一种情况，jquery给出的状态码为0+--如果由于某种原因没有定义XMLHttpRequest，您会得到这个错误。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1153973|显然，这通常不会发生在网络上，但每晚firefox构建中的一个bug导致了我正在编写的一个附加组件中突然出现了这个问题。:)|1153974|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 found another case where jquery gives you status code 0 -- if for some reason XMLHttpRequest is not defined, you'll get this error.

Obviously this won't normally happen on the web, but a bug in a nightly firefox build caused this to crop up in an add-on I was writing. :)

blocks|key|1369071|text|“意外”表单提交正是我遇到的问题。我只是完全删除了表单标签，这似乎解决了这个问题。谢谢大家！|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1369072|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|$]]

"Accidental" form submission was exactly the problem I was having. I just removed the FORM tags altogether and that seems to fix the problem. Thank you, everybody!

blocks|key|1369274|text|我也有同样的问题，它与浏览器阻止XSS+(跨站点脚本)有关。我设法让它在服务器上工作。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1369275|看一下：http://www.daniweb.com/web-development/javascript-dhtml-ajax/threads/282972/why-am-i-getting-xmlhttprequest.status0|offset|length|1369276|entityMap|0|LINK|mutability|MUTABLE|url|http://www.daniweb.com/web-development/javascript-dhtml-ajax/threads/282972/why-am-i-getting-xmlhttprequest.status0^0|0|4|37|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|O|8|@]|9|@$D|P|E|Q|1|R]]|A|$]]|$1|F|3|-4|5|6|7|S|8|@]|9|@]|A|$]]]|G|$H|$5|I|J|K|A|$L|M]]]]

I had the same problem, and it was related to XSS (cross site scripting) block by the browser. I managed to make it work using a server.

Take a look at: <a href="http://www.daniweb.com/web-development/javascript-dhtml-ajax/threads/282972/why-am-i-getting-xmlhttprequest.status0" rel="nofollow">http://www.daniweb.com/web-development/javascript-dhtml-ajax/threads/282972/why-am-i-getting-xmlhttprequest.status0</a>

blocks|key|1369197|text|我们有类似的问题-+jquery+ajax调用的状态代码0-我们花了一整天的时间来诊断它。因为还没有人提到这个原因，所以我想我来分享一下。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1369198|在我们的例子中，问题是HTTP服务器崩溃。PHP中的一些bug破坏了Apache，所以在客户端它看起来是这样的：|1369199|mirek@toccata:~$+telnet+our.server.com+80
Trying+180.153.xxx.xxx...
Connected+to+our.server.com.
Escape+character+is+'%5E]'.
GET+/test.php+HTTP/1.0
Host:+our.server.com

Connection+closed+by+foreign+host.
mirek@toccata:~$+|code-block|syntax|javascript|1369200|test.php包含崩溃代码的地方。未从服务器返回任何数据(甚至不是标头)+=>+ajax调用已中止，状态为0。|1369201|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|N|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|O|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|P|8|@]|9|@]|A|$]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

We had similar problem - status code 0 on jquery ajax call - and it took us whole day to diagnose it. Since no one had mentioned this reason yet, I thought I'll share.

In our case the problem was HTTP server crash. Some bug in PHP was blowing Apache, so on client end it looked like this:

<pre><code>mirek@toccata:~$ telnet our.server.com 80
Trying 180.153.xxx.xxx...
Connected to our.server.com.
Escape character is '^]'.
GET /test.php HTTP/1.0
Host: our.server.com

Connection closed by foreign host.
mirek@toccata:~$ 
</code></pre>

where test.php contained the crashing code.
No data returned from the server (not even headers) => ajax call was aborted with status 0.

blocks|key|1154315|text|在我的例子中，这是由于在http://127.0.0.1:8000/下运行我的django服务器，但将ajax调用发送到http://localhost:8000/造成的。即使您希望它们映射到相同的地址，它们也不会，因此请确保您没有将请求发送到localhost。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1154316|entityMap^0|C|M|1O|M|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]|$9|K|A|L|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|M|8|@]|D|@]|E|$]]]|G|$]]

In my case, it was caused by running my django server under <code>http://127.0.0.1:8000/</code> but sending the ajax call to <code>http://localhost:8000/</code>. Even though you would expect them to map to the same address, they don't so make sure you're not sending your requests to localhost.

blocks|key|1153812|text|在我的例子中，在ajax设置中设置url:+''将导致ie8中的状态代码为0。看起来ie就是不能容忍这样的设置。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1153813|entityMap^0|H|7|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, setting <code>url: ''</code> in ajax settings would result in a status code 0 in ie8.. It seems ie just doesn't tolerate such a setting.

blocks|key|1369363|text|对我来说，这个问题是由托管公司(Godaddy)将拥有大量响应数据(超过数万字节)的POST操作视为某种安全威胁造成的。如果在一分钟内超过6次，则主机将拒绝在接下来的一分钟内执行响应POST请求的PHP代码。我不能完全确定主机做了什么，但我确实看到，使用tcpdump时，TCP重置数据包作为对来自浏览器的POST请求的响应。这导致在jqXHR对象中返回的http状态码为0。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1369364|更改POST操作以解决此问题。目前还不清楚为什么Godaddy会施加这样的限制，但更改代码比更改主机更容易。|1369365|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|$]]

For me, the problem was caused by the hosting company (Godaddy) treating POST operations which had substantial response data (anything more than tens of kilobytes) as some sort of security threat. If more than 6 of these occurred in one minute, the host refused to execute the PHP code that responded to the POST request during the next minute. I'm not entirely sure what the host did instead, but I did see, with tcpdump, a TCP reset packet coming as the response to a POST request from the browser. This caused the http status code returned in a jqXHR object to be 0.

Changing the operations from POST to GET fixed the problem. It's not clear why Godaddy impose this limit, but changing the code was easier than changing the host.

blocks|key|1369432|text|我想我知道是什么导致了这个错误。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1369433|在google+chrome中有一个内置的功能，可以防止对google+chrome扩展的ddos攻击。|1369434|当ajax请求连续返回500%2B状态错误时，它将开始限制请求。|1369435|因此，可以在以下请求中接收状态0。|1369436|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|$]]

I think I know what may cause this error.

In google chrome there is an in-built feature to prevent ddos attacks for google chrome extensions.

When ajax requests continuously return 500+ status errors, it starts to throttle the requests.

Hence it is possible to receive status 0 on following requests.

blocks|key|1369476|text|试图以最愚蠢的理由来赢得奖品。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1369477|忘记打电话|1369478|xmlhttp.send();+//yes,+you+need+this+pivotal+line!|code-block|syntax|javascript|1369479|是的，我仍然从'open‘调用中得到零的状态返回。|1369480|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|N|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|O|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|P|8|@]|9|@]|A|$]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

In an attempt to win the prize for most dumbest reason for the problem described.

Forgetting to call 

<pre><code>xmlhttp.send(); //yes, you need this pivotal line!
</code></pre>

Yes, I was still getting status returns of zero from the 'open' call.

blocks|key|1369550|text|在我的例子中，我只在Safari+Mobile上得到了这个。问题是我使用的是完整的网址(http://example.com/whatever.php)而不是相对的网址(whatever.php)。虽然这没有任何意义，但这不可能是一个XSS问题，因为我的站点托管在http://example.com上。我猜Safari会查看http部分，并自动将其标记为不安全的请求，而不检查URL的其余部分。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1369551|entityMap|0|LINK|mutability|MUTABLE|url|http://example.com/whatever.php|1|http://example.com/^0|18|V|0|3O|I|1|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@$A|O|B|P|1|Q]|$A|R|B|S|1|T]]|C|$]]|$1|D|3|-4|5|6|7|U|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]|L|$5|G|H|I|C|$J|M]]]]

In my case, I was getting this but only on Safari Mobile. The problem is that I was using the full URL (<a href="http://example.com/whatever.php" rel="nofollow noreferrer">http://example.com/whatever.php</a>) instead of the relative one (whatever.php). This doesn't make any sense though, it can't be a XSS issue because my site is hosted at <a href="http://example.com" rel="nofollow noreferrer">http://example.com</a>. I guess Safari looks at the http part and automatically flags it as an insecure request without inspecting the rest of the URL.

blocks|key|1369578|text|在我的故障排除中，我发现这个AJAX+xmlhttpRequest.status+==+0可能意味着客户端调用还没有到达服务器，但由于客户端的问题而失败。如果响应来自服务器，则状态必须是1xx/2xx/3xx/4xx/5xx+HTTP响应代码之一。此后，故障排除应集中在客户端问题上，可能是internet网络连接故障，也可能是上面@Langdon描述的问题之一。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1369579|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 my troubleshooting, I found this AJAX xmlhttpRequest.status == 0 could mean the client call had NOT reached the server yet, but failed due to issue on the client side. If the response was from server, then the status must be either those 1xx/2xx/3xx/4xx/5xx HTTP Response code. Henceforth, the troubleshooting shall focus on the CLIENT issue, and could be internet network connection down or one of those described by @Langdon above.

blocks|key|1369527|text|在发起请求时观察浏览器控制台，如果您看到“Same+Origin+Policy+disallows+the+remote+resource+at+http+ajax.....+reason:+cors+header‘Access-Control-Allow-Origin’missing”，则需要在响应header中添加"Access-Control-Allow-Origin“。exa:在java中，你可以像response+(+"*")那样设置，其中response.setHeader("Access-Control-Allow-Origin"，是HttpServletResponse。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1369528|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|$]]

Observe the browser Console while making the request, if you are seeing "The Same Origin Policy disallows reading the remote resource at http ajax..... reason: cors header ‘access-control-allow-origin’ missing" then you need to add "Access-Control-Allow-Origin" in response header. exa: in java you can set this like response.setHeader("Access-Control-Allow-Origin", "*") where response is HttpServletResponse.

blocks|key|1154528|text|在我的例子中，我做了一个Firefox插件，忘记添加我想要ajax的url/domain的权限，希望这能节省一些人的时间。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1154529|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 my case, I was making a Firefox Add-on and forgot to add the permission for the url/domain I was trying to ajax, hope this saves someone a lot of time.

For some reason, while using AJAX (with my <a href="/questions/tagged/dashcode" class="post-tag" title="show questions tagged &#39;dashcode&#39;" rel="tag">dashcode</a> developed application) the browser just stops uploading and returns status codes of <code>0</code>. Why does this happen?

Why is AJAX returning HTTP status code 0?

由于某些原因，在使用AJAX (与我的开发的应用程序一起使用)时，浏览器只是停止上传并返回0的状态代码。这一切为什么要发生？

问为什么AJAX返回HTTP状态代码0？
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