因此，我可以使用 CORS 成功地对我的服务进行 GET 调用。但是，POST、PUT 和 DELETE 操作的预检级别肯定有问题。但是，据我所知，我的服务器响应 OPTIONS 查询返回的标头响应是正确的，并且与中描述的匹配
这是我的 javascript 代码，在 JQuery 1.6.4 中使用 $.ajax。
$.ajax({
url: 'http://myhome:8080/TaskApproval/resources/tasks/2',
context: this,
data: '<?xml version="1.0" encoding="UTF-8"?> <task> <description>Get carrots from the grocery store</description><originator>Chris</originator><subject>Get Carrots !!</subject><taskId>2</taskId> </task> ',
timeout: 30000,
type: 'PUT',
contentType: 'application/xml',
success: function(response) {
alert(response);
result = response;
},
error: function(xhr) {
alert('Error! Status = ' + xhr.status + " Message = " + xhr.statusText);
}
});
现在，这就是我的 HTTP Trail 的样子，由 Firebug 提供。
要求：
OPTIONS /TaskApproval/resources/tasks/2 HTTP/1.1
Host: widgethome:8080
User-Agent: Mozilla/5.0 (Windows NT 5.1; rv:6.0.2) Gecko/20100101 Firefox/6.0.2
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: en-us,en;q=0.5
Accept-Encoding: gzip, deflate
Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7
Connection: keep-alive
Origin: http://localhost:8080
Access-Control-Request-Method: PUT
Access-Control-Request-Headers: content-type
回复：
HTTP/1.1 200 OK
X-Powered-By: Servlet/3.0
Server: GlassFish v3
Allow: OPTIONS,GET,DELETE,HEAD,PUT, POST
Access-Control-Allow-Origin: *
Access-Control-Allow-Methods: POST, GET, OPTIONS, PUT, DELETE
Access-Control-Max-Age: 1000
Access-Control-Allow-Headers: *
Content-Type: application/xml
Content-Length: 2792
Date: Wed, 28 Sep 2011 18:21:11 GMT
然后没有 PUT（或 POST 或 DELETE），我只是得到了那个烦人的无帮助的 xhr 对象，如下所示：
readyState 0
responseText ""
status 0
statusText "error"
我很困惑，如果我随后在我的 Ajax 调用中删除 contentType，并且它为每个应用程序发送了一个无效的内容类型，浏览器实际上会发送我的 PUT 请求，该请求失败，因为 Content-Type 不是 application/xml。见下文：
$.ajax({
url: 'http://myhome:8080/TaskApproval/resources/tasks/2',
data: '<?xml version="1.0" encoding="UTF-8"?> <task> <description>Get carrots from the grocery store</description><originator>Chris</originator><subject>Get Carrots !!</subject><taskId>2</taskId> </task> ',
timeout: 30000,
type: 'PUT',
//contentType: 'application/xml',
success: function(response) {
alert(response);
result = response;
},
error: function(xhr) {
alert('Error! Status = ' + xhr.status + " Message = " + xhr.statusText);
}
});
导致这个 HTTP 跟踪，再次由 Firebug 提供：
选项请求：
OPTIONS /TaskApproval/resources/tasks/2 HTTP/1.1
Host: myhome:8080
User-Agent: Mozilla/5.0 (Windows NT 5.1; rv:6.0.2) Gecko/20100101 Firefox/6.0.2
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: en-us,en;q=0.5
Accept-Encoding: gzip, deflate
Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7
Connection: keep-alive
Origin: http://localhost:8080
Access-Control-Request-Method: PUT
选项响应：
HTTP/1.1 200 OK
X-Powered-By: Servlet/3.0
Server: GlassFish v3
Allow: OPTIONS,GET,DELETE,HEAD,PUT, POST
Access-Control-Allow-Origin: *
Access-Control-Allow-Methods: POST, GET, OPTIONS, PUT, DELETE
Access-Control-Max-Age: 1000
Access-Control-Allow-Headers: *
Content-Type: application/xml
Content-Length: 2792
Date: Wed, 28 Sep 2011 18:26:23 GMT
提出请求：
PUT /TaskApproval/resources/tasks/2 HTTP/1.1
Host: myhome:8080
User-Agent: Mozilla/5.0 (Windows NT 5.1; rv:6.0.2) Gecko/20100101 Firefox/6.0.2
Accept: */*
Accept-Language: en-us,en;q=0.5
Accept-Encoding: gzip, deflate
Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7
Connection: keep-alive
Content-Type: application/x-www-form-urlencoded; charset=UTF-8
Referer: http://localhost:8080/TaskApproval/crossdomain.html
Content-Length: 197
Origin: http://localhost:8080
放回应：
HTTP/1.1 415 Unsupported Media Type
X-Powered-By: Servlet/3.0
Server: GlassFish v3
Content-Type: text/html
Content-Length: 1069
Date: Wed, 28 Sep 2011 18:26:23 GMT
415 是有道理的，因为我不支持内容 application/x-www-form-urlencoded，只支持 application/xml。我不明白为什么正确设置 Content-Type 会阻止 PUT？
感谢您的任何见解！我已经在互联网上搜索了很长时间，但找不到解决此问题的方法。