我有麻烦使PUT和DELETE CORS请求到其他域上的Web API.
我已经通过http://www.asp.net/web-api/overview/security/enabling-cross-origin-requests-in-web-api#create-webapi-project教程编写了API.
GET和POST请求工作正常,但DELETE和PUT不.我收到这个消息：
Failed to load resource: the server responded with a status of 405 (Method Not Allowed) Failed to load resource: No 'Access-Control-Allow-Origin' header is present on the requested resource.
当我添加代码到WebConfig建议在CORS support for PUT and DELETE with ASP.NET Web API,我只得到第一个错误.
有人可以帮我吗
解决方法
您可以添加一个处理程序来处理这种类型的请求.
创建一个派生自“DelegatingHandler”的类：
public class PreflightRequestsHandler : DelegatingHandler
{
protected override Task<HttpResponseMessage> SendAsync(HttpRequestMessage request,CancellationToken cancellationToken)
{
if (request.Headers.Contains("Origin") && request.Method.Method.Equals("OPTIONS"))
{
var response = new HttpResponseMessage { StatusCode = HttpStatusCode.OK };
// Define and add values to variables: origins,headers,methods (can be global)
response.Headers.Add("Access-Control-Allow-Origin",origins);
response.Headers.Add("Access-Control-Allow-Headers",headers);
response.Headers.Add("Access-Control-Allow-Methods",methods);
var tsc = new TaskCompletionSource<HttpResponseMessage>();
tsc.SetResult(response);
return tsc.Task;
}
return base.SendAsync(request,cancellationToken);
}
}
后来在WebApiconfig.cs中的Register方法添加：
public static void Register(HttpConfiguration config)
{
// Define and add values to variables: origins,methods (can be global)
// Enable global CORS
config.EnableCors(new EnableCorsAttribute(origins,methods));
// Add handler to deal with preflight requests,this is the important part
config.MessageHandlers.Add(new PreflightRequestsHandler()); // Defined above
.
.
.
}
