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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
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 . . . }
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