.NET框架4.0 - 在CORS的WebAPI实施 [英] CORS implementation in WEBAPI - .net framework 4.0
问题描述
我有点新的的WebAPI,我想在网页API实现CORS(跨源资源共享)。我指的是这个微软链接。他们利用安装的NuGet包
I am bit new to webAPi and I want to implement CORS (Cross Origin Resource Sharing) on Web API. I am referring to this Microsoft link. They install a Nuget package using
PM> Install-Package Microsoft.AspNet.Cors -Version 5.0.0-rc1 -Pre
不过,我使用的.NET Framework 4.0,这是行不通的。后来我用这个命令的NuGet:
However, I am using .NET Framework 4.0 and it is not working. Afterwards I used this Nuget command:
Install-Package Microsoft.AspNet.WebApi -Version 4.0.20710
但它不包含CORS类。所以,做我们必须实现CORS任何其他不同的方式?
But it does not contain the CORS class. So, do we have any other different way to implement CORS?
推荐答案
我用下面为我工作正常(以为不能确定4.0客户端配置文件位):
I use the following and works fine for me (thought not sure about the "4.0 client profile" bit) :
public class CorsHandler : DelegatingHandler
{
private const string Origin = "Origin";
private const string AccessControlRequestMethod = "Access-Control-Request-Method";
private const string AccessControlRequestHeaders = "Access-Control-Request-Headers";
private const string AccessControlAllowOrigin = "Access-Control-Allow-Origin";
private const string AccessControlAllowMethods = "Access-Control-Allow-Methods";
private const string AccessControlAllowHeaders = "Access-Control-Allow-Headers";
protected override Task<HttpResponseMessage> SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
{
bool isCorsRequest = request.Headers.Contains(Origin);
bool isPreflightRequest = request.Method == HttpMethod.Options;
if (isCorsRequest)
{
if (isPreflightRequest)
{
var response = new HttpResponseMessage(HttpStatusCode.OK);
response.Headers.Add(AccessControlAllowOrigin, request.Headers.GetValues(Origin).First());
string accessControlRequestMethod = request.Headers.GetValues(AccessControlRequestMethod).FirstOrDefault();
if (accessControlRequestMethod != null)
{
response.Headers.Add(AccessControlAllowMethods, accessControlRequestMethod);
}
string requestedHeaders = string.Join(", ", request.Headers.GetValues(AccessControlRequestHeaders));
if (!string.IsNullOrEmpty(requestedHeaders))
{
response.Headers.Add(AccessControlAllowHeaders, requestedHeaders);
}
var tcs = new TaskCompletionSource<HttpResponseMessage>();
tcs.SetResult(response);
return tcs.Task;
}
return base.SendAsync(request, cancellationToken).ContinueWith(t =>
{
HttpResponseMessage resp = t.Result;
resp.Headers.Add(AccessControlAllowOrigin, request.Headers.GetValues(Origin).First());
return resp;
});
}
return base.SendAsync(request, cancellationToken);
}
}
记住你的应用程序开始进行注册(我在Global.asax中)
Remember to register it in you app start (mine in global.asax)
GlobalConfiguration.Configuration.MessageHandlers.Add(new CorsHandler());
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