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[英]Response to preflight request doesn't pass access control check: The value of the 'Access-Control-Allow-Credentials' header in the response is ''
[英]How to handel error “Response to preflight request doesn't pass access control check: The value of the 'Access-Control-Allow-Credentials'”
我正在嘗試將Http POST請求發送到本地主機中的web-api2服務器。 我的客戶端運行在http:// localhost:4200上 ,服務器運行在http:// localhost / MemoryGameServer / api / Test上 。 (原產地不同)
我有angular7客戶代碼:
signUp(user: User){
const body : any = {
"FullName": "FullName",
"UserName": "UserName",
"Password": "Password",
"Email": "Email",
"UserId": 2
}
var headerOptions = new HttpHeaders({ 'Content-Type':'application/json' });
return this.http.post(this.rootUrl + 'Test1', JSON.stringify(body), {
headers: headerOptions,
withCredentials: true
});
}
而且我有Web api 2服務器代碼:
public class clsTest
{
public string FullName { get; set; }
public string UserName { get; set; }
public string Password { get; set; }
public string Email { get; set; }
public int UserId { get; set; }
}
[RoutePrefix("api")]
[EnableCors(origins: "http://localhost:4200", headers: "*", methods: "*")]
public class MainController : ApiController
{
[Route("Test1"), HttpPost]
public IHttpActionResult Test1(clsTest data)
{
return Ok("OK!!");
}
}
我的WebApiConfig.cs文件:(已更新 )
public static void Register(HttpConfiguration config)
{
EnableCorsAttribute cors = new EnableCorsAttribute("http://localhost:4200", "*", "*")
{
SupportsCredentials = true
};
config.EnableCors(cors);
config.Routes.MapHttpRoute(
name: "DefaultApi",
routeTemplate: "api/{controller}/{id}",
defaults: new { id = RouteParameter.Optional }
);
}
但我得到了錯誤:
我該如何解決? 我需要將帶有Json對象的http發布請求發送到服務器。
謝謝!
更新:我將此代碼添加到我的web.config文件中:
<httpProtocol>
<customHeaders>
<add name="Access-Control-Allow-Origin" value="http://localhost:4200" />
<add name="Access-Control-Allow-Headers" value="Origin, X-Requested-With, Content-Type, Accept, Access-Control-Allow-Origin" />
<add name="Access-Control-Allow-Methods" value="POST,GET,OPTIONS,PUT,DELETE" />
<add name="Access-Control-Allow-Credentials" value="true" />
</customHeaders>
</httpProtocol>
現在我收到此錯誤:
以下是從Microsoft准則到“啟用CORS”的步驟。
首先,添加CORS NuGet軟件包。
Install-Package Microsoft.AspNet.WebApi.Cors
打開文件App_Start / WebApiConfig.cs。 將以下代碼添加到WebApiConfig.Register方法:
public static void Register(HttpConfiguration config)
{
// New code
config.EnableCors();
config.Routes.MapHttpRoute(
name: "DefaultApi",
routeTemplate: "api/{controller}/{id}",
defaults: new { id = RouteParameter.Optional }
);
}
接下來,將[EnableCors]屬性添加到Controller類:
using System.Net.Http;
using System.Web.Http;
using System.Web.Http.Cors;
namespace WebService.Controllers
{
[EnableCors(origins: "http://localhost:4200", headers: "*", methods: "*")]
public class MainController : ApiController
{
// Controller methods not shown...
}
}
這允許來自WebClient的跨域請求,同時仍然禁止所有其他跨域請求。
原始URL的末尾請勿包含正斜杠。
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