我正在嘗試在 Startup.cs 中啟用 CORS，但沒有成功。我在端口 4200 上有一個 Angular 應用程序，試圖與我的 c# Web 應用程序通信。我在 Angular 中不斷收到此錯誤無法加載http://localhost:52008/Account/GetJWT：預檢響應沒有 HTTP ok 狀態(tài)。我的研究似乎表明 CORS 未正確啟用。知道我錯過了什么嗎？public void ConfigureServices(IServiceCollection services){..... services.AddCors(options => { options.AddPolicy("EnableCORS", builder => { builder.AllowAnyOrigin() .AllowAnyMethod() .AllowAnyHeader() .AllowCredentials() .Build(); }); }); .........}public void Configure(IApplicationBuilder app, IHostingEnvironment env){....... app.UseCors("EnableCORS"); ........ }這是 Angular POST 請求： login(form: NgForm) { let credentials = JSON.stringify(form.value); console.log(credentials); this.http.post("http://localhost:52008/Account/GetJWT", credentials, { headers: new HttpHeaders({ "Content-Type": "application/json" }) }) }POSTMAN 查詢的結果
3 回答
偶然的你
TA貢獻1841條經驗 獲得超3個贊
使用以下代碼啟用 CORS。.NET Core 版本：2.1 和 Angular 版本：1.6.7
public class Startup
{
public Startup(IConfiguration configuration)
{
Configuration = configuration;
}
public IConfiguration Configuration { get; }
// This method gets called by the runtime. Use this method to add services to the container.
public void ConfigureServices(IServiceCollection services)
{
services.AddMvc()
.AddJsonOptions(options =>
{
options.SerializerSettings.ReferenceLoopHandling = ReferenceLoopHandling.Ignore;
options.SerializerSettings.PreserveReferencesHandling = PreserveReferencesHandling.None;
});
services.AddCors();
}
// This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
public void Configure(IApplicationBuilder app, IHostingEnvironment env, IServiceProvider serviceProvider)
{
app.UseCors(options =>
{
options.AllowAnyMethod();
options.AllowAnyOrigin();
options.AllowAnyHeader();
});
app.UseMvc();
}
}
角代碼：
$http.post("http://localhost:52008/Account/GetJWT", credentials,{
headers: new HttpHeaders({
"Content-Type": "application/json"
})).then(
function(response) {
console.log(response);
},
function() {
console.log("unable to login");
});
如果問題仍然存在，請告訴我。
SMILET
TA貢獻1796條經驗 獲得超4個贊
您可以在 startup.cs 中配置核心，如下所示，并將源添加到 ConfigurationServices，如下所示。
public void ConfigureServices(IServiceCollection services)
{
services.AddCors(options =>
{
options.AddPolicy("AllowSpecificOrigin",
builder => builder.WithOrigins("http://example.com"));
});
}
public void Configure(IApplicationBuilder app, IHostingEnvironment env,
ILoggerFactory loggerFactory)
{
loggerFactory.AddConsole();
if (env.IsDevelopment())
{
app.UseDeveloperExceptionPage();
}
// Shows UseCors with named policy.
app.UseCors("AllowSpecificOrigin");
app.Run(async (context) =>
{
await context.Response.WriteAsync("Hello World!");
});
}
將 CORS 策略添加到特定操作。
[HttpGet]
[EnableCors("AllowSpecificOrigin")]
public IEnumerable<string> Get()
{
return new string[] { "value1", "value2" };
}
慕娘9325324
TA貢獻1783條經驗 獲得超4個贊
public void ConfigureServices(IServiceCollection services)
{
//add cors service
services.AddCors(options => options.AddPolicy("Cors",
builder => {
builder.AllowAnyOrigin()
.AllowAnyMethod()
.AllowAnyHeader();
} ));
services.AddMvc(); //
//--------------------------------------
// This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
public void Configure(IApplicationBuilder app, IHostingEnvironment env)
{
if (env.IsDevelopment())
{
app.UseDeveloperExceptionPage();
}
app.UseCors("Cors");//------>let app use new service
app.UseMvc();
}
在您的控制器內部，確保您從身體上抓取物體
//發(fā)布請求
[HttpPost]
public Message Post([FromBody] Message message)
{
var msg = new Message { Owner = message.Owner, Text = message.Text };
db.Messages.AddAsync(msg);
db.SaveChangesAsync();
return message;
}
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