我正在为DELETE和POST处理一些问题。
GET工作正常。
设置为:Azure API管理和调用该API的Blazor Webassembly独立客户端(Azure应用程序服务)中的.Net核心API。
尝试删除时出现错误。
“已被CORS策略阻止:对预检请求的响应未通过访问控制检查:不存在“ Access-Control-Allow-Origin”标头”
因此,我很难理解这里需要什么代码。 .NET Core的CORS上到处都有很多示例,而且还有不同的Blazor设置(服务器,托管wasm等)。
我想我需要以某种方式处理预检请求,才能使其正常工作?
这就是我现在所使用的:
调用API的我的ServiceTimes.razor
@code {
private const string ServiceEndpoint = "https://MyProdAPI.azure-api.net/api/ServiceTimes";
private LWS_ServiceTimes[] servicetimes;
LWS_ServiceTimes servicetimeObj = new LWS_ServiceTimes();
string ids = "0";
bool showAddrow = false;
bool loadFailed;
protected override async Task OnInitializedAsync()
{
ids = "0";
try
{
servicetimes = await Http.GetFromJsonAsync<LWS_ServiceTimes[]>(ServiceEndpoint);
}
catch (AccessTokenNotAvailableException exception)
{
exception.Redirect();
}
}
// Delete Method
protected async Task DeleteServiceTimes(long ServiceTimesID)
{
showAddrow = false;
ids = ServiceTimesID.ToString();
await Http.DeleteAsync("https://MyprodAPI.azure-api.net/api/ServiceTimes/1"); //Deletes the ID=1
}
Blazor Webassembly独立客户端Program.cs
public static async Task Main(string[] args)
{
var builder = WebAssemblyHostBuilder.CreateDefault(args);
builder.RootComponents.Add<App>("app");
builder.Services.AddScoped(sp => new HttpClient { BaseAddress = new Uri("https://prodsite.azurewebsites.net") });
builder.Services.AddMsalAuthentication(options =>
{
builder.Configuration.Bind("AzureAd", options.ProviderOptions.Authentication);
options.ProviderOptions.DefaultAccessTokenScopes.Add("api://xxxxxxxx-xxxx-xxxx-xxxx-xxxx/API.Access"); //API.Acess my scope in API
});
builder.Services.AddHttpClient("ServerAPI",
client => client.BaseAddress = new Uri("https://MyprodAPI.azure-api.net"))
.AddHttpMessageHandler<BaseAddressAuthorizationMessageHandler>();
builder.Services.AddScoped(sp => sp.GetRequiredService<IHttpClientFactory>()
.CreateClient("ServerAPI"));
await builder.Build().RunAsync();
}
API启动
public void ConfigureServices(IServiceCollection services)
{
services.AddDbContext<LwsSpiderContext>(options => options.UseSqlServer(Configuration.GetConnectionString("MyDatabase")));
services.AddSwaggerGen();
services.AddCors(options =>
{
options.AddPolicy(name: MyAllowSpecificOrigins,
builder =>
{
builder.WithOrigins("https://prodsite.azurewebsites.net");
builder.AllowAnyMethod();
builder.WithHeaders(HeaderNames.ContentType, HeaderNames.Authorization, "x-custom-header");
builder.AllowCredentials();
});
});
services.AddControllers();
}
public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
{
if (env.IsDevelopment())
{
app.UseDeveloperExceptionPage();
}
app.UseSwagger();
// app.UseHttpsRedirection();
app.UseRouting();
app.UseCors("MyAllowSpecificOrigins");
app.UseAuthentication();
app.UseAuthorization();
app.UseEndpoints(endpoints =>
{
endpoints.MapControllers();
});
}