HTTP 拦截器显示多条消息问题

Question

在我的项目中(.net core 2.2 + angular 8(。为了显示一个错误 HttpInterceptor 它工作得很好， 但是对于多条消息，它也在工作，但没有显示正确的错误消息。 我得到了类似的东西：

[object Object] One or more validation errors occurred. 400 0HLRCTBS664E8:00000002

我的拦截器看起来像：

@Injectable()
export class ErrorInterceptor implements HttpInterceptor {
intercept(req: HttpRequest<any>, next: HttpHandler): Observable<HttpEvent<any>> {
return next.handle(req).pipe(
catchError(error => {
if (error instanceof HttpErrorResponse) {
if (error.status === 401) {
return throwError(error.statusText);
}
const applicationError = error.headers.get('Application-Error');
if (applicationError) {
console.error(applicationError);
return throwError(applicationError);
}
const serverError = error.error;
let modalStateErrors = '';
if (serverError && typeof serverError === 'object') {
for (const key in serverError) {
if (serverError[key]) {
modalStateErrors += serverError[key] + 'n';
}
}
}
return throwError(modalStateErrors || serverError || 'Server Error');
}
})
)
}
}
export const ErrorInterceptorProvide = {
provide: HTTP_INTERCEPTORS,
useClass: ErrorInterceptor,
multi: true
}

我使用的dto类：

[Required(ErrorMessage = "username is required")]
public string Username { get; set; }
[Required(ErrorMessage = "password is required")]
[StringLength(20, MinimumLength = 6, ErrorMessage = "Password should be between 6 and 20 
characters")]
public string Password { get; set; }

我的启动类如下所示：

public void Configure(IApplicationBuilder app, IHostingEnvironment env)
{
if (env.IsDevelopment())
{
app.UseDeveloperExceptionPage();
}
else
{
app.UseExceptionHandler(builder =>
{
builder.Run(async context =>
{
context.Response.StatusCode = (int) HttpStatusCode.InternalServerError;
var error = context.Features.Get<IExceptionHandlerFeature>();
if (error != null)
{
context.Response.AddApplicationError(error.Error.Message);
await context.Response.WriteAsync(error.Error.Message);
}
});
});                
}

app.UseCors(x => x.AllowAnyOrigin().AllowAnyMethod().AllowAnyHeader());
app.UseAuthentication();
app.UseMvc();
}
}

应用程序错误扩展方法：

public static class Extensions
{
public static void AddApplicationError(this HttpResponse response, string message)
{
response.Headers.Add("Application-Error", message);
response.Headers.Add("Access-Control-Expose-Headers", "Application-Error");
response.Headers.Add("Access-Control-Allow-Origin", "*");
}
}

Answer 1

似乎您在使用 API 的自动 400 响应时遇到了问题。

避免它的最佳方法是抑制此错误。

要禁用自动 400 行为，请将 SuppressModelStateInvalidFilter 属性为 true。添加以下内容 Startup.ConfigureServices 中突出显示的代码：

这是本文中包含的代码：

services.AddMvc()
.SetCompatibilityVersion(CompatibilityVersion.Version_2_2)
.ConfigureApiBehaviorOptions(options =>
{
options.SuppressConsumesConstraintForFormFileParameters = true;
options.SuppressInferBindingSourcesForParameters = true;
options.SuppressModelStateInvalidFilter = true;
options.SuppressMapClientErrors = true;
options.ClientErrorMapping[404].Link =
"https://httpstatuses.com/404";
});

微软在github中推荐的方式，在这里