asp.net-core - 返回404页面，无需重定向

Question

我试图使我的404正常工作，但无法弄清楚如何正确使用它。

最初，我在Statup Configure方法中设置以下内容:

app.UseMvc(routes =>
{
    // routing here
});

app.Use((context, next) =>
{
    context.Response.StatusCode = 404;
    return next();
});

app.UseStatusCodePagesWithRedirects("/error/{0}");

哪个重定向到我显示错误的页面。但是，状态码为 302 > 200。我将 /error/{code} Action 设置为返回相关的状态码，所以现在我有了 302 > 404(由于302重定向)，使其看上去好像 /error/404页面不存在(确实存在)。

我想做的是返回没有重定向的错误页面，以便尝试请求 /doesntexist将返回404并显示错误页面。

我尝试的另一件事是使用 app.UseStatusCodePagesWithReExecute("/error/{0}");，它确实返回404而不更改url，但仅显示空白页而不是我的错误页

Answer 1

在我的应用中，我这样做是这样的:

// custom 404 and error page - this preserves the status code (ie 404)
app.UseStatusCodePagesWithReExecute("/Home/Error/{0}");

我的HomeController具有此操作方法

public IActionResult Error(int statusCode)
{
    if (statusCode == 404)
    {
        var statusFeature = HttpContext.Features.Get<IStatusCodeReExecuteFeature>();
        if (statusFeature != null)
        {
            log.LogWarning("handled 404 for url: {OriginalPath}", statusFeature.OriginalPath);
        }

    }
    return View(statusCode);
}

我的看法是这样的:

@model int

@{
    switch (Model)
    {
        case 400:
            ViewData["Icon"] = "fa fa-ban text-danger";
            ViewData["Title"] = "Bad Request";
            ViewData["Description"] = "Your browser sent a request that this server could not understand.";
            break;
        case 401:
            ViewData["Icon"] = "fa fa-ban text-danger";
            ViewData["Title"] = "Unauthorized";
            ViewData["Description"] = "Sorry, but the page requires authentication.";
        break;
        case 403:
            ViewData["Icon"] = "fa fa-exclamation-circle text-danger";
            ViewData["Title"] = "Forbidden";
            ViewData["Description"] = "Sorry, but you don't have permission to access this page.";
        break;
        case 404:
            ViewData["Icon"] = "fa fa-exclamation-circle text-danger";
            ViewData["Title"] = "Page Not Found";
            ViewData["Description"] = "Sorry, but the page you were looking for can't be found.";
            break;
        case 500:
        default:
            ViewData["Icon"] = "fa fa-exclamation-circle text-danger";
            ViewData["Title"] = "Unexpected Error";
            ViewData["Description"] = "Well, this is embarrassing. An error occurred while processing your request. Rest assured, this problem has been logged and hamsters have been released to fix the problem.";
            break;
    }
}

<div class="jumbotron text-center">
    <header>
        <h1><span aria-hidden="true" class="@ViewData["Icon"]"></span> @ViewData["Title"]</h1>
    </header>
    <p>@ViewData["Description"]</p>
    <a class="btn btn-primary btn-lg" href="@Url.RouteUrl("/")"><span aria-hidden="true" class="fa fa-home"></span> Site Home</a>
</div>

正如@khellang所提到的，中间件的顺序很重要，这应该在app.UseMvc之前。