public static void UsePageNotFound(this IApplicationBuilder application, string notFoundUrl = "/Error/PageNotFound")
{
application.UseStatusCodePages(async context =>
{
if (context.HttpContext.Response.StatusCode != 404 ||
(HttpRequestExtensions.IsAjaxRequest(context.HttpContext.Request)
? 1
: (HttpRequestExtensions.IsApiRequest(context.HttpContext.Request) ? 1 : 0)) != 0 ||
context.HttpContext.Request.IsStaticContentRequest())
{
return;
}
var originalPath = context.HttpContext.Request.Path;
var originalQueryString = context.HttpContext.Request.QueryString;
context.HttpContext.Features.Set((IStatusCodeReExecuteFeature) new StatusCodeReExecuteFeature()
{
OriginalPathBase = context.HttpContext.Request.PathBase.Value,
OriginalPath = originalPath.Value,
OriginalQueryString = (originalQueryString.HasValue ? originalQueryString.Value : (string)null)
});
context.HttpContext.Request.Path = (PathString)notFoundUrl;
context.HttpContext.Request.QueryString = QueryString.Empty;
try
{
await context.Next(context.HttpContext).ConfigureAwait(false);
}
finally
{
context.HttpContext.Request.QueryString = originalQueryString;
context.HttpContext.Request.Path = originalPath;
context.HttpContext.Features.Set((IStatusCodeReExecuteFeature)null);
}
});
}
public static bool IsApiRequest(HttpRequest request)
{
if (request == null)
{
throw new ArgumentNullException(nameof(request));
}
return(HttpRequestExtensions.IsApiRequest(request.Path));
}