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Display custom page when error happens in Koa


Display custom page when error happens in Koa

By : Joshua Abel
Date : November 22 2020, 02:42 PM
This might help you If you are using Koa2, you don't have to return inside middleware, instead, use await. And by the way, your middleware function MUST be an async function.
Here is an example of a combined 404 and 500 middleware:
code :
  app.use(async (ctx, next) => {
    try {
      await next()

      if (ctx.status === 404) ctx.throw(404)
    } catch (err) {
      console.error(err)
      ctx.status = err.status || 500
      ctx.body = errorPage.render({ // Use your render method
        error: err,
      })
    }
  })

  // Your normal routes here


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Custom error pages are not working IIS 7.0- It's display the default error page

Custom error pages are not working IIS 7.0- It's display the default error page


By : DeleteThisAccount
Date : March 29 2020, 07:55 AM
hope this fix your issue You might have to use the element under which is meant for IIS 7 etc.
Strange that it's different from the development version of IIS. Perhaps if you use IIS Express for development it should match the IIS 7 behaviour more closely.
Display specific error message on custom error page

Display specific error message on custom error page


By : user3483396
Date : March 29 2020, 07:55 AM
will be helpful for those in need You should be using logging to know when/where/what errors occured. The POINT of the custom error page is to not allow the end user to see why it messed up because obviously that could be a security risk. Look into using ELMAH. It automatically creates a nice web gui for any uncaught exceptions. And you can also create logs when you catch the errors yourself. If you do chose to use ELMAH, I would also strongly recommend installing it with the NuGet package manager
Should Redirect to a common display/page on Custom Route/Page Not Found error in Rails

Should Redirect to a common display/page on Custom Route/Page Not Found error in Rails


By : George Thomas
Date : March 29 2020, 07:55 AM
hop of those help? When someone enters unsupported url Rails will raise ActionController::RoutingError. You can rescue this error and render 404 Not Found html.
Rails provides some special function called rescue_from for this purpose.
code :
class ApplicationController < ActionController::Base
   rescue_from ActionController::RoutingError, :with => :render_not_found
   rescue_from StandardError, :with => :render_server_error

   protected
     def render_not_found
        render "shared/404", :status => 404
     end

     def render_server_error
        render "shared/500", :status => 500
     end
end
Math.sqrt(-5) -> Force custom exception & reroute and display error on custom error page

Math.sqrt(-5) -> Force custom exception & reroute and display error on custom error page


By : user3822112
Date : March 29 2020, 07:55 AM
this one helps. You've one big problem here: if you throw an Exception halfway a JSP file, then the chance is big that it will never reach the error.jsp, simply because the response is already committed. The response headers are already set, the response writer is already obtained, the response content is already sent to the client (even if only partly), all only because of the fact that the JSP does that by nature as being a pure view technology. This is a point of no return. The enduser may end up with a blank page and you may end up with an IllegalStateException in the server logs.
If you are very, very lucky, everything is still in the buffer which is not flushed yet, then the webcontainer can still manage to reset it all and forward the request to error.jsp. But I wouldn't rely on that. Writing raw Java code in JSP files is considered bad practice.
Handle all exceptions and display custom error page instead of default framework error page

Handle all exceptions and display custom error page instead of default framework error page


By : PrmoD KumR
Date : March 29 2020, 07:55 AM
Hope this helps You can define your own error page by creating new sub-package named errors on views package. In this sub-package, you can create template file for your customized error page using the error code name such as:
404.html for Not Found Error page 403.html for Forbidden Error page 500.html for Internal Server Error page etc...
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