How to change 500 error in IIS?

Question

ASP.NET

Now I have such a situation:

I want 2 things:
1) to make it just write a server error, without details.
2) make a request response with the code 200 and with information about the error, briefly and in text form. This is for debugging a third party server. debug=true.

Answer 1

in Web.Config

<customErrors mode="RemoteOnly" defaultRedirect="~/errors/error.aspx">
      <error statusCode="500" redirect="~/errors/error500.aspx"  redirectMode="ResponseRewrite" />/>
    </customErrors>

in the page file
in the backend file of the page

protected void Page_Load(object sender, EventArgs e)
        {
var error = HttpContext.Current.Server.GetLastError();
this.ErrorMessage = error.Message;
        }