I want to capture 500 errors in my classic ASP application and receive an email of the error.
The biggest problem I had was getting a page to execute at all when an asp page crashed. Either IIS let it through for ASP to handle the error (which is useless because customErrors tag is completely ignored) or it would take over and blank out Server.GetLastError.
In the end I figured out that if you set the defaultPath directly to httpErrors and have the defaultResponseMode to ExecuteURL it will not only execute the actual 500.asp page but it will let the page be so that Server.GetLastError can remain populated.
web.config
<?xml version="1.0" encoding="UTF-8"?>
<configuration>
<system.webServer>
<httpErrors defaultPath="/500.asp" defaultResponseMode="ExecuteURL" />
</system.webServer>
</configuration>
500.asp
<%option explicit%>
<!DOCTYPE html>
<%
'Get Error
Dim objASPError
Set objASPError = Server.GetLastError
'Reset Response
If Response.Buffer Then
Response.Clear
Response.Status = "500 Internal Server Error"
Response.ContentType = "text/html"
Response.Expires = 0
End If
'CSS
dim style : style = "<style type='text/css'>"
style = style & "table { width: 800px; } "
style = style & "#debugInfo th{ text-align:left; background-color:palegoldenrod; }"
style = style & "#debugInfo td{ background-color:lightgoldenrodyellow; }"
style = style & "#sessionInfo th{ text-align:left; background-color:cyan;}"
style = style & "#sessionInfo td{ background-color:lightcyan; }"
style = style & "#appInfo th{ text-align:left; background-color:tomato; }"
style = style & "#appInfo td{ background-color:pink; }"
style = style & "</style>"
' Error Message
Dim errMsg : errMsg = ""
errMsg = errMsg &"<p>"
errMsg = errMsg & objASPError.Category & "(0x" & hex(objASPError.Number) & ")<br />"
errMsg = errMsg & objASPError.Description & "<br />"
errMsg = errMsg & objASPError.File & ", line " & objASPError.Line & "<br />"
errMsg = errMsg & objASPError.Source & "<br />"
errMsg = errMsg & "</p>"
'Debug Info
Dim debugInfo : debugInfo = ""
debugInfo = debugInfo & "<table id='debugInfo'>"
debugInfo = debugInfo & "<tr> <th colspan='2' style='text-align:center;background-color:gold;padding:2px;'>Debug Information</th> </tr>"
debugInfo = debugInfo & "<tr> <th>User</th> <td>"& Request.ServerVariables("AUTH_USER") &"</td> </tr>"
debugInfo = debugInfo & "<tr> <th>Time</th> <td>"& Now() &"</td> </tr>"
debugInfo = debugInfo & "<tr> <th>Page</th> <td>"& Request.ServerVariables("SCRIPT_NAME") &"</td> </tr>"
debugInfo = debugInfo & "<tr> <th>User IP</th> <td>"& Request.ServerVariables("REMOTE_HOST") & " (" & Request.ServerVariables("REMOTE_ADDR") &")</td> </tr>"
debugInfo = debugInfo & "<tr> <th>Browser</th> <td>"& Request.ServerVariables("HTTP_USER_AGENT") &"</td> </tr>"
debugInfo = debugInfo & "<tr> <th>Server</th> <td>"& Request.ServerVariables("SERVER_NAME") & " (" & Request.ServerVariables("LOCAL_ADDR") &")</td> </tr>"
debugInfo = debugInfo & "<tr> <th>POST</th> <td>"& Request.Form &"</td> </tr>"
debugInfo = debugInfo & "</table>"
'Session Variables
Dim sessionVar, sessionVarItem, sessionTable
sessionTable = "<table id='sessionInfo'>"
sessionTable = sessionTable & "<tr><th colspan='2' style='text-align:center;background-color:dodgerblue;padding:2px;'>Session Variables ("& Session.Contents.Count &")</th></tr>"
For Each sessionVar in Session.Contents
If IsArray(Session(sessionVar)) Then
For appVarItem = LBound(Session(sessionVar)) to UBound(Session(sessionVar))
sessionTable = sessionTable & "<tr>"
sessionTable = sessionTable & "<th>" & sessionVar & " " & sessionVarItem & "</th>"
sessionTable = sessionTable & "<td>" & Session(sessionVar)(sessionVarItem) & "</td>"
sessionTable = sessionTable & "</tr>"
Next
Else
sessionTable = sessionTable & "<tr>"
sessionTable = sessionTable & "<th>" & sessionVar & "</th>"
sessionTable = sessionTable & "<td>" & Session(sessionVar) & "</td>"
sessionTable = sessionTable & "</tr>"
End If
Next
sessionTable = sessionTable & "</table>"
'Application Variables
Dim appVar, appVarItem, appVarTable
appVarTable = "<table id='appInfo'>"
appVarTable = appVarTable & "<tr><th colspan='2' style='text-align:center;background-color:lightcoral;padding:2px;'>Application Variables ("& Application.Contents.Count &")</th></tr>"
For Each appVar in Application.Contents
If IsArray(Application(appVar)) Then
For appVarItem = LBound(Application(appVar)) to UBound(Application(appVar))
appVarTable = appVarTable & "<tr>"
appVarTable = appVarTable & "<th>" & appVar & " " & appVarItem & "</th>"
appVarTable = appVarTable & "<td>" & Application(item)(appVarItem) & "</td>"
appVarTable = appVarTable & "</tr>"
Next
Else
appVarTable = appVarTable & "<tr>"
appVarTable = appVarTable & "<th>" & appVar & "</th>"
appVarTable = appVarTable & "<td>" & Application(appVar) & "</td>"
appVarTable = appVarTable & "</tr>"
End If
Next
appVarTable = appVarTable & "</table>"
'Send Email
dim tech : tech = CreateObject("WScript.Network").UserName = "ITGuy"
If NOT tech Then
Dim oMessage : Set oMessage = CreateObject("CDO.Message")
oMessage.Configuration.Fields.Item ("http://schemas.microsoft.com/cdo/configuration/sendusing") = 2
oMessage.Configuration.Fields.Item ("http://schemas.microsoft.com/cdo/configuration/smtpserver") = "smtp.server.com"
oMessage.Configuration.Fields.Item ("http://schemas.microsoft.com/cdo/configuration/smtpserverport") = 25
oMessage.Configuration.Fields.Update
oMessage.To = "ITGuy@server.com"
oMessage.From = "WebApp@server.com"
oMessage.Subject="WebApp Error - " & objASPError.Category
oMessage.htmlBody = style & errMsg & debugInfo & sessionTable & appVarTable
oMessage.Send
End If
%>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>System Error</title>
<% If tech Then Response.Write style%>
</head>
<body>
Sorry! The system encountered an error. An email has been sent to IT. If you have any concerns or questions please send an email to <a href="mailto:ITGuy@server.com">ITGuy@server.com</a> or call x555.
<%If tech Then Response.Write errMsg & debugInfo & sessionTable & appVarTable %>
</body>
</html>