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    User1866599147 posted

    I'm writing a simple filter which does some modification to the response sent by IIS.

    1) When I get a SF_NOTIFY_SEND_RAW_DATA, I store/append the raw data into a buffer and set cbInData of the HTTP_FILTER_RAW_DATA structure to 0 to stop IIS sending back the response.
    2) When I get a SF_NOTIFY_END_OF_REQUEST, I process the buffer, and call WriteClient passing the modified data.

    The problem is that when I open a page where i should get an error (eg. goto an invalid page - 404, deny a particular IP - 403), the buffer contains:
       HTTP/1.1 404 Not Found
       Content-Length: 0
       Server: Microsoft-IIS/7.5
       X-Powered-By: ASP.NET
    and i get a blank page on the browser.

    However when i comment my code, I still see the above response(with content-length=0) in step 1, but the output in the browser has a proper error message. I guess this is the custom error module sending the proper response. But why is it not sending the proper error message when my filter sends the same response in step 2 with WriteClient ?

     Note: This works absolutely fine in IIS 6. Had it been IIS 6, I would have got a proper response with the error text corresponding to 404 in step 2.

    Thursday, April 29, 2010 9:24 AM

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    User45572240 posted
    Did you ever find a resolution to this? I'm running into the exact same problem.
    Wednesday, August 3, 2011 2:09 PM
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    User-248641251 posted
    Try:<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /><o:p></o:p><configuration><o:p></o:p>  <system.webServer><o:p></o:p>    <httpErrors existingResponse="PassThrough" /><o:p></o:p><o:p> </o:p><o:p></o:p> <o:p></o:p> <o:p></o:p>http://www.iis.net/ConfigReference/system.webServer/httpErrors<o:p></o:p>

     

    Wednesday, August 3, 2011 2:42 PM
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    User-248641251 posted
    Ouch... I cannot format message at all... L<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /><o:p></o:p>
    Wednesday, August 3, 2011 2:43 PM
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    User45572240 posted

    Tried that, still didn't work :-( The following is the failed request log for the request.

    Where I am seeing a problem is that the CustomErrorModule never seems to load... but I can't figure out why...

    Hope this helps! Thanks!


    1. GENERAL_REQUEST_START SiteId="39", AppPoolId="test 4.0", ConnId="1610612738", RawConnId="0", RequestURL="http://test.andy.me:80/taxes", RequestVerb="GET" 19:02:16.701
    2. — PRE_BEGIN_REQUEST_START ModuleName="FailedRequestsTracingModule" 19:02:16.701
    3. — PRE_BEGIN_REQUEST_END ModuleName="FailedRequestsTracingModule", NotificationStatus="NOTIFICATION_CONTINUE" 19:02:16.701
    4. — PRE_BEGIN_REQUEST_START ModuleName="RequestMonitorModule" 19:02:16.701
    5. — PRE_BEGIN_REQUEST_END ModuleName="RequestMonitorModule", NotificationStatus="NOTIFICATION_CONTINUE" 19:02:16.701
    6. — PRE_BEGIN_REQUEST_START ModuleName="IsapiFilterModule" 19:02:16.701
    7.  FILTER_PREPROC_HEADERS_START  19:02:16.701
    8.  FILTER_START FilterName="C:\Windows\Microsoft.NET\Framework64\v4.0.30319\aspnet_filter.dll" 19:02:16.701
    9. — GENERAL_SET_REQUEST_HEADER HeaderName="AspFilterSessionId", HeaderValue="", Replace="true" 19:02:16.701
    10. FILTER_SET_REQ_HEADER HeaderName="AspFilterSessionId:", HeaderValue="" 19:02:16.701
    11. FILTER_END NotificationStatus="SF_STATUS_REQ_NEXT_NOTIFICATION" 19:02:16.701
    12. FILTER_PREPROC_HEADERS_END  19:02:16.701
    13.  PRE_BEGIN_REQUEST_END ModuleName="IsapiFilterModule", NotificationStatus="NOTIFICATION_CONTINUE" 19:02:16.701
    14.  PRE_BEGIN_REQUEST_START ModuleName="WebDAVModule" 19:02:16.701
    15. — PRE_BEGIN_REQUEST_END ModuleName="WebDAVModule", NotificationStatus="NOTIFICATION_CONTINUE" 19:02:16.701
    16. GENERAL_ENDPOINT_INFORMATION RemoteAddress="192.168.1.162", RemotePort="53255", LocalAddress="192.168.1.162", LocalPort="80" 19:02:16.701
    17. GENERAL_REQUEST_HEADERS Headers="Cache-Control: max-age=0
    Connection: keep-alive
    Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
    Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.3
    Accept-Encoding: gzip,deflate,sdch
    Accept-Language: en-US,en;q=0.8
    Cookie: ASP.NET_SessionId=5lqmwiaztmg4daw2jlafmygs; __utma=47305917.420453292.1307034384.1312378655.1312391404.26; __utmc=47305917; __utmz=47305917.1307034384.1.1.utmcsr=(direct)|utmccn=(direct)|utmcmd=(none)
    Host: test.andy.me
    User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/534.30 (KHTML, like Gecko) Chrome/12.0.742.122 Safari/534.30
    " 19:02:16.701
    18. URL_CACHE_ACCESS_START RequestURL="/taxes" 19:02:16.701
    19. URL_CACHE_ACCESS_END PhysicalPath="", URLInfoFromCache="false", URLInfoAddedToCache="true", ErrorCode="The operation completed successfully.
     (0x0)" 19:02:16.701
    20. GENERAL_GET_URL_METADATA PhysicalPath="", AccessPerms="513" 19:02:16.701
    21. HANDLER_CHANGED OldHandlerName="", NewHandlerName="StaticFile", NewHandlerModules="StaticFileModule,DefaultDocumentModule,DirectoryListingModule", NewHandlerScriptProcessor="", NewHandlerType="" 19:02:16.701
    22. — NOTIFY_MODULE_START ModuleName="IsapiFilterModule", Notification="MAP_PATH", fIsPostNotification="false" 19:02:16.701
    23. — NOTIFY_MODULE_END ModuleName="IsapiFilterModule", Notification="MAP_PATH", fIsPostNotificationEvent="false", NotificationStatus="NOTIFICATION_CONTINUE" 19:02:16.701
    24. — NOTIFY_MODULE_START ModuleName="HttpCacheModule", Notification="BEGIN_REQUEST", fIsPostNotification="false" 19:02:16.701
    25. — NOTIFY_MODULE_END ModuleName="HttpCacheModule", Notification="BEGIN_REQUEST", fIsPostNotificationEvent="false", NotificationStatus="NOTIFICATION_CONTINUE" 19:02:16.701
    26. — NOTIFY_MODULE_START ModuleName="IpRestrictionModule", Notification="BEGIN_REQUEST", fIsPostNotification="false" 19:02:16.701
    27. — NOTIFY_MODULE_END ModuleName="IpRestrictionModule", Notification="BEGIN_REQUEST", fIsPostNotificationEvent="false", NotificationStatus="NOTIFICATION_CONTINUE" 19:02:16.701
    28. — NOTIFY_MODULE_START ModuleName="RequestFilteringModule", Notification="BEGIN_REQUEST", fIsPostNotification="false" 19:02:16.701
    29. — NOTIFY_MODULE_END ModuleName="RequestFilteringModule", Notification="BEGIN_REQUEST", fIsPostNotificationEvent="false", NotificationStatus="NOTIFICATION_CONTINUE" 19:02:16.701
    30. — NOTIFY_MODULE_START ModuleName="FailedRequestsTracingModule", Notification="BEGIN_REQUEST", fIsPostNotification="false" 19:02:16.701
    31. — NOTIFY_MODULE_END ModuleName="FailedRequestsTracingModule", Notification="BEGIN_REQUEST", fIsPostNotificationEvent="false", NotificationStatus="NOTIFICATION_CONTINUE" 19:02:16.701
    32. — NOTIFY_MODULE_START ModuleName="ConfigurationValidationModule", Notification="BEGIN_REQUEST", fIsPostNotification="false" 19:02:16.701
    33. — NOTIFY_MODULE_END ModuleName="ConfigurationValidationModule", Notification="BEGIN_REQUEST", fIsPostNotificationEvent="false", NotificationStatus="NOTIFICATION_CONTINUE" 19:02:16.701
    34. — NOTIFY_MODULE_START ModuleName="IsapiFilterModule", Notification="AUTHENTICATE_REQUEST", fIsPostNotification="false" 19:02:16.701
    35. — NOTIFY_MODULE_END ModuleName="IsapiFilterModule", Notification="AUTHENTICATE_REQUEST", fIsPostNotificationEvent="false", NotificationStatus="NOTIFICATION_CONTINUE" 19:02:16.701
    36. — NOTIFY_MODULE_START ModuleName="CertificateMappingAuthenticationModule", Notification="AUTHENTICATE_REQUEST", fIsPostNotification="false" 19:02:16.701
    37. AUTH_START AuthTypeSupported="MapCliCert" 19:02:16.701
    38. AUTH_END  19:02:16.701
    39. — NOTIFY_MODULE_END ModuleName="CertificateMappingAuthenticationModule", Notification="AUTHENTICATE_REQUEST", fIsPostNotificationEvent="false", NotificationStatus="NOTIFICATION_CONTINUE" 19:02:16.701
    40. — NOTIFY_MODULE_START ModuleName="BasicAuthenticationModule", Notification="AUTHENTICATE_REQUEST", fIsPostNotification="false" 19:02:16.701
    41. AUTH_START AuthTypeSupported="Basic" 19:02:16.701
    42. AUTH_END  19:02:16.701
    43. — NOTIFY_MODULE_END ModuleName="BasicAuthenticationModule", Notification="AUTHENTICATE_REQUEST", fIsPostNotificationEvent="false", NotificationStatus="NOTIFICATION_CONTINUE" 19:02:16.701
    44. — NOTIFY_MODULE_START ModuleName="WindowsAuthenticationModule", Notification="AUTHENTICATE_REQUEST", fIsPostNotification="false" 19:02:16.701
    45. AUTH_START AuthTypeSupported="NT" 19:02:16.701
    46. AUTH_END  19:02:16.701
    47. — NOTIFY_MODULE_END ModuleName="WindowsAuthenticationModule", Notification="AUTHENTICATE_REQUEST", fIsPostNotificationEvent="false", NotificationStatus="NOTIFICATION_CONTINUE" 19:02:16.701
    48. — NOTIFY_MODULE_START ModuleName="DigestAuthenticationModule", Notification="AUTHENTICATE_REQUEST", fIsPostNotification="false" 19:02:16.701
    49. AUTH_START AuthTypeSupported="Digest" 19:02:16.701
    50. AUTH_END  19:02:16.701
    51. — NOTIFY_MODULE_END ModuleName="DigestAuthenticationModule", Notification="AUTHENTICATE_REQUEST", fIsPostNotificationEvent="false", NotificationStatus="NOTIFICATION_CONTINUE" 19:02:16.701
    52. — NOTIFY_MODULE_START ModuleName="IISCertificateMappingAuthenticationModule", Notification="AUTHENTICATE_REQUEST", fIsPostNotification="false" 19:02:16.701
    53. AUTH_START AuthTypeSupported="MapCliCert" 19:02:16.701
    54. AUTH_END  19:02:16.701
    55. — NOTIFY_MODULE_END ModuleName="IISCertificateMappingAuthenticationModule", Notification="AUTHENTICATE_REQUEST", fIsPostNotificationEvent="false", NotificationStatus="NOTIFICATION_CONTINUE" 19:02:16.701
    56. — NOTIFY_MODULE_START ModuleName="AnonymousAuthenticationModule", Notification="AUTHENTICATE_REQUEST", fIsPostNotification="false" 19:02:16.701
    57. AUTH_START AuthTypeSupported="Anonymous" 19:02:16.701
    58. AUTH_REQUEST_AUTH_TYPE RequestAuthType="Anonymous" 19:02:16.701
    59. AUTH_SUCCEEDED AuthType="NT", NTLMUsed="false", RemoteUserName="", AuthUserName="", TokenImpersonationLevel="ImpersonationImpersonate" 19:02:16.701
    60. USER_SET AuthType="", UserName="", SupportsIsInRole="true" 19:02:16.701
    61. AUTH_END  19:02:16.701
    62. — NOTIFY_MODULE_END ModuleName="AnonymousAuthenticationModule", Notification="AUTHENTICATE_REQUEST", fIsPostNotificationEvent="false", NotificationStatus="NOTIFICATION_CONTINUE" 19:02:16.701
    63. — NOTIFY_MODULE_START ModuleName="IsapiFilterModule", Notification="AUTHENTICATE_REQUEST", fIsPostNotification="true" 19:02:16.701
    64. FILTER_AUTH_COMPLETE_START  19:02:16.701
    65. FILTER_AUTH_COMPLETE_END  19:02:16.701
    66. — NOTIFY_MODULE_END ModuleName="IsapiFilterModule", Notification="AUTHENTICATE_REQUEST", fIsPostNotificationEvent="true", NotificationStatus="NOTIFICATION_CONTINUE" 19:02:16.701
    67. FILE_CACHE_ACCESS_START FileName="C:\inetpub\wwwroot\KendallCountyTX\www\taxes", UserName="IUSR", DomainName="NT AUTHORITY" 19:02:16.701
    68. FILE_CACHE_ACCESS_END Successful="false", FileFromCache="false", FileAddedToCache="false", FileDirmoned="true", LastModCheckErrorIgnored="true", ErrorCode="The system cannot find the file specified.
     (0x80070002)", LastModifiedTime="" 19:02:16.701
    69. — NOTIFY_MODULE_START ModuleName="UrlAuthorizationModule", Notification="AUTHORIZE_REQUEST", fIsPostNotification="false" 19:02:16.701
    70. — NOTIFY_MODULE_END ModuleName="UrlAuthorizationModule", Notification="AUTHORIZE_REQUEST", fIsPostNotificationEvent="false", NotificationStatus="NOTIFICATION_CONTINUE" 19:02:16.701
    71. — NOTIFY_MODULE_START ModuleName="HttpCacheModule", Notification="RESOLVE_REQUEST_CACHE", fIsPostNotification="false" 19:02:16.701
    72. OUTPUT_CACHE_LOOKUP_START  19:02:16.701
    73. OUTPUT_CACHE_LOOKUP_END Result="NOT_FOUND" 19:02:16.701
    74. — NOTIFY_MODULE_END ModuleName="HttpCacheModule", Notification="RESOLVE_REQUEST_CACHE", fIsPostNotificationEvent="false", NotificationStatus="NOTIFICATION_CONTINUE" 19:02:16.701
    75. — NOTIFY_MODULE_START ModuleName="StaticCompressionModule", Notification="MAP_REQUEST_HANDLER", fIsPostNotification="false" 19:02:16.701
    76. — NOTIFY_MODULE_END ModuleName="StaticCompressionModule", Notification="MAP_REQUEST_HANDLER", fIsPostNotificationEvent="false", NotificationStatus="NOTIFICATION_CONTINUE" 19:02:16.701
    77. — NOTIFY_MODULE_START ModuleName="HttpRedirectionModule", Notification="MAP_REQUEST_HANDLER", fIsPostNotification="false" 19:02:16.701
    78. — NOTIFY_MODULE_END ModuleName="HttpRedirectionModule", Notification="MAP_REQUEST_HANDLER", fIsPostNotificationEvent="false", NotificationStatus="NOTIFICATION_CONTINUE" 19:02:16.701
    79. — NOTIFY_MODULE_START ModuleName="WebDAVModule", Notification="MAP_REQUEST_HANDLER", fIsPostNotification="false" 19:02:16.701
    80. — NOTIFY_MODULE_END ModuleName="WebDAVModule", Notification="MAP_REQUEST_HANDLER", fIsPostNotificationEvent="false", NotificationStatus="NOTIFICATION_CONTINUE" 19:02:16.701
    81. r MODULE_SET_RESPONSE_ERROR_STATUS
    Warning ModuleName="IIS Web Core", Notification="MAP_REQUEST_HANDLER", HttpStatus="404", HttpReason="Not Found", HttpSubStatus="0", ErrorCode="The system cannot find the file specified.
     (0x80070002)", ConfigExceptionInfo="" 19:02:16.701
    82. — NOTIFY_MODULE_START ModuleName="CustomLoggingModule", Notification="LOG_REQUEST", fIsPostNotification="false" 19:02:16.701
    83. — NOTIFY_MODULE_END ModuleName="CustomLoggingModule", Notification="LOG_REQUEST", fIsPostNotificationEvent="false", NotificationStatus="NOTIFICATION_CONTINUE" 19:02:16.701
    84. — NOTIFY_MODULE_START ModuleName="WebDAVModule", Notification="SEND_RESPONSE", fIsPostNotification="false" 19:02:16.701
    85. — NOTIFY_MODULE_END ModuleName="WebDAVModule", Notification="SEND_RESPONSE", fIsPostNotificationEvent="false", NotificationStatus="NOTIFICATION_CONTINUE" 19:02:16.701
    86. — NOTIFY_MODULE_START ModuleName="HttpLoggingModule", Notification="SEND_RESPONSE", fIsPostNotification="false" 19:02:16.701
    87. — NOTIFY_MODULE_END ModuleName="HttpLoggingModule", Notification="SEND_RESPONSE", fIsPostNotificationEvent="false", NotificationStatus="NOTIFICATION_CONTINUE" 19:02:16.701
    88. — NOTIFY_MODULE_START ModuleName="IsapiModule", Notification="SEND_RESPONSE", fIsPostNotification="false" 19:02:16.701
    89. — NOTIFY_MODULE_END ModuleName="IsapiModule", Notification="SEND_RESPONSE", fIsPostNotificationEvent="false", NotificationStatus="NOTIFICATION_CONTINUE" 19:02:16.701
    90. — NOTIFY_MODULE_START ModuleName="DigestAuthenticationModule", Notification="SEND_RESPONSE", fIsPostNotification="false" 19:02:16.701
    91. — NOTIFY_MODULE_END ModuleName="DigestAuthenticationModule", Notification="SEND_RESPONSE", fIsPostNotificationEvent="false", NotificationStatus="NOTIFICATION_CONTINUE" 19:02:16.701
    92. — NOTIFY_MODULE_START ModuleName="WindowsAuthenticationModule", Notification="SEND_RESPONSE", fIsPostNotification="false" 19:02:16.701
    93. — NOTIFY_MODULE_END ModuleName="WindowsAuthenticationModule", Notification="SEND_RESPONSE", fIsPostNotificationEvent="false", NotificationStatus="NOTIFICATION_CONTINUE" 19:02:16.701
    94. — NOTIFY_MODULE_START ModuleName="BasicAuthenticationModule", Notification="SEND_RESPONSE", fIsPostNotification="false" 19:02:16.701
    95. — NOTIFY_MODULE_END ModuleName="BasicAuthenticationModule", Notification="SEND_RESPONSE", fIsPostNotificationEvent="false", NotificationStatus="NOTIFICATION_CONTINUE" 19:02:16.701
    96. — NOTIFY_MODULE_START ModuleName="ProtocolSupportModule", Notification="SEND_RESPONSE", fIsPostNotification="false" 19:02:16.701
    97. — NOTIFY_MODULE_END ModuleName="ProtocolSupportModule", Notification="SEND_RESPONSE", fIsPostNotificationEvent="false", NotificationStatus="NOTIFICATION_CONTINUE" 19:02:16.701
    98. — NOTIFY_MODULE_START ModuleName="IsapiFilterModule", Notification="SEND_RESPONSE", fIsPostNotification="false" 19:02:16.701
    99. FILTER_SEND_RESPONSE_START HttpStatus="404" 19:02:16.701
    100. FILTER_START FilterName="C:\MyProjects\GAHelper Project - Testing\x64\Release\GAHelper.dll" 19:02:16.701
    101. FILTER_END NotificationStatus="SF_STATUS_REQ_NEXT_NOTIFICATION" 19:02:16.701
    102. FILTER_SEND_RESPONSE_END  19:02:16.701
    103. FILTER_SEND_RAW_DATA_START  19:02:16.701
    104. FILTER_START FilterName="C:\MyProjects\GAHelper Project - Testing\x64\Release\GAHelper.dll" 19:02:16.701
    105. FILTER_END NotificationStatus="SF_STATUS_REQ_NEXT_NOTIFICATION" 19:02:16.701
    106. FILTER_SEND_RAW_DATA_END  19:02:16.701
    107. FILTER_END_OF_REQUEST_START  19:02:16.701
    108. FILTER_START FilterName="C:\MyProjects\GAHelper Project - Testing\x64\Release\GAHelper.dll" 19:02:16.701
    109. FILTER_END NotificationStatus="SF_STATUS_REQ_NEXT_NOTIFICATION" 19:02:16.701
    110. FILTER_END_OF_REQUEST_END  19:02:16.701
    111. — NOTIFY_MODULE_END ModuleName="IsapiFilterModule", Notification="SEND_RESPONSE", fIsPostNotificationEvent="false", NotificationStatus="NOTIFICATION_CONTINUE" 19:02:16.701
    112. — NOTIFY_MODULE_START ModuleName="DynamicCompressionModule", Notification="SEND_RESPONSE", fIsPostNotification="false" 19:02:16.701
    113. — NOTIFY_MODULE_END ModuleName="DynamicCompressionModule", Notification="SEND_RESPONSE", fIsPostNotificationEvent="false", NotificationStatus="NOTIFICATION_CONTINUE" 19:02:16.701
    114. — NOTIFY_MODULE_START ModuleName="HttpCacheModule", Notification="SEND_RESPONSE", fIsPostNotification="false" 19:02:16.701
    115. — NOTIFY_MODULE_END ModuleName="HttpCacheModule", Notification="SEND_RESPONSE", fIsPostNotificationEvent="false", NotificationStatus="NOTIFICATION_CONTINUE" 19:02:16.701
    116. — NOTIFY_MODULE_START ModuleName="CustomErrorModule", Notification="SEND_RESPONSE", fIsPostNotification="false" 19:02:16.701
    117. — NOTIFY_MODULE_END ModuleName="CustomErrorModule", Notification="SEND_RESPONSE", fIsPostNotificationEvent="false", NotificationStatus="NOTIFICATION_CONTINUE" 19:02:16.701
    118. GENERAL_FLUSH_RESPONSE_START  19:02:16.701
    119. — GENERAL_RESPONSE_ENTITY_BUFFER Buffer="HTTP/1.1 404 Not Found
    Content-Length: 0
    Server: Microsoft-IIS/7.5
    X-Powered-By: ASP.NET

    " 19:02:16.701
    120. GENERAL_FLUSH_RESPONSE_END BytesSent="95", ErrorCode="The operation completed successfully.
     (0x0)" 19:02:16.701
    121. GENERAL_REQUEST_END BytesSent="95", BytesReceived="620", HttpStatus="404", HttpSubStatus="0" 19:02:16.701

    Wednesday, August 3, 2011 3:05 PM
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    User-248641251 posted

    Tried that, still didn't work :-( The following is the failed request log for the request.
    Where I am seeing a problem is that the CustomErrorModule never seems to load... but I can't figure out why...
    116. - NOTIFY_MODULE_START ModuleName="CustomErrorModule", Notification="SEND_RESPONSE", fIsPostNotification="false" 19:02:16.701
    117. - NOTIFY_MODULE_END ModuleName="CustomErrorModule", Notification="SEND_RESPONSE", fIsPostNotificationEvent="false", NotificationStatus="NOTIFICATION_CONTINUE" 19:02:16.701
    118. GENERAL_FLUSH_RESPONSE_START  19:02:16.701
    119. - GENERAL_RESPONSE_ENTITY_BUFFER Buffer="HTTP/1.1 404 Not Found
    Content-Length: 0
    Server: Microsoft-IIS/7.5
    X-Powered-By: ASP.NET
    " 19:02:16.701
    120. GENERAL_FLUSH_RESPONSE_END BytesSent="95", ErrorCode="The operation completed successfully.
     (0x0)" 19:02:16.701
    121. GENERAL_REQUEST_END BytesSent="95", BytesReceived="620", HttpStatus="404", HttpSubStatus="0" 19:02:16.701

    IMO, CustomErrorModule changes response.
    At least trace showes it.
    Don't know how it can do it if it's "never get loaded".
    You can disable CustomErrorModule (and confirm with trace) to see if it changes anything.
    Wednesday, August 3, 2011 3:43 PM
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    User45572240 posted

    I tried disabling it and received the same response.

     From what I can see, the CustomErrorModule is what loads the custom 404 page. 

     When the ISAPI filter is turned off the trace looks like this.  Notice the CustomErrorModule NOTIFY_MODULE_START and then it proceeds to load the 404 page (test.aspx) which the above trace does not do.

    186. — NOTIFY_MODULE_START ModuleName="CustomErrorModule", Notification="SEND_RESPONSE", fIsPostNotification="false" 17:30:39.623
    187.  GENERAL_SEND_CUSTOM_ERROR HttpStatus="404", HttpSubStatus="0", FileNameOrURL="/test.aspx" 17:30:39.623
    188.  GENERAL_CHILD_REQUEST_START SiteId="39", RequestURL="http://test.andy.me:80/test.aspx?404;http://test.andy.me:80/taxes", RequestVerb="GET", RecursiveLevel="1" 17:30:39.623
    189.  GENERAL_REQUEST_START SiteId="39", AppPoolId="Test 4.0", ConnId="1610612909", RawConnId="0", RequestURL="http://test.andy.me:80/test.aspx?404;http://test.andy.me:80/taxes", RequestVerb="GET"

    Wednesday, August 3, 2011 4:05 PM
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    User-248641251 posted

    I tried disabling it and received the same response.

    All I can tell - CustomErrorModule is the cause.

    I assume, it's integrated pipeline, right?
    Get fresh computer or VM, put simple an aspx page returning 404 status and some custom text.
    Open page - you'll get 404 without your custom text

    Change
    <configuration>
    <system.webServer>
    <httpErrors existingResponse="PassThrough" />

    Open page again - you'll get 404 with your custom text

    Once you make it work, bring your ISAPI filter into picture.

    Wednesday, August 3, 2011 7:32 PM
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    User1866599147 posted
    I couldn't find a solution to this issue, so as a workaround I'm sending a custom Site Access denied message with HTTP 404, instead of 403. This serves the purpose and my custom message appears. In my original post, I mentioned that this problem appears in case of 404 and 403. But when I checked today, the problem came only for a 403. Probably I made a mistake when making the first post. I tried the solutions given above and by setting existingResponse to "PassThrough", the problem was not solved. However I also stopped getting the regular IIS message which i used to get with my filter removed. Also removing the CustomErrorModule didn't help fix the issue.
    Thursday, August 4, 2011 4:49 AM
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    User-1598853383 posted

    I might be on the wrong track, but still I think it is worth a try to inform you. I got blank pages on my new IIS website when I browsed for a non-existing page. I wanted to get a 404 error screen though.

    I executed the following steps;
    *. Open the control panel of Windows (in my case Windows 10 Home Version 10.0.15063)
    *. Choose Programs and Features
    (The Windows Features window should now be opened)
    *. Open Internet Information Services
    *. Open World Wide Web Services
    *. Open Common HTTP Features
    *. Set HTTP Errors to on
    *. Touch button OK

    For us Dutch only:

    Ik heb de volgende stappen uitgevoerd;
    *. Open het configuratiescherm van Windows (in mijn geval Windows 10 Home Versie 10.0.15063)
    *. Kies Windows-onderdelen in- of uitschakelen
    (Venster Windows-onderdelen moet nu getoond zijn)
    *. Open Internet Information Services
    *. Open World Wide Web-services
    *. Open Veelvoorkomende HTTP-functies
    *. Vink HTTP-fouten aan
    *. Raak knop OK aan

    Wednesday, July 19, 2017 12:52 PM
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    User1295159516 posted

    have some trouble :( 

    99 domino online

    Monday, July 2, 2018 4:59 AM