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I have successfully built a standalone SOAP Server that works great. I now want to deploy it to an IIS10 server on windows 10. I have some across many helpful articles that helped me to add the Virtual Application, configure the Application Pool, set folder permissions and enable ISAPI and CGI. I compiled he Service into an ISAPI DLL deployed as recommended but the only response I get back is ERR_INVALID_HTTP_RESPONSE. Does anyone have an idea as to what I am doing wrong? What should my URL be? http://localhost/eFileSvr/wsdl yields the same error.

This is what I expect: enter image description here

Instead I get:

ERR_INVALID_HTTP_RESPONSEERR_INVALID_HTTP_RESPONSE

Marc Phillips
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  • The modern approach now is to let your Delphi app run as a web server on its own, and hook up to IIS with HttpPlatformHandler, https://halfblood.pro/the-rough-history-of-iis-httpplatformhandler/ Since you claimed that you "built a standalone SOAP Server that works great", I think what's remaining is how to allow your server to take desired port number from IIS configuration and you have tons of examples from other languages to learn from. – Lex Li Jun 28 '23 at 21:26
  • Did you install the required features? (related question: https://stackoverflow.com/questions/33483350/how-do-i-enable-isapi-dlls-for-iis-10-on-windows-10) – Brian Jun 28 '23 at 22:10
  • Try to enable FRT get trace logs, or use Error Page in IIS set the site to return detailed errors to browser. – TengFeiXie Jun 29 '23 at 07:09
  • Thanks for the advice. I did install and configure the required features listed in the article which lead me to believe there must be another issue so I created the test Echo Service and installed the ISAPI.DLL and it worked as expected. So I must be missing something like runtime packages or DLL's. Is there a good tool/method to identify the required packages/DLL's? – Marc Phillips Jun 29 '23 at 15:18
  • Process Monitor will help you find any missing files (many times, they aren't in the path) https://learn.microsoft.com/en-us/sysinternals/downloads/procmon – John Easley Jun 29 '23 at 19:48

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