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<p class="MsoNormal"><span style="font-size:11.0pt">I need some thoughts on this problem.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">I am load balancing upstream servers, two are IIS servers on VMs and one is an Azure App Service (PaaS) web app. During deployment the apps are shut down and reloaded. The problem is that the Azure web app
returns a 403 when it is shut down, so Nginx serves stale content. But the IIS servers return a 404 error. Since we don’t serve stale content to a 404 (nor would we want to) it means that we need to come up with a solution to work around this.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">The only thing I can tell is that when the IIS site is turned off there is a response header of Connection: close. But if I start the site up and force a 404 error, I get this header which does not appear
when the site is turned off: X-Powered-By: ASP.NET.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">My question is if there is a way to manipulate the values in the proxy_cache_use_stale to include http_404 but only under special circumstances. Or if there is some other way to include some logic that would
allow me at the server block level to force serving stale content.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">I appreciate any thoughts/ideas how to overcome this. I’ve tried to find out if I can force IIS to serve a 403 error and have not had much luck and in all honesty, I am trying not to customize IIS and would
rather focus customization on Nginx configuration files.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">Thanks,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">-mike<o:p></o:p></span></p>
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<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;color:#44546A">___________________________________________<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;color:#44546A">Michael Friscia<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;color:#44546A">Office of Communications<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;color:#44546A">Yale School of Medicine<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;color:#44546A">(203) 737-7932 - office<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;color:#44546A">(203) 931-5381 - mobile<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;color:#44546A"><a href="http://web.yale.edu/"><span style="color:#44546A">http://web.yale.edu</span></a><o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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