I've configured IIS to act as a reverse proxy for a development server (dartlang's pub serve if you're curious). I'm doing this because the development server doesn't support custom error pages and I need them to be working locally. I've set up the custom error page in IIS but it's not serving it -- it's passing through the default 404 page from the source server. Is it possible to make the reverse proxy serve it's own custom page for 404 errors?
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Late to the party, but here you go: when using IIS 7+ as a reverse proxy, you can configure it to use its own error pages (custom or otherwise) by adding the following to web.config:
<system.webServer>
<httpErrors existingResponse="Replace"/>
</system.webServer>
More info in the docs...
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fatpanther
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