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Update app-services page to include network-debugging tip #2099

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Update app-services page to include network-debugging tip #2099

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2 changes: 1 addition & 1 deletion networking/app-services.html.md
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Expand Up @@ -147,7 +147,7 @@ cURL is a useful tool for checking that a service is reachable where it should b

[3] [Except UDP services.](#udp-is-special)

[4] If this fails, but the local check succeeded, the next thing to confirm is that the app or Machine config includes a properly configured `services` or `http_service` section, with `internal_port` matching `<port>` used in this test.
[4] If this fails, but the local check succeeded, the next thing to confirm is that the app or Machine config includes a properly configured `services` or `http_service` section, with `internal_port` matching `<port>` used in this test. Some environments still run IPv4 only, so you may need to assign your app a shared IPv4 address to keep it reachable from those networks.

[5] The HTTP URL always elicits a 301 redirect, because the Fly Proxy upgrades HTTP connections to HTTPS. To get cURL to follow the redirect to see if there's anything there, use the `-L` flag. This example has the services configured to handle HTTP and HTTPS requests on the conventional ports 80 and 443 respectively; if you're using different ports, substitute those in.

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