Request headers are missing from fetch requests

[greg]

Hi,

Since that request would be made from your app to the third-party, you could indeed manually add whatever headers you like to the request. Like when calling an external API, you might send an Authorization header.

However those Fly-added headers would be for ones that come in, routed via its proxy. For example if you request https://debug.fly.dev/ that would hit Fly’s proxy, and then on to the app. You’ll see on screen (or in the network tab) the headers. Sure enough, there is a Fly-Client-IP (etc).

The problem you may face here is that Fly don’t provide an official way to get a fixed outgoing IP for you to whitelist. For example see:

Set/get outgoing IP address for whitelisting on external APIs/Hosts

Hi there, I don’t think this is something that Fly currently does, but is there any way to set an IP address (or a list/range) that a fly app will use to make requests to external hosts? I’d really like to be able to reliably whitelist Fly apps by IP/list/range/whatever. I run reverse proxies, and occasionally one or more Fly IPs will get blacklisted by an external host. Since some requests go out through different Fly IP addresses to the external host, we get an intermittent “sometimes it mak…