Server
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This request
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All headers
Public APIs
Called by the server, so every call leaves through the Azure Firewall. A call to a host outside its allow-list fails at the TLS handshake.
Inside the VNet
Private DNS
TCP through the NSGs
Instance metadata
Streaming
Load and transfer
WAF probe
Sends attack-looking query strings. In Prevention mode Front Door answers 403; in Detection mode they reach the app and are only logged.
Background heartbeat
A hosted service checks the outbound IP once a minute.