I've set up a development environment on my MacBook Pro M1 (running Big Sur 
11.2.3, Go 1.16.2) with a number of small Go/.Net HTTP APIs that are 
communication with each other. To replicate our production infrastructure 
I've set up /etc/hosts with ".local" domains pointing to 127.0.0.1. An 
nginx server then proxies the requests to the APIs. A self signed 
certificate is used for https.

Whenever an HTTP request is sent from a Go application to any of the 
".local" APIs, 5 seconds are added to the response time. This delay is not 
added when I use a browser to make the request, neither if I call an 
external address (for example google.com) or "localhost" from the Go code. 
It only happens when I use http.Client to request a ".local" domain and the 
behavior is consistent. 

I've searched the Go standard library for a "5 * time.Second" and found it 
only in a few places, including src/net/dnsconfig_unix.go so I guess it's 
related to the name resolution.

Anyone got an idea about what's wrong and how it can be fixed? 

/Jonathan

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