On Wed, 2 Dec 2015, Fatemah Alharbi wrote:
I’m using the latest version of Firefox on my Windows 10 Home edition and Linux Ubuntu 14.04 LTS desktops. I noticed that Firefox always sends two DNS requests: A and AAAA requests. I did an experiment to see which API is used by Firefox and found that the API getaddrinfo() does send 2 DNS requests on my Linux machine while it sends only one A request on my Windows machine. This doesn’t guarantee that Firefox always uses this API. Does Firefox uses multiple APIs depending on the OS? I would like to know which API does Firefox use when sending DNS requests.
Firefox uses getaddrinfo() both on Windows and Linux. See netwerk/dns/GetAddrInfo.cpp (the bigger part of that being special Android code). The differences you see between Windows and Linux, I guess is because of differences in IPv6 setup or connectivity somehow. Or possibly due to getaddrinfo() implementation differences. I didn't spot any IPv6/IPv4 differences between platforms in the Firefox name resolving code.
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