Fix default binding behaviour

On some platforms, binding to to both "::" and "0.0.0.0" at the same
time is not allowed because "::" may already accepts ipv4 connections.
For other platforms, binding to both is necessary to support ipv4 and
ipv6.

This platform-specific behaviour is due to the variation in the
default value for the socket option "IPV6_ONLY".

Fix this by always setting the "IPv6_ONLY" sockopt to true!

1 files changed, 1 insertions, 0 deletions

diff --git a/Cargo.toml b/Cargo.toml
index 4efc015..f72597a 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -53,6 +53,7 @@ http = "0.2"
 bytes = "1"
 atty = "0.2"
 rustls = { version = "0.19", optional = true }
+socket2 = "0.4"
 
 [features]
 default = ["tls"]