1.7 Detect when called from within callbacks
1.8 Allow SSL (HTTPS) to proxy
1.9 Cache negative name resolves
+ 1.10 Support IDNA2008
2. libcurl - multi interface
2.1 More non-blocking
A name resolve that has failed is likely to fail when made again within a
short period of time. Currently we only cache positive responses.
+1.10 Support IDNA2008
+
+ International Domain Names are supported in libcurl since years back, powered
+ by libidn. libidn implements IDNA2003 which has been superseded by IDNA2008.
+ libidn2 is an existing library offering support for IDNA2008.
+
2. libcurl - multi interface