Qt Network
- New SSL back-end for iOS and OS X based on Secure Transport. Note that in Qt 5.6 this will become the default SSL: back-end on these platforms.
- Support for libproxy
- Support for TLS PSK ciphersuites
- Support for elliptic curve certificates
- Ability to select specific curves when using elliptic curve ciphersuites.
http://wiki.qt.io/New_Features_in_Qt_5.5
Qt Network
- Added QHostAddress::isMulticast()
- Support HTTP redirection in QNetworkAccessManager
http://wiki.qt.io/New_Features_in_Qt_5.6
Qt Network
- Support for TLS PSK ciphersuites on server side
- Support for configurable diffie hellman parameters
- Support for HTTP/2 in Network Access Manager
http://wiki.qt.io/New_Features_in_Qt_5.8
Qt Network
- Added HSTS support (HTTP Strict Transport Security) to QNetworkAccessManager
- Added redirects policy to QNetworkAccessManager (ManulRedirectsPolicy, NoLessSafeRedirectsPolicy, SameOriginRedirectsPolicy, UserVerifiedRedirectsPolicy)
http://wiki.qt.io/New_Features_in_Qt_5.9
Qt5.5以来对Network的改进（包括对SSL的功能支持，HTTP的重定向等等）
原文：http://www.cnblogs.com/findumars/p/6366505.html
