Strict Transport Security
- OTHERDeclare that a website is only accessible over a secure connection (HTTPS).
Chrome
- 4 - 124: Supported
- 125: Supported
- 126 - 128: Supported
Edge
- 12 - 123: Supported
- 124: Supported
Safari
- 3.1 - 6.1: Not supported
- 7 - 17.4: Supported
- 17.5: Supported
- 17.6 - TP: Supported
Firefox
- 2 - 3.6: Not supported
- 4 - 125: Supported
- 126: Supported
- 127 - 129: Supported
Opera
- 9 - 11.6: Not supported
- 12 - 108: Supported
- 109: Supported
IE
- 5.5 - 10: Not supported
- 11: Supported
Chrome for Android
- 124: Supported
Safari on iOS
- 3.2 - 6.1: Not supported
- 7 - 17.4: Supported
- 17.5: Supported
- 17.6: Supported
Samsung Internet
- 4 - 23: Supported
- 24: Supported
Opera Mini
- all: Not supported
Opera Mobile
- 10 - 12.1: Not supported
- 80: Supported
UC Browser for Android
- 15.5: Supported
Android Browser
- 2.1 - 4.3: Not supported
- 4.4 - 4.4.4: Supported
- 124: Supported
Firefox for Android
- 125: Supported
QQ Browser
- 14.9: Supported
Baidu Browser
- 13.52: Supported
KaiOS Browser
- 2.5: Supported
- 3: Supported
The HTTP header is 'Strict-Transport-Security'.