Strict Transport Security

- OTHER

Declare that a website is only accessible over a secure connection (HTTPS).

Chrome

  1. 4 - 108: Supported
  2. 109: Supported
  3. 110 - 112: Supported

Edge

  1. 12 - 108: Supported
  2. 109: Supported

Safari

  1. 3.1 - 6.1: Not supported
  2. 7 - 16.2: Supported
  3. 16.3: Supported
  4. TP: Supported

Firefox

  1. 2 - 3.6: Not supported
  2. 4 - 108: Supported
  3. 109: Supported
  4. 110 - 111: Supported

Opera

  1. 9 - 11.6: Not supported
  2. 12 - 93: Supported
  3. 94: Supported

IE

  1. 5.5 - 10: Not supported
  2. 11: Supported

Chrome for Android

  1. 109: Supported

Safari on iOS

  1. 3.2 - 6.1: Not supported
  2. 7 - 16.2: Supported
  3. 16.3: Supported

Samsung Internet

  1. 4 - 18.0: Supported
  2. 19.0: Supported

Opera Mini

  1. all: Not supported

Opera Mobile

  1. 10 - 12.1: Not supported
  2. 73: Supported

UC Browser for Android

  1. 13.4: Supported

Android Browser

  1. 2.1 - 4.3: Not supported
  2. 4.4 - 4.4.4: Supported
  3. 109: Supported

Firefox for Android

  1. 109: Supported

QQ Browser

  1. 13.1: Supported

Baidu Browser

  1. 13.18: Supported

KaiOS Browser

  1. 2.5: Supported

The HTTP header is 'Strict-Transport-Security'.

Resources:
MDN Web Docs - Strict Transport Security
Chromium article
OWASP article