HTTP - Strict Transport Security (HSTS) - mandatory HTTPS

About

Strict Transport Security (HSTS) is a header that tell the client that the website should always be contacted with HTTPS

Effect

When HSTS is on, if it's not possible to make a https connection (for instance if the certificate is not valid), the user will not be able to navigate the website and will get this message.

Management

Set

Example with Apache - HTTP Header (mod_header module)

Header set Strict-Transport-Security "max-age=63072000; includeSubDomains"

Hardcoded in chrome (preload)

To submit domains for hard coded inclusion in Chrome's HTTP Strict Transport Security (HSTS) preload list:

  • Add the preload tag to the value
Header set Strict-Transport-Security "max-age=63072000; includeSubDomains; preload"

Delete

In chrome

chrome://net-internals/#hsts
  • then delete

Documentation / Reference


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