Portier

Portier is an email-based, passwordless authentication service
that you can (but don't have to) host yourself.

fullstory

Serverless

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Drupal 360

Structured Data Schema

The provided host name is not valid for this server.

This error message is coming a feature that was added to Drupal 8 to protect against HTTP Host header attacks. The feature is also described in the change record that was generated for the patch.

Essentially, is was possible to spoof the HTTP Host header for nefarious purposes, and trick Drupal into using a different domain name in several subsystems (particularly link generation). In other words, the HTTP Host header needs to be considered user input, and not trusted.

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