How to fix Chrome that redirects localhost to https


I was developing in angular and used url http://localhost:4200. Suddenly, Chrome gave me the following error: ERR_SSL_PROTOCOL_ERROR

SSL? When looking at the url, I saw that Chrome added https… When I changed it back to http, Chrome forces https again…

After some research, I found a solution on with the following explanation:

  • I believe this is caused by HSTS – see
  • If you have (developed) any other localhost sites which send a HSTS header…
  • eg. Strict-Transport-Security: max-age=31536000; includeSubDomains; preload
  • …then depending on the value of max-age, future requests to localhost will be required to be served over HTTPS.

To fix this, got to this url: chrome://net-internals/#hsts

Scroll all the way down to Delete domain security policies. Then, type localhost in the input field and press delete.

After that, localhost should be accessible again under http.

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