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http://fetch.spec.whatwg.org/#fetching [[ 1. Modify request's url per HTTP Strict Transport Security, if applicable. [HSTS] ]] In terms of step 1 in the Fetch alg -- by "Modify request's url per HTTP Strict Transport Security" I suggest re-writing it more precisely along these lines.. 1. Determine whether the url refers to a Known HSTS Host by applying the algorithm given in RFC6797's section "8.3. URI Loading and Port Mapping" to the request's url. This algorithm handles any needed url re-writing, and is idempotent otherwise. HTH, =JeffH
https://github.com/whatwg/fetch/commit/6ae0b8e2bbf7362396eb697203753d09cfca6ea0