I can replicate the bug, it occurs since https-first (till now) only consider downgrades for error status between 400 - 511 (https://searchfox.org/mozilla-central/source/dom/security/nsHTTPSOnlyUtils.cpp#474-475). That should probably adjust to 400 - 525.
Bug 1747673 Comment 2 Edit History
Note: The actual edited comment in the bug view page will always show the original commenter’s name and original timestamp.
I can reproduce the bug. It occurs since https-first (till now) only consider downgrades for error status between 400 - 511 (https://searchfox.org/mozilla-central/source/dom/security/nsHTTPSOnlyUtils.cpp#474-475). That should probably adjust to 400 - 525.
I can reproduce the bug. It occurs since https-first (till now) only consider to downgrade request with a response error status between 400 - 511 (https://searchfox.org/mozilla-central/source/dom/security/nsHTTPSOnlyUtils.cpp#474-475). That should probably adjust to 400 - 525.
I can reproduce the bug. It occurs since https-first (till now) only consider to downgrade requests with a response error status between 400 - 511 (https://searchfox.org/mozilla-central/source/dom/security/nsHTTPSOnlyUtils.cpp#474-475). That should probably adjust to 400 - 525.