HTTPS Upgrades doesn't avoid mixed content error

[mKoonrad]

Description

HTTPS Upgrades doesn't avoid mixed content error. When on page I have http image link that redirects to other https link I can see mixed content error.

When I have installed on my Brave browser additional HTTPS Everywhere extension (it should do the same thing) I can see on network timeline just second https request and browser doesn't cause mixed content error.

Steps to Reproduce

1. Open page with http link that redirect to other https resource. I can't provide example link because it's example from my webmail page.

Actual result:

Mixed content error

Expected result:

No mixed content issue like with installed HTTPS Everywhere extension

Reproduces how often:

Every time in cases above

Brave version (brave://version info)

Brave 1.4.96 Chromium: 80.0.3987.132 (Official Build) (64-bit)
Revision fcea73228632975e052eb90fcf6cd1752d3b42b4-refs/branch-heads/3987@{#974}
OS Windows 10 OS Version 1909 (Build 18363.720)
JavaScript V8 8.0.426.26
Flash (Wyłączone)
User Agent Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/80.0.3987.132 Safari/537.36
Command Line "C:\Program Files (x86)\BraveSoftware\Brave-Browser\Application\brave.exe" --enable-dom-distiller --disable-domain-reliability --no-pings --extension-content-verification=enforce_strict --extensions-install-verification=enforce --sync-url=https://no-thanks.invalid --enable-features=PasswordImport,WebUIDarkMode,SimplifyHttpsIndicator --disable-features=NotificationTriggers,AllowPopupsDuringPageUnload,LookalikeUrlNavigationSuggestionsUI,AutofillServerCommunication,AudioServiceOutOfProcess,SmsReceiver,WebXR,VideoPlaybackQuality,WebXrGamepadModule --flag-switches-begin --flag-switches-end --enable-audio-service-sandbox --disable-webrtc-apm-in-audio-service --disable-sync
Executable Path C:\Program Files (x86)\BraveSoftware\Brave-Browser\Application\brave.exe
Profile Path C:\Users\User\AppData\Local\BraveSoftware\Brave-Browser\User Data\Default
Variations 5e3a236d-4113a79e

Version/Channel Information:

• Can you reproduce this issue with the current release? Yes

Other Additional Information:

• Does the issue resolve itself when disabling Brave Shields? Yes
• Does the issue resolve itself when disabling Brave Rewards? Yes
• Is the issue reproducible on the latest version of Chrome? Yes

[bsclifton]

This should be fixed now with brave/brave-core#4537 😄

The fix is in 1.7 and later. 1.7 will be released early next week! You can also try a release candidate here:
https://github.com/brave/brave-browser/releases/tag/v1.7.90