chromium devtools 404

gistfile1.txt

chrome-devtools-frontend.appspot.com returns "404 Not Found"

When using devtools for remote debugging, the devtools version must match the 
target browser version for compatibility. To achieve this the commit hash is 
used to remote fetch the devtools. On arch and perhaps other distros, the 
commit hash does not match the hash used for retrieving the corresponding 
devtools (the correct hash is the parent commit hash due to an extra commit 
during build - apparently). To resolve this you can determine the correct 
hash and manually replace it in the url or modify the binary to the correct 
hash.

To determine your current hash:
    chromium --remote-debugging-port=9222
    localhost:9222/json/version
    The hash is specified in the WebKit-Version field following the @

To determine the correct / devtools hash:
    Lookup current hash at https://chromium.googlesource.com/chromium/src/+/<hash>
    The correct hash is the parent commit hash

Then you can modify the url eg: https://chrome-devtools-frontend.appspot.com/serve_file/@<hash>/inspector.html?ws=localhost:9222/devtools/page/...&remoteFrontend=true

Alternatively, modify the remote chromium library binary /usr/lib/chromium/chromium
    Search for the _full_ current hash, replace with correct hash
    Confirm changes using the same method used to determine current hash

Keywords:
chromium
chrome
devtools
404
not found
chrome-devtools-frontend.appspot.com
ERROR:CONSOLE(0)] "XMLHttpRequest cannot load https://chrome-devtools-frontend.appspot.com/serve_file/
inspector.js:22 Empty response arrived for script 'http://localhost:9222/devtools/screencast/screencast_module.js'
ERROR:CONSOLE(22)] "Empty response arrived for script 'chrome-devtools://devtools/bundled/screencast/screencast_module.js'", source: chrome-devtools://devtools/bundled/inspector.js (22)
ERROR:CONSOLE(109)] "Uncaught (in promise) Error: Could not instantiate: Screencast.ScreencastAppProvider", source: chrome-devtools://devtools/bundled/inspector.js (109)
ERROR:CONSOLE(109)] "Uncaught (in promise) Error: Could not instantiate: ProductRegistryImpl.Registry", source: chrome-devtools://devtools/bundled/inspector.js (109)