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We had to introduce a web page to bootstrap the web version of devtools because since https://bugs.chromium.org/p/chromium/issues/detail?id=1232509 chrome debugger port no longer serve such a page via HTTP.

The URL also changed, /serve_file/@{version_hash}. pattern is no longer used, both the devtools and the websocket endpoint are in /devtools

The test was made a bit more complete by actually making requests and trying to connect to websocket endpoints.

Some problems were found with incognito and block-new-web-contents options:

• they are boolean type, but the software parameter serialisation is XML, which as of today does not support boolean types. This is left TODO for now
• When both --incognito and --block-new-web-contents are true, the command line flag was --incognito--block-new-web-contents, which is unknown and was ignored. Some minimal changes are included to fix this.