When the chrome process dies and we try to read STDIN/STDERR, we get
`ValueError: I/O operation on closed file` or
`OSError: [Errno 9] Bad file descriptor`.
We modify `readline_nonblock` method to return the buffer it read up to
this point.
If you use a JS behavior timeout smaller than 7 sec, the JS behavior
will always need 7 sec because `sleep(7)` is hard-coded there.
We make a minor addition to use `min(timeout, 7)` for sleep so it will
finish faster when using a smaller JS behavior timeout.
We used `self.headers.getheader` which no longer works. We replace it
with `self.headers.get`.
We change the code to write binary data to `self.wfile` because we get
an exception for writing str and/or None.
which encumbers the validation with additional requirements,
specifically makes it difficult to validate a subclass of `dict` because
it expects a constructor that works like dict.__init__()
see https://travis-ci.org/internetarchive/brozzler/jobs/514858838
(unroll "sudo cat /var/log/brozzler-worker.log")
2019-04-02 20:16:01,792 18595 CRITICAL BrozzlingThread:42073 brozzler.worker.BrozzlerWorker.brozzle_site(worker.py:412) unexpected exception
Traceback (most recent call last):
File "/opt/brozzler-ve3/lib/python3.6/site-packages/brozzler/worker.py", line 379, in brozzle_site
enable_youtube_dl=not self._skip_youtube_dl)
File "/opt/brozzler-ve3/lib/python3.6/site-packages/brozzler/worker.py", line 215, in brozzle_page
browser, site, page, on_screenshot, on_request)
File "/opt/brozzler-ve3/lib/python3.6/site-packages/brozzler/worker.py", line 292, in _browse_page
cookie_db=site.get('cookie_db'))
File "/opt/brozzler-ve3/lib/python3.6/site-packages/brozzler/browser.py", line 341, in start
self.websock_url = self.chrome.start(**kwargs)
File "/opt/brozzler-ve3/lib/python3.6/site-packages/brozzler/chrome.py", line 200, in start
return self._websocket_url()
File "/opt/brozzler-ve3/lib/python3.6/site-packages/brozzler/chrome.py", line 247, in _websocket_url
raise e
Exception: chrome process died with status 1
