ReferenceError: HAR is not defined

[ghost]

I'm using HAR Export Trigger with Firefox 42 on Linux.

The scenario in which I get this error message:
I open firefox from commandline with an URL to my website on which the script to export the HAR data is run after a timeout of a few seconds.
If the netmonitor in firefox is not open while the export function is run, I get the error message "ReferenceError: HAR is not defined".
If I open the netmonitor manually before the export is run, everything is exported and the problem doesn't occur.
My problem is that firefox doesn't start the netmonitor automatically, but for my testing environment it is necessary that the export process runs automatically.

I'm not really sure if this is a problem that can't be fixed, because firefox can't export the data without an opened netmonitor, or if it is a problem with the har-export-trigger extension, so sorry if this is the wrong place to report this problem.

[janodvarko]

This is the right place to report the problem.

I believe that the Developer toolbox must be open and any panel selected. I would actually recommend to select different panel than the "Network" since this panel can slow down page load and influence collected timing data.

So yes, opening the Toolbox is necessary at the moment (it initializes the devtools backend services that are required by HAR Export Trigger extension) and you can do it by sending F12 key event to the browser.

I'll yet explore more if it possible to have HAR Export Trigger working without the Toolbox being open, but it might take some time.

Honza

[soulgalore]

Hey @janodvarko ,
wow I love what you have done with this! It's super cool that it's finnally possible to automate HAR creation using Selenium. We have started looking into to start using the har-export-trigger in Browsertime/sitespeed.io to be able to collect the HAR from from Firefox but struggling with opening the toolbox automatically. Do you know if there's a away of configuring it to always be open with about:config? Been trying a lot of different things but seems like nothing works for me.

Best
Peter

P.S again the HAR exporter is really awesome :D

[janodvarko]

I don't know about such option (asking around to double check), but the question is how this should work. Do you mean that the Toolbox should be opened automatically for the first selected browser tab (after Firefox start), or for every opened tab? Or there should be two options?

Also Toolbox opening is asynchronous, so does the automation need an event saying "toolbox-ready"..? (e.g. sent to the page window just like "har-api-ready" event)?.

Those things could be part of this extension I guess.

Honza

[soulgalore]

I mean for me it doesn't matter how, more that it would be clean if we could find a way to skip opening it. or at least find a way to automatically do it when we open a new browser.

[janodvarko]

OK, yes, I need to explore how to do all the automation without the Toolbox being open.

Honza

[soulgalore]

We gonna try just using the F12 from Selenium for now, but if there's possible to get rid of that it would be perfect. Thanks again for all the great work!

[janodvarko]

Great, thanks, let me know if there are any additional features (apart the toolbox-not-needed) that could yet simplify the automation.

Honza

[janodvarko]

I reported a new issue related to toolbox-not-needed #11

Honza

[janodvarko]

And I believe I can close this one.

Honza