Issue with getChromeProfile and --headless - RSelenium

[moreno....@carloalberto.org]

Daar all,

I'm struggling with a problem which might be related to Chromedriver. 

When I try to open a remoteDriver from RSelenium with the --user-data-dir/--profile-directory, together with the --headless option, Chromedriver apparently freezes. This happens only on Windows and MacOs (it seems to work with Ubuntu). I use Chrome 67. Below you can find the code to replicate the issue:

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library(RSelenium) #===== user_path <- "C:/Users/Moreno/Desktop/Chrome_profile"

cDrv <- wdman::chrome(version = "2.40", verbose = FALSE, check = TRUE) #===== Include options eCaps <- RSelenium::getChromeProfile(dataDir = user_path, profileDir = "Profile 1") eCaps$chromeOptions$args[[3]] <- "--headless" eCaps$chromeOptions$args[[4]] <- "--disable-notifications" #===== Initialize driver remDr <- RSelenium::remoteDriver(remoteServerAddr = "localhost", browserName = "chrome", port = 4567L, extraCapabilities = eCaps) #===== Launch driver remDr$open()

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If I remove alternatively the ""--headless" and the "--user-data-dir/--profile-directory" options, everything works perfectly, but if I combine the options, in Windows and MacOs, after "remDr$open()" I obtain the following:

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[1] "Connecting to remote server" Selenium message:unknown error: unable to discover open pages (Driver info: chromedriver=2.40.565498 (ea082db3280dd6843ebfb08a625e3eb905c4f5ab),platform=Windows NT 10.0.17134 x86_64) Error: Summary: UnknownError Detail: An unknown server-side error occurred while processing the command. Further Details: run errorDetails method

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I tried with other specifications of the options' combination, but nothing worked. It really seems that the combination just makes Chromedriver unusable, however, I'm really new of RSelenium/Chromedriver, so maybe I'm missing something.

Thank you very much in advance!

Moreno

[John Chen]

Hi Moreno,

Thanks for reporting this issue to us.

On Windows, headless Chrome work properly only if user-data-dir uses \ instead of / as path separator. I filed an issue (https://crbug.com/859676) to track this. In the meantime, you can work around this issue by replacing / with \ in your path.

I wasn't able to repro this issue on Mac, though I don't have access to RSelenium, and used Python instead. If you can provide ChromeDriver verbose log then I can take another look.

Thanks,

John

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