无法抑制文件下载的 Firefox 弹出窗口

Question

Firefox - 51.0.1 Selenium - 3.0.5 Ubuntu - 16.04（64 位）

这是我的代码的样子：

profile = Selenium::WebDriver::Firefox::Profile.new
profile['browser.download.dir'] = "/tmp/webdriver-downloads"
profile['browser.download.folderList'] = 2
profile['browser.helperApps.neverAsk.saveToDisk'] = "application/pdf"
profile['pdfjs.disabled'] = true

driver = Selenium::WebDriver.for :firefox, :profile => profile
driver.get "https://s3.amazonaws.com/shopsocially-misc/vfs/vfs_test_sample.csv"

请运行上面的代码，然后您会看到弹出窗口。

这是我得到的错误：

Selenium::WebDriver::Error::UnknownError: Failed to decode response from marionette
    from /var/lib/gems/2.3.0/gems/selenium-webdriver-3.0.5/lib/selenium/webdriver/remote/response.rb:69:in `assert_ok'
    from /var/lib/gems/2.3.0/gems/selenium-webdriver-3.0.5/lib/selenium/webdriver/remote/response.rb:32:in `initialize'
    from /var/lib/gems/2.3.0/gems/selenium-webdriver-3.0.5/lib/selenium/webdriver/remote/http/common.rb:85:in `new'
    from /var/lib/gems/2.3.0/gems/selenium-webdriver-3.0.5/lib/selenium/webdriver/remote/http/common.rb:85:in `create_response'
    from /var/lib/gems/2.3.0/gems/selenium-webdriver-3.0.5/lib/selenium/webdriver/remote/http/default.rb:107:in `request'
    from /var/lib/gems/2.3.0/gems/selenium-webdriver-3.0.5/lib/selenium/webdriver/remote/http/common.rb:63:in `call'
    from /var/lib/gems/2.3.0/gems/selenium-webdriver-3.0.5/lib/selenium/webdriver/remote/w3c_bridge.rb:640:in `raw_execute'
    from /var/lib/gems/2.3.0/gems/selenium-webdriver-3.0.5/lib/selenium/webdriver/remote/w3c_bridge.rb:615:in `execute'
    from /var/lib/gems/2.3.0/gems/selenium-webdriver-3.0.5/lib/selenium/webdriver/remote/w3c_bridge.rb:126:in `get'
    from /var/lib/gems/2.3.0/gems/selenium-webdriver-3.0.5/lib/selenium/webdriver/common/navigation.rb:32:in `to'
    from /var/lib/gems/2.3.0/gems/selenium-webdriver-3.0.5/lib/selenium/webdriver/common/driver.rb:132:in `get'
    from (irb):70
    from /usr/bin/irb:11:in `<main>'

就我尝试而言，我使用的新版本似乎存在问题。如果我错了，请纠正我。

Answer 1

MIME 类型正在绊倒您。在您的示例中，您将其设置为“应用程序/pdf”。我已经用 wget 下载了文件以确定 mime 类型。

wget https://s3.amazonaws.com/shopsocially-misc/vfs/vfs_test_sample.csv
  ...
  Content-Type: application/octet-stream
Length: 200 [application/octet-stream]
...

application/octet-stream的内容类型意味着服务器本身不知道这可能是什么类型的文件。由于 Selenium 明确定义了它将接受的 MIME 类型browser.helperApps.neverAsk.saveToDisk，这会导致您的失败。

此配置文件将有助于自动下载不同类型的文件，包括application/octet-stream。

wget https://s3.amazonaws.com/shopsocially-misc/vfs/vfs_test_sample.csv
  ...
  Content-Type: application/octet-stream
Length: 200 [application/octet-stream]
...