org.openqa.selenium.WebDriverException: java.io.IOException: unexpected end of stream on Connection while invoking getCookies() with GeckoDriver

Question

I keep getting an error like this

org.openqa.selenium.WebDriverException: java.io.IOException: unexpected end of stream on Connection{localhost:13080, proxy=DIRECT hostAddress=localhost/127.0.0.1:13080 cipherSuite=none protocol=http/1.1}

when trying to read cookies from firefox. The exact same action can be performed with chrome with no problem. Port used is pretty random, anytime I start a new test I get a new port assigned as well. Should specifying another port be able to do something here? The line of code that produces it is:

driver.manage().getCookies().forEach(cookie -> System.out.println(cookie.toString()));

I wonder if it's an initialization problem with firefox and setting some value will get me past it. The initialization I do is just this:

FirefoxOptions Foptions = new FirefoxOptions();
Foptions.setBinary("/home/user/firefox/firefox");
Foptions.setCapability("marionette", true);
driver =  new FirefoxDriver(Foptions);

Answer 1

It is tough to analyze the error without the error stack trace. The error stack trace would have helped immencely to debug the issue.

However this error message...

org.openqa.selenium.WebDriverException: java.io.IOException: unexpected end of stream on Connection{localhost:13080, proxy=DIRECT hostAddress=localhost/127.0.0.1:13080 cipherSuite=none protocol=http/1.1}

...implies that the java.io.IOException was raised when you tried to invoke getCookies() .

Your main issue can be one of the following:

• Reason A : When you invoked driver.manage().getCookies() though apparently it seems the HTML DOM have loaded but still some javaScript / Ajax Calls are active setting the cookies.

• Solution : Induce WebDriverWait for an element to be clickable as follows:

   WebDriverWait(driver, 20).until(EC.element_to_be_clickable((By.CSS_SELECTOR, "input#btn_download"))).click() 

• Reason B : As per java.io.IOException: unexpected end of stream on Connection in android it may be possible that the server throwed an error and shut down as the parsing of the request was in progress.

• Solution : Cross check if you are able to access the elements within the webpage without mingling with the cookies.
• Reason C : Another reason can be the port being used by geckodriver/marionette is being used by some other application/service .
• Solution : Freeup the ports used by GeckoDriver/Marionette

Answer 2

在硒3.12.0及更高版本上使用driver.manage（）。getCookies（）方法时，我遇到了同样的问题，将硒版本降级为3.11.0，并且工作正常，此问题已在最新版本中引入。