selenium: Content-Type header is missing

💥 Regression Report

I cannot use RemoteWebDriver in C# at all with the latest alphas. Apologies if this is a known issue, I can’t see anything so figured I’d report it. Seems like quite a fundamental issue though so maybe I’m missing something.

Last working Selenium version

Not sure what this means, the docker images go up to alpha 7, the nuget package only goes up to 5. Below are the Nuget package versions:

Worked up to version: 3.141.0

Stopped working in version: 4.0.0-alpha01-4.0.0-alpha05 (I can’t seem to get any v4 packages working, different errors on each version)

To Reproduce

Run docker compose using the file documented here: https://github.com/SeleniumHQ/docker-selenium/blob/trunk/docker-compose-v3.yml

dotnet new console -o "Example"
cd ./Example
dotnet add package Selenium.Support --version 4.0.0-alpha05 
dotnet add package Selenium.Selenium.WebDriver --version 4.0.0-alpha05 

Inside program.cs:

using System;
using OpenQA.Selenium.Chrome;
using OpenQA.Selenium.Remote;

namespace Example
{
    class Program
    {
        static void Main()
        {
            new RemoteWebDriver(new Uri("http://localhost:4444"), new ChromeOptions());
            Console.WriteLine("Done!");
        }
    }
}

The following exception is logged:

PS C:\File\Path\Example> dotnet run
Unhandled exception. OpenQA.Selenium.WebDriverException: Content-Type header is missing
   at OpenQA.Selenium.Remote.RemoteWebDriver.UnpackAndThrowOnError(Response errorResponse)
   at OpenQA.Selenium.Remote.RemoteWebDriver.Execute(String driverCommandToExecute, Dictionary`2 parameters)
   at OpenQA.Selenium.Remote.RemoteWebDriver.StartSession(ICapabilities desiredCapabilities)
   at OpenQA.Selenium.Remote.RemoteWebDriver..ctor(ICommandExecutor commandExecutor, ICapabilities desiredCapabilities)
   at OpenQA.Selenium.Remote.RemoteWebDriver..ctor(Uri remoteAddress, ICapabilities desiredCapabilities, TimeSpan commandTimeout)
   at OpenQA.Selenium.Remote.RemoteWebDriver..ctor(Uri remoteAddress, ICapabilities desiredCapab

Expected behavior

The exception should not be thrown and the driver should be useable.

Environment

Again not sure what to put here. My laptop is a windows laptop but the grid is running inside a linux container.