How to get client IP address in Azure Functions C#?

Question

I'm writing a function in C# using Azure Functions and need to get the ip address of the client that called the function, is this possible?

Answer 1

you should use these function Get the IP address of the remote host

request.Properties["MS_HttpContext"] is not available if you debug precompiled functions local request.Properties[RemoteEndpointMessageProperty.Name] is not available on azure

private string GetClientIp(HttpRequestMessage request)
{
    if (request.Properties.ContainsKey("MS_HttpContext"))
    {
        return ((HttpContextWrapper)request.Properties["MS_HttpContext"]).Request.UserHostAddress;
    }

    if (request.Properties.ContainsKey(RemoteEndpointMessageProperty.Name))
    {
        RemoteEndpointMessageProperty prop;
        prop = (RemoteEndpointMessageProperty)request.Properties[RemoteEndpointMessageProperty.Name];
        return prop.Address;
    }

    return null;
}

Update 21.08.2018: Now Azure Functions are behind a LoadBalancer --> we have to inspect Request-Headers to determine the correct Client IP

private static string GetIpFromRequestHeaders(HttpRequestMessage request)
    {
        IEnumerable<string> values;
        if (request.Headers.TryGetValues("X-Forwarded-For", out values))
        {
            return values.FirstOrDefault().Split(new char[] { ',' }).FirstOrDefault().Split(new char[] { ':' }).FirstOrDefault();
        }

        return "";
    }