How can I get my webapp's base URL in ASP.NET MVC?
How can I quickly determine what the root URL is for my ASP.NET MVC application? Ie, if IIS is set to serve my application at http://example.com/foo/bar, then I'd like to be able to get that URL in a reliable way that doesn't involve getting the current URL from the request and chopping it up in some fragile way that breaks if I re-route my action.
The reason that I need the base URL is that this web application calls another one that needs the root to the caller web application for callback purposes.
Assuming you have a Request object available, you can use:
string.Format("{0}://{1}{2}", Request.Url.Scheme, Request.Url.Authority, Url.Content("~"));
If it's not available, you can get to it via the context:
var request = HttpContext.Current.Request
So none of the ones listed here worked for me, but using a few of the answers, I got something working:
public string GetBaseUrl()
{
var request = HttpContext.Current.Request;
var appUrl = HttpRuntime.AppDomainAppVirtualPath;
if (appUrl != "/")
appUrl = "/" + appUrl;
var baseUrl = string.Format("{0}://{1}{2}", request.Url.Scheme, request.Url.Authority, appUrl);
return baseUrl;
}
Update for ASP.NET Core / MVC 6:
ASP.NET Core makes this process a bit more painful, especially if you are deep in your code. You have 2 options to get at the HttpContext
1) Pass it in from your controller :
var model = new MyClass(HttpContext);
then in model :
private HttpContext currentContext;
public MyClass(HttpContext currentContext)
{
this.currentContext = currentContext;
}
2) Perhaps the cleaner way is to inject it into your class, which starts with registering the types in your Startup:
public void ConfigureServices(IServiceCollection services)
{
// Add framework services.
services.AddMvc();
services.AddTransient<MyClass, MyClass>();
services.TryAddSingleton<IHttpContextAccessor, HttpContextAccessor>();
}
then have it injected for you like this:
private HttpContext currentContext;
public MyClass(IHttpContextAccessor httpContextAccessor)
{
currentContext = httpContextAccessor.HttpContext;
}
in either case, here is the updated for .NET Core GetBaseUrl() :
public string GetBaseUrl()
{
var request = currentContext.Request;
var host = request.Host.ToUriComponent();
var pathBase = request.PathBase.ToUriComponent();
return $"{request.Scheme}://{host}{pathBase}";
}
In Code:
Url.Content("~/");
MVC3 Razor Syntax:
@Url.Content("~/")