How can I get my webapp's base URL in ASP.NET MVC?

Question

How can I quickly determine what the root URL is for my ASP.NET MVC application? I.e., 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.

score 437 · Accepted Answer · edited Dec 20 '13 at 12:50

437

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

edited Dec 20 '13 at 12:50

Suhas

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answered Aug 17 '09 at 14:48

tghw

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I tried this, but neither HttpContext.Current.Request.Authority, nor HttpContext.Current.Request.Scheme was defined. – Adrian Grigore Aug 18 '09 at 17:45
8

What is `urlHelper.Content("~")`? How do I create define `urlHelper`? Thanks! – Maxim Zaslavsky Aug 15 '10 at 07:38
31

@Maxim, you can problably substitute **Url.Content("~")** – UpTheCreek Nov 24 '10 at 15:14
2

var urlHelper = new UrlHelper(html.ViewContext.RequestContext); – David Sep 02 '11 at 16:05
14

What I ended up using: `var request = HttpContext.Current.Request; urlBase = string.Format("{0}://{1}{2}", request.Url.Scheme, request.Url.Authority, (new System.Web.Mvc.UrlHelper(request.RequestContext)).Content("~"));` – Peter Nov 28 '11 at 10:21
7

For MVC 4 I use `ControllerContext.RequestContext.HttpContext.Request` – row1 Oct 12 '12 at 02:10
4

What happens when you are behind a load balancer and the server is really taking requests at http://10.55.44.33:1234 when the public url is https://www.example.com ? – Wyatt Barnett Mar 10 '14 at 22:38
1

@WyattBarnett: You put the public URL root in a config file. There is no zero-config solution for that case (except constructing the URLs with JS on the client side - but that would work only for simple links and would not degrade gracefully). – Ishmaeel May 06 '14 at 13:38
@WyattBarnett: Ah, I didn't realize you were the owner of _that_ answer (which I had upvoted) and thought you were asking here genuinely. – Ishmaeel May 08 '14 at 08:09
7

`@Url.Content("~")` resolves to `"/"`, which isn't the base url. – Andrew Hoffman Mar 31 '15 at 20:44
1

@WyattBarnett I guess it should really be doing something like getting the host from Request.Headers["x-forwarded-host"] – Paul Zahra Apr 21 '16 at 10:15
@PaulZahra sure if that is how your proxy is configured -- you don't have to pass that through at all, and x-* headers are all non-standard to boot. – Wyatt Barnett Apr 27 '16 at 16:17
returns invalid url for cases where you are behind ngrok tunnel and https – Mohammad Zekrallah May 18 '20 at 19:58

Serj Sagan · Answer 2 · 2017-03-17T00:07:08.900

139

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}";
}

edited Mar 17 '17 at 00:07

answered Aug 27 '12 at 14:47

Serj Sagan

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Where did you put this method? – Josh Dean May 28 '13 at 00:05
3

That really depends on how often you need to use it... if this is a single use deal then just put it in the class where you need this data, if you anticipate using it in multiple classes in your app, then I use a folder called `Helpers` in the base of my app, I have a `static` class called `Statics` and I put functions like the above there... just make sure you change the above from `public string GetBaseUrl()` to `public static string GetBaseUrl()` – Serj Sagan May 28 '13 at 17:02
As an update, I no longer use a class called `Statics`, instead I have it broken apart into more specific uses, so in this case this would go into my `UrlHelper` class – Serj Sagan Aug 14 '16 at 22:29
`Host.ToUriComponent()`, finally, and I was able to get request object with `Url.ActionContext.HttpContext` in view – mkb Mar 10 '18 at 21:26
In the `view` you just need to use `@Context`to get at the `HttpContext`... please don't use `Url.ActionContext.HttpContext`... – Serj Sagan May 28 '19 at 22:54
2

Of all the options that I have found, this is the only one that actually worked for me. Your #2 that is. Thanks a bunch! – adeldegan Nov 12 '19 at 16:40
4

Upvoted this because it's the only one to mention PathBase, which is exactly what I needed. Thanks! – Dave Nov 27 '19 at 11:48
Good answer, misses the `port` part though. – Alex from Jitbit Sep 12 '22 at 20:06

score 76 · Answer 3 · answered May 03 '12 at 15:32

76

In Code:

Url.Content("~/");

MVC3 Razor Syntax:

@Url.Content("~/")

answered May 03 '12 at 15:32

mxasim

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This is fine for using on the Razor pages, but if you're trying to pass the URL to an external source, it won't give you the full URL. – krillgar Apr 03 '14 at 14:03
7

It doesn't work. It'll just add `/` instead of actual name. – Mrchief Apr 21 '16 at 02:15
2

Where is Code does the `Url` helper available to you right off the bat? Maybe only in the `Controller`. Certainly not in the `ViewModel` or any other `class` where you may need this.. – Serj Sagan Aug 12 '16 at 23:31

Bronek · Answer 4 · 2016-07-26T20:35:32.580

46

Maybe it is extension or modification of the answers posted here but I use simply the following line and it works:

Request.Url.GetLeftPart(UriPartial.Authority) + Url.Content("~")

When my path is: http://host/iis_foldername/controller/action
then I receive : http://host/iis_foldername/

edited Jul 26 '16 at 20:35

answered May 15 '13 at 10:52

Bronek

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score 27 · Answer 5 · edited Dec 21 '14 at 06:02

27

The following snippet works nicely for me in MVC4, and doesn't need an HttpContext available:

System.Web.HttpRuntime.AppDomainAppVirtualPath

edited Dec 21 '14 at 06:02

p.campbell

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answered Aug 09 '12 at 14:47

user666142

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Seems to work in MVC3 too. I use it in `jQuery.load()` to construct the URL for the controller and action I want to call: `$('#myplaceholder').load('@(Html.Raw(HttpRuntime.AppDomainAppVirtualPath))/MyController/MyAction', ...);` – Kjell Rilbe Oct 19 '12 at 09:17
why would you do that? instead of calling Url.Action? – BlackTigerX Jul 10 '14 at 22:05
4

Doesn't work when deployed to Azure. Higher rated answers work in this scenario. – Jeff Dunlop May 18 '15 at 08:51

score 25 · Answer 6 · answered Aug 17 '09 at 15:17

25

The trick with relying upon IIS is that IIS bindings can be different from your public URLs (WCF I'm looking at you), especially with multi-homed production machines. I tend to vector toward using configuration to explicitly define the "base" url for external purposes as that tends to be a bit more successful than extracting it from the Request object.

answered Aug 17 '09 at 15:17

Wyatt Barnett

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2

Also true for servers behind load balancers or proxies. – Ishmaeel May 06 '14 at 13:45

score 21 · Answer 7 · answered Dec 29 '13 at 20:22

21

For an absolute base URL use this. Works with both HTTP and HTTPS.

new Uri(Request.Url, Url.Content("~"))

answered Dec 29 '13 at 20:22

arni

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score 16 · Answer 8 · answered Sep 12 '14 at 13:22

This is a conversion of an asp.net property to MVC . It's a pretty much all singing all dancing get root url method.

Declare a helper class:

namespace MyTestProject.Helpers
{
    using System.Web;

    public static class PathHelper
    {
        public static string FullyQualifiedApplicationPath(HttpRequestBase httpRequestBase)
        {
            string appPath = string.Empty;

            if (httpRequestBase != null)
            {
                //Formatting the fully qualified website url/name
                appPath = string.Format("{0}://{1}{2}{3}",
                            httpRequestBase.Url.Scheme,
                            httpRequestBase.Url.Host,
                            httpRequestBase.Url.Port == 80 ? string.Empty : ":" + httpRequestBase.Url.Port,
                            httpRequestBase.ApplicationPath);
            }

            if (!appPath.EndsWith("/"))
            {
                appPath += "/";
            }

            return appPath;
        }
    }
}

Usage:

To use from a controller:

PathHelper.FullyQualifiedApplicationPath(ControllerContext.RequestContext.HttpContext.Request)

To use in a view:

@using MyTestProject.Helpers

PathHelper.FullyQualifiedApplicationPath(Request)

This is the only answer that accounts for the possibility of a site running on a port other than 80. All of the other answers are unsafe as far as I am concerned. Thanks! — jebar8, Jan 07 '15 at 22:25

katesky8 · Answer 9 · 2014-03-11T15:02:57.057

12

In MVC _Layout.cshtml:

<base href="@Request.GetBaseUrl()" />

Thats what we use!

public static class ExtensionMethods
{
public static string GetBaseUrl(this HttpRequestBase request)
        {
          if (request.Url == (Uri) null)
            return string.Empty;
          else
            return request.Url.Scheme + "://" + request.Url.Authority + VirtualPathUtility.ToAbsolute("~/");
        }
}

edited Mar 11 '14 at 15:02

answered Mar 10 '14 at 21:51

katesky8

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+1 for using ``. Also you can omit the Scheme such that it will work with http or https. That means you can start the url with `//`. – Jess Dec 09 '16 at 19:01

score 5 · Answer 10 · answered Jul 24 '12 at 00:06

This works fine for me (also with a load balancer):

@{
    var urlHelper = new UrlHelper(Html.ViewContext.RequestContext);
    var baseurl = urlHelper.Content(“~”);
}

<script>
    var base_url = "@baseurl";
</script>

Especially if you are using non-standard port numbers, using Request.Url.Authority appears like a good lead at first, but fails in a LB environment.

score 3 · Answer 11 · answered Aug 17 '09 at 14:05

You could have a static method that looks at HttpContext.Current and decides which URL to use (development or live server) depending on the host ID. HttpContext might even offer some easier way to do it, but this is the first option I found and it works fine.

score 3 · Answer 12 · answered Apr 14 '13 at 07:46

3

You can use the following script in view:

<script type="text/javascript">
    var BASE_URL = '<%= ResolveUrl("~/") %>';
</script>

answered Apr 14 '13 at 07:46

Andrus

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score 3 · Answer 13 · answered Oct 03 '13 at 13:35

3

For ASP.NET MVC 4 it is a bit different:

string url = HttpContext.Request.Url.AbsoluteUri;

answered Oct 03 '13 at 13:35

Fernando Vezzali

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Muhammad Ashikuzzaman · Answer 14 · 2015-09-22T08:29:28.597

3

This is working in ASP .NET MVC 4 In any controller action you can write: 1stline gets the whole url+Query String. 2nd line remove local path & query ,last '/' symbol. 3rd line add '/' symbol at last position.

Uri url = System.Web.HttpContext.Current.Request.Url;
string UrlLink = url.OriginalString.Replace(url.PathAndQuery,"");
UrlLink = String.Concat(UrlLink,"/" );

edited Sep 22 '15 at 08:29

answered Sep 08 '15 at 11:57

Muhammad Ashikuzzaman

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score 3 · Answer 15 · answered Jun 03 '16 at 08:07

3

in simple html and ASP.NET or ASP.NET MVC if you are using tag:

<a href="~/#about">About us</a>

answered Jun 03 '16 at 08:07

Ravi Anand

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score 3 · Answer 16 · edited Oct 04 '17 at 07:55

On the webpage itself:

<input type="hidden" id="basePath" value="@string.Format("{0}://{1}{2}",
  HttpContext.Current.Request.Url.Scheme,
  HttpContext.Current.Request.Url.Authority,
  Url.Content("~"))" />

In the javascript:

function getReportFormGeneratorPath() {
  var formPath = $('#reportForm').attr('action');
  var newPath = $("#basePath").val() + formPath;
  return newPath;
}

This works for my MVC project, hope it helps

score 3 · Answer 17 · answered Mar 01 '17 at 12:25

3

For url with aplication alias like http://example.com/appAlias/... You can try this:

var req = HttpContext.Current.Request;
string baseUrl = string.Format("{0}://{1}/{2}", req.Url.Scheme, req.Url.Authority, req.ApplicationPath);

answered Mar 01 '17 at 12:25

Jacek Gzel

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score 3 · Answer 18 · answered May 27 '20 at 07:55

3

This was my solution (using .net core 3.1, in an api controller):

string baseUrl = $"{Request.Scheme}://{Request.Headers.Where(h => h.Key == "Host").First().Value}";

answered May 27 '20 at 07:55

Barnebyte

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score 3 · Answer 19 · answered Sep 17 '20 at 17:03

3

In .net core 3.1 I used this approach:

$"{Request.Scheme}://{Request.Host}{Url.Content("~/")}"

answered Sep 17 '20 at 17:03

Krzysztof Madej

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score 2 · Answer 20 · answered Feb 14 '14 at 13:54

2

For MVC 4:

String.Format("{0}://{1}{2}", Url.Request.RequestUri.Scheme, Url.Request.RequestUri.Authority, ControllerContext.Configuration.VirtualPathRoot);

answered Feb 14 '14 at 13:54

Remigijus Pankevičius

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score 2 · Answer 21 · edited Mar 08 '19 at 20:14

2

Maybe it is a better solution.

@{
   var baseUrl = @Request.Host("/");
}

using

<a href="@baseUrl" class="link">Base URL</a>

edited Mar 08 '19 at 20:14

Cyril Durand

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answered Mar 31 '15 at 02:17

ms_devel

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1

I did not test, but I doubt this will work when the base url is a virtual directly. ie. localhost/myApp – emragins Dec 16 '15 at 04:46

score 2 · Answer 22 · answered May 01 '17 at 23:01

2

I put this in the head of my _Layout.cshtml

 <base href="~/" />

answered May 01 '17 at 23:01

cineam mispelt

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score 2 · Answer 23 · answered Dec 02 '19 at 06:34

2

@{
    var baseurl = Request.Url.Scheme + "://" + Request.Url.Host + ":" + Request.Url.Port + Url.Content("~");
}
@baseurl

--output http://localhost:49626/TEST/

answered Dec 02 '19 at 06:34

Jackdon Wang

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score 1 · Answer 24 · answered Apr 28 '19 at 16:44

The following worked solidly for me

var request = HttpContext.Request;
                        var appUrl = System.Web.HttpRuntime.AppDomainAppVirtualPath;

                        if (appUrl != "/")
                            appUrl = "/" + appUrl + "/";

                        var newUrl = string.Format("{0}://{1}{2}{3}/{4}", request.Url.Scheme, request.UrlReferrer.Host, appUrl, "Controller", "Action");

score 1 · Answer 25 · answered Jun 15 '19 at 17:49

1

Simply in one line get BaseUrl

string baseUrl = new Uri(Request.Url, Url.Content("~")).AbsoluteUri;

//output example: https://stackoverflow.com

answered Jun 15 '19 at 17:49

Zahid Tanveer

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I'm not getting `Request.Url` and `Url.Content()`. What do I need to import to get them? – priyamtheone Mar 02 '23 at 14:22

score 1 · Answer 26 · answered Sep 21 '19 at 14:57

Also you can use this. For the razor pages, it is better to use it than the others.

https://ml-software.ch/posts/getting-the-base-url-for-an-asp-net-core-mvc-web-application-in-your-static-javascript-files

<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8" />
    <base href='@Url.AbsoluteContent("~/")'>
    <title>@ViewBag.Title - ASP.NET Core Web Application</title>
    <!-- ... -->
</head>
<body>

score 1 · Answer 27 · answered Apr 03 '20 at 15:44

add this function in static class in project like utility class:

utility.cs content:

public static class Utility
{
    public static string GetBaseUrl()
    {
        var request = HttpContext.Current.Request;
        var urlHelper = new UrlHelper(request.RequestContext);
        var baseUrl = $"{request.Url.Scheme}://{request.Url.Authority}{urlHelper.Content("~")}";
        return baseUrl;
    }
}

use this code any where and enjoy it:

var baseUrl = Utility.GetBaseUrl();

How can I get my webapp's base URL in ASP.NET MVC?

27 Answers27

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