How to redirect URLs with uppercase to corresponding lower ones?

Question

User-1600963911 posted

I have added the following to RegisterRoutes(RouteCollection routes) of Global.asax.cs:

routes.LowercaseUrls = true;

It works great. For SEO purpose, I would like to redirect old URLs with uppercase letters to their corresponding lowercase ones.  For example:

/Home/Foo1/Foo2   to    /home/foo1/foo2

/Apps/Foo3             to    /apps/foo3

Is there a way to do this globally instead of dealing with each controller and action one by one?

Answer 1

User1520731567 posted

Hi zipswich,

I would like to redirect old URLs with uppercase letters to their corresponding lowercase ones. 

You could add the below code in Application_BeginRequest in Global.asax:

protected void Application_BeginRequest(object sender, EventArgs e)
{
  //You don't want to redirect on posts, or images/css/js
  bool isGet = HttpContext.Current.Request.RequestType.ToLowerInvariant().Contains("get");
  if (isGet && HttpContext.Current.Request.Url.AbsolutePath.Contains(".") == false)    
  {
     string lowercaseURL = (Request.Url.Scheme + "://" + HttpContext.Current.Request.Url.Authority + HttpContext.Current.Request.Url.AbsolutePath);
     if (Regex.IsMatch(lowercaseURL, @"[A-Z]"))
     {
      //You don't want to change casing on query strings
      lowercaseURL = lowercaseURL.ToLower() + HttpContext.Current.Request.Url.Query;

      Response.Clear();
      Response.Status = "301 Moved Permanently";
      Response.AddHeader("Location", lowercaseURL); 
      Response.End();
    }
 }
}

Best Regards.

Yuki Tao

Answer 2

User-2054057000 posted

To redirect upper case url to lower case url you enter the below code in your web.config file:

<rewrite>
  <rules>
    <rule name="LowerCaseRule">
      <match url="[A-Z]" ignoreCase="false"/>
      <conditions>
        <add input="{REQUEST_URI}" pattern="^/*" negate="true"/>
      </conditions>
      <action type="Redirect" url="{ToLower:{URL}}"/>
    </rule>
  </rules>
<rewrite>

Answer 3

User-1600963911 posted

Thank you, Yuki.  This works.

Answer 4

User-1600963911 posted

Thank you, Yogygoyi.  It looks good though I have not tried this.  Does the rule generate 301 permanent redirect?

Answer 5

User-2054057000 posted

zipswich

Does the rule generate 301 permanent redirect?

Yes 301 redirects.

Answer 6

User-1600963911 posted

Yes 301 redirects.

Great!  Thank you.