Add support for PATH_INFO server variable · dotnet/aspnetcore#6006

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area-middlewareenhancementhelp wanted

Description

Hi there,

Can you please provide support for the PATH_INFO server variable on IIS. I'm trying to migrate my legacy MVC website to the new one I've built ASP.Net Core. I'm trying to migrate the URL rewrite rules but they don't work as they rely on the PATH_INFO server variable.

I get the following error when trying to run my application: Unrecognized parameter type: 'PATH_INFO', terminated at string index: '10' Microsoft.AspNetCore.Rewrite.Internal.IISUrlRewrite.ServerVariables.FindServerVariable(string serverVariable, ParserContext context, UriMatchPart uriMatchPart)

Extract from my configure method in startup.cs which reads in an xml file:

using (StreamReader iisUrlRewriteStreamReader =
    File.OpenText("IISUrlRewrite.xml"))
            {
                var options = new RewriteOptions()
                    .AddIISUrlRewrite(iisUrlRewriteStreamReader);

                app.UseRewriter(options);
            }

The example content of the IISUrlRewrite,xml file is:

<rewrite>
  <rules>
    <rule name="Redirect /foo to foo2" stopProcessing="true">
      <match url=".*" />
      <conditions>
        <add input="{PATH_INFO}" pattern="^/foo$" />
      </conditions>
      <action type="Redirect" url="http://www.foo2.co.uk" appendQueryString="false" />
    </rule>
  </rules>
</rewrite>

If I change {PATH_INFO} to {QUERY_STRING}, the application loads but this isn't the redirect I need. Can you please provide support for this ASAP please?

In the meantime, is there a workaround I can use that will support {PATH_INFO} patterns on IIS?

Thanks

Contributor guide

Tech stack: csharp
Domain: backend
Issue type: feature
Difficulty: 3
Estimated time: 1-2 days
Activity status: stale
Clarity: clear
Prerequisites: Familiarity with ASP.NET Core middlewareUnderstanding of IIS URL Rewrite rulesC# knowledge
Newbie friendliness: 45
Research direction: The issue requests adding support for the PATH INFO server variable in the IIS URL Rewrite middleware. Currently, the middleware throws an unrecognized parameter error. The fix likely involves adding PATH INFO to the list of supported server variables in the `IISUrlRewrite.ServerVariables` class. Look at the existing implementation in the repository under `src/Middleware/Rewrite/src/IISUrlRewrite/ServerVariables.cs` and follow the pattern used for other variables like QUERY STRING. Additionally, consider if PATH INFO behaves differently and requires special parsing.