Posted: 27/03/2024

Upgrading From IdentityServer Version 2 To IdentityServer Version 4

I have recently needed to upgrade from IdentityServer v2 to IdentityServer v4.

This was relatively painless (upgrade via nuget), but I had these 3 issues:

1 - PublicOrigin is no longer exposed, need to add it manually:

            
              //Add in PublicOrigin as it has been removed in v4 of IdentityServer: https://github.com/IdentityServer/IdentityServer4/issues/4535     app.Use(async (ctx, next) =>     {             ctx.SetIdentityServerOrigin("YourRequiredPublicOrigin");                         await next();     });

2 - Add in ApiScopes :

            .AddInMemoryApiScopes(ApiScopes.GetApiScopes())

Everything worked, except my Postman tests. Weird!

All my C# code was fine, which confused me.

After a lot of searching, I came across this page (English version) by Gabriel Bareclos.

It said:

I changed the content-type of the request from: form-data to: x-www-form-urlencoded .

So in my postman, I changed:

            
              "mode": "formdata",                     "formdata": [

to this:

            
              "mode": "urlencoded",                     "urlencoded": [

That was it. That fixed my postman tests!

Note - I should have looked at the docs again, although it is something that might pass you by:

            POST /connect/token CONTENT-TYPE application/x-www-form-urlencoded      client_id=client1&     client_secret=secret&     grant_type=authorization_code&     code=hdh922&     redirect_uri=https://myapp.com/callback

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