invalid_request 400 bad request - identityserver4

Question

This is my ConfigureServices method of my Identity Server project.
public void ConfigureServices(IServiceCollection services)
{
services.AddIdentityServer()
.AddDeveloperSigningCredential()
.AddOperationalStore(options =>
{
options.EnableTokenCleanup = true;
options.TokenCleanupInterval = 30; // interval in seconds
})
.AddInMemoryApiResources(Config.GetApiResources())
.AddInMemoryClients(Config.GetClients())
.AddTestUsers(Config.GetUsers())
.AddProfileService<DefaultProfileService>();
}
When I follow the tutorial, the tutorial uses .AddProfileService<ProfileService>() but I could not find ProfileService. So I use DefaultProfileService. Could the error due to this?
and in my config.cs
public class Config
{
public static IEnumerable GetApiResources()
{
return new List
{
new ApiResource("myresourceapi", "My Resource API")
{
Scopes = {new Scope("apiscope")}
}
};
}
public static IEnumerable<Client> GetClients()
{
return new[]
{
// for public api
new Client
{
ClientId = "secret_client_id",
AllowedGrantTypes = GrantTypes.ClientCredentials,
ClientSecrets =
{
new Secret("secret".Sha256())
},
AllowedScopes = { "apiscope" }
},
new Client
{
ClientId = "secret_user_client_id",
AllowedGrantTypes = GrantTypes.ResourceOwnerPassword,
ClientSecrets =
{
new Secret("secret".Sha256())
},
AllowedScopes = { "apiscope" }
}
};
}
public static List<TestUser> GetUsers()
{
return new List<TestUser>
{
new TestUser
{
SubjectId = "1",
Username = "user",
Password = "user",
Claims = new[]
{
new Claim("roleType", "CanReaddata")
}
},
new TestUser
{
SubjectId = "2",
Username = "admin",
Password = "admin",
Claims = new[]
{
new Claim("roleType", "CanUpdatedata")
}
}
};
}
}
When I test it at Postman, I got the error invalid_request
I have tested another client id ClientId = "secret_client_id" and it works.

Answer 1

If you are using AddTestUser then you don't need to add a profile service as it adds one for you that works with the test users:
public static IIdentityServerBuilder AddTestUsers(this IIdentityServerBuilder builder, List<TestUser> users)
{
builder.Services.AddSingleton(new TestUserStore(users));
builder.AddProfileService<TestUserProfileService>();
builder.AddResourceOwnerValidator<TestUserResourceOwnerPasswordValidator>();
return builder;
}

Answer 2

Found out that my problem is I issued a GET request which should be a POST request.