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I have a controller that reads the user's info from HTTP header. The header contains user info that returns from a single sign on (SiteMinder).

Here is the code that I try:
public async Task<IEnumerable<UserForDisplayDto>> GetAllUsers()
    var person = Request.Headers["HTTP_JHED_UID"];
    if (await context.Users.AnyAsync(x => x.JHED_ID == person))
        var users = await repository.GetAllUsers();
        return mapper.Map<IEnumerable<User>, IEnumerable<UserForDisplayDto>>(users);
        return null;


"HTTP_JHED_UID" is the header and on my local db, I have JHED_ID column in Users table. Basically, I am trying to compare the incoming JHED ID to local JHED ID. If it's in there, get the users, otherwise return null.

What I have is 500 server error. I can't get this working. Any help will be appreciated!

What I have tried:

I use


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