HttpContext.Session is empty after an application is published to a Service Fabric cluster

Question

The application uses OAuth2 flowO365 to log into user accounts and to store the returned access tokens in a session variable. The following code is used to store tokens:

var authResult = await authContext.AcquireTokenByAuthorizationCodeAsync(
    Request.Query["code"],                                         
    loginRedirectUri,                                               
    new ClientCredential(ConfigSettings.ClientId, ConfigSettings.ClientSecret), 
    ConfigSettings.O365UnifiedAPIResource);

var authResultEWS = await authContext.AcquireTokenByAuthorizationCodeAsync(
    Request.Query["code"],                                         
    loginRedirectUri,                                               
    new ClientCredential(ConfigSettings.ClientId, ConfigSettings.ClientSecret), 
    ConfigSettings.EWSAPIResource);

HttpContext.Session.SetString(SessionKeys.Login.AccessToken, authResult.AccessToken);
HttpContext.Session.SetString(SessionKeys.Login.EWSAccessToken, authResultEWS.AccessToken);

And here is how we get tokens in our controllers again:

private string GetSessionValue(string key)
{
    byte[] buffer = new byte[2048];
    HttpContext.Session.TryGetValue(key, out buffer);
    return System.Text.Encoding.UTF8.GetString(buffer);
}

This soluton runs on a local cluster of 5 nodes, but after publishing to the Azure 3 node cluster Session, it does not seem to work.

I used remote debugging and access tokens are correctly added, but as soon as I call GetSessionValueit HttpContext.Sessioncontains 0.

To use HttpContext.Sessionis a bad idea for distributed architectures such as SF, what would be a good replacement solution?

Answer 1

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