I'm using SendGrid for my Rails App on Heroku. I tested the process of signing up. I saw the email get created and sent in SendGrid. The email showed up in my gmail inbox. But when I clicked the "Activate" link in the email I get the error below. After I got the email and clicked the link I noticed that even though I only clicked it a few times a long list of "clicked" activities showed up in sendgrid. I noticed that each click seemed to generate three "clicked" activities in sendgrid. don't know if that's a clue or not.
sendgrid.net sent an invalid response. ERR_INVALID_REDIRECT