The concerts endpoint is throwing 502/Bad Gateway errors. ### Steps to reproduce Call `http://apis.is/concerts/` from postman. Get the following error: ``` <html> <head> <title>502 Bad Gateway</title> </head> <body bgcolor="white"> <center> <h1>502 Bad Gateway</h1> </center> <hr> <center>nginx/1.14.0 (Ubuntu)</center> </body> </html> ``` Other endpoints work just fine. I've been using the weather endpoint with no issues.