"Write With Transformer" not generating text (502 Bad Gateway)
# 🐛 Bug

## Information

Model I am using (Bert, XLNet ...): (Distil-)GPT2 on WriteWithTransformer

Language I am using the model on (English, Chinese ...): English

The problem arises when using:
* [X] the official example scripts: Write With Transformer
* [ ] my own modified scripts: (give details below)

The tasks I am working on is:
* [X] an official GLUE/SQUaD task: Not sure what the task is called but it's WWT
* [ ] my own task or dataset: (give details below)

## To reproduce

Steps to reproduce the behavior:

1. Attempt to use the autocomplete on Write With Transformer
2. Notice it appears to be loading forever
3. Open the browser console, go to the Network tab, and try again
4. Observe the "502 Bad Gateway" error

```
HTTP/1.1 502 Bad Gateway
Server: nginx/1.14.2
Date: Wed, 01 Jul 2020 12:14:42 GMT
Content-Type: text/html
Content-Length: 173
Connection: keep-alive
X-JeanClaude: True
Access-Control-Allow-Headers: Content-Type

<html>
<head><title>502 Bad Gateway</title></head>
<body bgcolor="white">
<center><h1>502 Bad Gateway</h1></center>
<hr><center>nginx/1.14.2</center>
</body>
</html>
```

## Expected behavior

The autocomplete should appear as normal.

## Environment info
You'd know that better than I do.

@LysandreJik is rebooting the Raspberry Pi right now<|||||>Joking, I mean the Hugging Face data center<|||||>It's back up!<|||||>Thanks! It does work now, but it seems slower to respond and sometimes it times out. This is to the point where it's close to unusable. Do you happen to know whether this is on my end or yours?<|||||>Yes, there seems to be an issue. I'm fixing restarting the server.<|||||>So I guess that would be why I just started getting 502 Bad Gateway again? :)
Thanks for the help btw.<|||||>Everything should be back to normal now. Thanks for letting us know!<|||||>Yep, I was using it earlier and it appears so. Glad I could help!