retry 202 ACCEPTED
retry 202 ACCEPTED

When an ArcGIS server can't generate a response
within X amount of time, it will return a 202 ACCEPTED
response with a body like

```
{
  "processingTime": "27.018 seconds",
  "status": "Processing",
  "generating": {}
}
```

and expects the client to poll it.

Raising 202 as an exception allows our retry()
decorator to poll the endpoint.

wdiv-scrapers/dc-base-scrapers