We've had a lot of these errors from only one of our DCs - running the same code as others globally.
For example:
2017/03/31 13:22:03 Error sending request to BigQuery (attempt 1 of 3): Post https://www.googleapis.com/bigquery/v2/projects/coull-delta/datasets/demand/tables/table_name/insertAll?alt=json: stream error: stream ID 1221; PROTOCOL_ERROR
It uses the Big Query Go package from google - https://godoc.org/google.golang.org/api
Anyone got any ideas? Seen this before? As I said, exactly the same code running in other places with no issue.