InfluxDB 2.x: Error: Bad Request (Grafana and InfluxQL)

If you configure Grafana with the InfluxDB datasource to query data from a InfluxDB 2.x with query language InfluxQL like the influx-docs[1] describes it, then you will end up in an error.

My environment
- Grafana v7.3.3
- InfluxDB v2.0.2 (OSS)

Error

If you want to add an InfluxDB 2.x datasource with InfluxQL as a Grafana datasource: InfluxDB Error: Bad Request

Cause

The authentication "Basic auth" in the InfluxDB datasource has an error/bug.

Solution

• Uncheck "Basic auth" in the Grafana InfluxDB datasource
• Add Custom HTTP Headers in the following format (Important: the Value-field must contain "Token" AND your Token):
  • Header: Authorization
  • Value: Token <YOUR_TOKEN>