Loki with S3 behind web proxy

Using default Helm Chart, with minor changes on the storage config
The loki is behind web proxy.
With or without https_proxy/http_proxy env var setting, I am getting the same error

Does loki use the env http proxy variable to reach out?

ie:

  schemaConfig:
    configs:
    - from: 2020-09-07
      store: boltdb-shipper
      object_store: s3
      schema: v11
      index:
        prefix: loki_index_
        period: 24h

  storage_config:
    boltdb_shipper:
      active_index_directory: /var/loki/index
      cache_location: /var/loki/cache
      cache_ttl: 168h         # Can be increased for faster performance over longer query periods, uses more disk space
      shared_store: s3
    aws:
      s3: s3://<ID>:<Secret>@<region>/<bucket>

Got this error:

level=error ts=2022-04-06T15:20:46.477299448Z caller=log.go:106 msg="error running loki" err="at least one bucket name must be specified\ngithub.com/grafana/loki/pkg/storage/chunk/aws.buildS3Config\n\t/src/loki/pkg/storage/chunk/aws/s3_storage_client.go:329\ngithub.com/grafana/loki/pkg/storage/chunk/aws.NewS3ObjectClient\n\t/src/loki/pkg/storage/chunk/aws/s3_storage_client.go:170\ngithub.com/grafana/loki/pkg/storage/chunk/storage.NewChunkClient\n\t/src/loki/pkg/storage/chunk/storage/factory.go:274\ngithub.com/grafana/loki/pkg/storage/chunk/storage.NewStore\n\t/src/loki/pkg/storage/chunk/storage/factory.go:213\ngithub.com/grafana/loki/pkg/loki.(*Loki).initStore\n\t/src/loki/pkg/loki/modules.go:370\ngithub.com/grafana/dskit/modules.(*Manager).initModule\n\t/src/loki/vendor/github.com/grafana/dskit/modules/modules.go:106\ngithub.com/grafana/dskit/modules.(*Manager).InitModuleServices\n\t/src/loki/vendor/github.com/grafana/dskit/modules/modules.go:78\ngithub.com/grafana/loki/pkg/loki.(*Loki).Run\n\t/src/loki/pkg/loki/loki.go:322\nmain.main\n\t/src/loki/cmd/loki/main.go:96\nruntime.main\n\t/usr/local/go/src/runtime/proc.go:255\nruntime.goexit\n\t/usr/local/go/src/runtime/asm_amd64.s:1581\nfailed to build s3 config\ngithub.com/grafana/loki/pkg/storage/chunk/aws.NewS3ObjectClient\n\t/src/loki/pkg/storage/chunk/aws/s3_storage_client.go:172\ngithub.com/grafana/loki/pkg/storage/chunk/storage.NewChunkClient\n\t/src/loki/pkg/storage/chunk/storage/factory.go:274\ngithub.com/grafana/loki/pkg/storage/chunk/storage.NewStore\n\t/src/loki/pkg/storage/chunk/storage/factory.go:213\ngithub.com/grafana/loki/pkg/loki.(*Loki).initStore\n\t/src/loki/pkg/loki/modules.go:370\ngithub.com/grafana/dskit/modules.(*Manager).initModule\n\t/src/loki/vendor/github.com/grafana/dskit/modules/modules.go:106\ngithub.com/grafana/dskit/modules.(*Manager).InitModuleServices\n\t/src/loki/vendor/github.com/grafana/dskit/modules/modules.go:78\ngithub.com/grafana/loki/pkg/loki.(*Loki).Run\n\t/src/loki/pkg/loki/loki.go:322\nmain.main\n\t/src/loki/cmd/loki/main.go:96\nruntime.main\n\t/usr/local/go/src/runtime/proc.go:255\nruntime.goexit\n\t/usr/local/go/src/runtime/asm_amd64.s:1581\nerror creating object client\ngithub.com/grafana/loki/pkg/storage/chunk/storage.NewStore\n\t/src/loki/pkg/storage/chunk/storage/factory.go:215\ngithub.com/grafana/loki/pkg/loki.(*Loki).initStore\n\t/src/loki/pkg/loki/modules.go:370\ngithub.com/grafana/dskit/modules.(*Manager).initModule\n\t/src/loki/vendor/github.com/grafana/dskit/modules/modules.go:106\ngithub.com/grafana/dskit/modules.(*Manager).InitModuleServices\n\t/src/loki/vendor/github.com/grafana/dskit/modules/modules.go:78\ngithub.com/grafana/loki/pkg/loki.(*Loki).Run\n\t/src/loki/pkg/loki/loki.go:322\nmain.main\n\t/src/loki/cmd/loki/main.go:96\nruntime.main\n\t/usr/local/go/src/runtime/proc.go:255\nruntime.goexit\n\t/usr/local/go/src/runtime/asm_amd64.s:1581\nerror initialising module: store\ngithub.com/grafana/dskit/modules.(*Manager).initModule\n\t/src/loki/vendor/github.com/grafana/dskit/modules/modules.go:108\ngithub.com/grafana/dskit/modules.(*Manager).InitModuleServices\n\t/src/loki/vendor/github.com/grafana/dskit/modules/modules.go:78\ngithub.com/grafana/loki/pkg/loki.(*Loki).Run\n\t/src/loki/pkg/loki/loki.go:322\nmain.main\n\t/src/loki/cmd/loki/main.go:96\nruntime.main\n\t/usr/local/go/src/runtime/proc.go:255\nruntime.goexit\n\t/usr/local/go/src/runtime/asm_amd64.s:1581"

Found the root cause.
The error is not due to webproxy.

for Loki distributed helm chart, storage_config needs to be placed under structuredConfiig

  structuredConfig:
    storage_config:
      boltdb_shipper:
        active_index_directory: /var/loki/index
        cache_location: /var/loki/cache
        cache_ttl: 168h   
        shared_store: s3
      aws:
        bucketnames: loki
        s3: s3://ap-southeast-1