Serverless deploy to LocalStack fails: “Invalid character in header content [authorization]” #273
Description
Running serverless deploy --stage local against LocalStack aborts during the “Resolving AWS account ID” step with the error:
Unable to find function cleanup on plugin Esbuild Deploying "sls" to stage "local" (us-east-1) Using serverless-localstack Using serverless-localstack serverless-localstack: Reconfigured endpoints Error: Failed to resolve AWS account ID: Invalid character in header content ["authorization"]deployment never reaches packaging or CloudFormation synthesis
serverless.ts
plugins: ['serverless-iam-roles-per-function', 'serverless-localstack'], custom: localstack: stages: ['local'] edgePort: 4566 host: 'http://localhost' provider: name: aws runtime: nodejs22.x environment: AWS_ENDPOINT_URL: 'http://localhost:4566' AWS_ACCESS_KEY_ID: '000000000001' AWS_ACCOUNT_ID: '000000000001'docker-compose.yml
s3mock: image: adobe/s3mock:latest environment: - retainFilesOnExit=true - root=root ports: - 9090:9090 volumes: - ./uploadedFiles:/root localstack: container_name: localstack image: localstack/localstack ports: - 4566:4566 - 4510-4559:4510-4559 environment: - DEBUG=${DEBUG:-0} - SERVICES=lambda,sqs,sns volumes: - '${LOCALSTACK_VOLUME_DIR:-./volume}:/var/lib/localstack' - '/var/run/docker.sock:/var/run/docker.sock'Versions
| Component | Version |
|---|---|
| Serverless Framework | 4.14.3 |
| serverless-localstack | 1.3.1 |
| LocalStack Docker image | localstack/localstack:latest (pulled 2025-05-14) |
| Node.js | 22.0.0 |