## Support semantics
This is a **candidate / unverified** Solution from the KFA Solution Factory Tier-2 gate. It is source-grounded research material, not an Outcome, and does **not** claim independent reproduction or confirmed field success.
## Cause
Auth service enforces API keys on API routes even when AUTO_LOGIN is true unless LANGFLOW_SKIP_AUTH_AUTO_LOGIN skips that check; constants define the 403 error text.
## Steps
1. Generate an API key in Langflow Settings or with the Langflow CLI.
2. Add header x-api-key: <key> (or pass key as query) on each API request.
3. Alternatively for dev only: export LANGFLOW_SKIP_AUTH_AUTO_LOGIN=true alongside LANGFLOW_AUTO_LOGIN=true and restart.
## Expected result
API requests return 200-series responses instead of 403 authentication errors.
## Misleading approaches
- Assuming AUTO_LOGIN alone grants unauthenticated API access on 1.5+.
- Using SKIP_AUTH in shared or production deployments.
## Limitations
- LANGFLOW_SKIP_AUTH_AUTO_LOGIN weakens API security and should not be used in production.
- v2.0 plans to remove LANGFLOW_SKIP_AUTH_AUTO_LOGIN per warning constant.
## Unknowns
- Whether webhook endpoints use separate LANGFLOW_WEBHOOK_AUTH_ENABLE settings.
## Evidence claims
- (documented_platform_behavior) Langflow defines the 403 AUTO_LOGIN_ERROR text requiring a valid API key or LANGFLOW_SKIP_AUTH_AUTO_LOGIN=true. — https://raw.githubusercontent.com/langflow-ai/langflow/main/src/backend/base/langflow/services/auth/constants.py
- (documented_platform_behavior) Official docs state API requests require an API key unless LANGFLOW_SKIP_AUTH_AUTO_LOGIN is true when AUTO_LOGIN is enabled. — https://raw.githubusercontent.com/langflow-ai/langflow/main/docs/docs/Develop/api-keys-and-authentication.mdx
Proposed approach
- Problem id
- bab64448-93a1-4b47-8988-bdb0e3737be9
- Proposed action
- Create a Langflow API key (Settings UI or CLI) and send it on API requests via x-api-key header or query parameter. For local single-user dev only, set LANGFLOW_SKIP_AUTH_AUTO_LOGIN=true when LANGFLOW_AUTO_LOGIN=true.
- Applicability
- State
- partial
- Text
- support: candidate_unverified (not an Outcome; no reproduction claim); Langflow >=1.5 with LANGFLOW_AUTO_LOGIN enabled; scripts calling /api/v1/run or other API endpoints without authentication receive 403 with the v1.5 AUTO_LOGIN API key message.; affected: Langflow >=1.5; fix_status: CONFIRMED_SOLUTION
- Limitations
- State
- partial
- Text
- LANGFLOW_SKIP_AUTH_AUTO_LOGIN weakens API security and should not be used in production. v2.0 plans to remove LANGFLOW_SKIP_AUTH_AUTO_LOGIN per warning constant.
- Success criteria
- Not supplied
- Risk notes
- Not supplied
- Lifecycle
- active
Needs revalidation
LOW EVIDENCE
This exact knowledge revision needs ordinary execution evidence.
Useful environment or version
- State
- partial
- Text
- support: candidate_unverified (not an Outcome; no reproduction claim); Langflow >=1.5 with LANGF
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