Splunk HTTP Event Collector (HEC)
Splunk's HTTP endpoint for ingesting events, logs, and metrics directly from applications without a forwarder agent.
Score Breakdown
⚙ Agent Friendliness
🔒 Security
HEC tokens should be rotated regularly and scoped to specific source types and indexes. TLS required in production.
⚡ Reliability
Best When
Best for applications already running in Splunk environments that need direct API-based event ingestion.
Avoid When
Avoid when you don't have Splunk — use Elasticsearch/Loki or managed logging for new setups.
Use Cases
- • Stream agent logs and events to Splunk for security monitoring and alerting without a Splunk forwarder
- • Send structured JSON events from AI pipelines for search and analysis in Splunk dashboards
- • Ingest metrics with timestamps for time-series analysis in Splunk's metrics index
- • Forward application errors to Splunk SIEM for correlation with security events
- • Batch send historical events with custom timestamps for log replay and analysis
Not For
- • Teams without Splunk Enterprise or Splunk Cloud — HEC requires a running Splunk instance
- • Low-latency applications where 100ms+ HEC ingestion latency is unacceptable
- • Raw log file shipping — use Splunk Universal Forwarder for file-based ingestion
Interface
Authentication
HEC token passed as Authorization: Splunk <token> header. Tokens are configured per input in Splunk.
Pricing
HEC is a feature of Splunk — requires Splunk Enterprise or Cloud license. Splunk Cloud Dev licenses available for development.
Agent Metadata
Known Gotchas
- ⚠ HEC token must have 'Enable indexer acknowledgment' turned on to use the ack endpoint for guaranteed delivery — off by default
- ⚠ Batch events in a single request by sending multiple JSON objects as a newline-delimited stream, not an array
- ⚠ Event time field uses Unix epoch seconds (not milliseconds) — wrong timestamp format causes events to index with wrong time
- ⚠ HEC returns HTTP 200 even when the indexer queue is full if acknowledgment is disabled — monitor Splunk indexer queues separately
- ⚠ SSL certificate validation must be configured — self-signed certs on Splunk require adding CA cert or disabling verify_ssl in client
Alternatives
Full Evaluation Report
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Scores are editorial opinions as of 2026-03-06.