Allow If-Modified-Since Requests

Perform necessary actions to ensure optimal header configuration for efficient caching and improved client-side performance .

This health check ensures optimal header configuration for efficient caching and improved client-side performance by validating the presence of the If-Modified-Since and Last-Modified headers.

Health Check Name: allow_if_modified_since

Accessed APIs

Method	Endpoint	Description
READ	/sys/internal/ui/mounts	Reads mount configuration for secrets engines.

Configuration Parameters

Parameter	Default	Description
None	N/A	No configurable parameters.

Health Check Results

Condition	Status
Both headers (If-Modified-Since and Last-Modified) configured	OK / Informational
Only one header configured	Warning
Neither header configured	Informational

This check validates if:

• If-Modified-Since is included in passthrough_request_headers

• Last-Modified is included in allowed_response_headers

Recommended Actions

To resolve warnings or improve configuration, update your secrets engine mount settings using the following:

Note: Replace <mount> with your actual secrets engine mount path.

Standard Configuration

vhsm secrets tune \
  -passthrough-request-headers="If-Modified-Since" \
  -allowed-response-headers="Last-Modified" \
  <mount>

ACME-Specific Configuration (If you're using ACME)

vhsm secrets tune \
  -passthrough-request-headers="If-Modified-Since" \
  -allowed-response-headers="Last-Modified" \
  -allowed-response-headers="Replay-Nonce" \
  -allowed-response-headers="Link" \
  -allowed-response-headers="Location" \
  <mount>

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