FMP's bulk CSV downloads now include Last-Modified and ETag response headers. Released on August 19, 2026, the update gives developers metadata for identifying whether a file has changed since a previous download. It supports workflows that need to check for updates and avoid repeatedly downloading unchanged data.
Two Headers for Identifying File Changes
The headers provide complementary information about the returned file:
|
Header |
Information provided |
|
Last-Modified |
The date and time the server reports that the resource was last modified. |
|
ETag |
An identifier associated with a particular version of the resource. |
Together, a modification timestamp and a version identifier give developers useful signals for comparing successive responses. These are standard HTTP response headers, so the information is available at the response level alongside the downloaded content.
Better Visibility Into Bulk File Updates
Teams working with bulk data often need to determine whether another download would provide new information. The additional headers give their integrations a basis for recognizing file changes and making download decisions. This is particularly useful when bulk retrieval forms part of a recurring data workflow.
FMP's Company Profile Bulk API provides an entry point for users exploring bulk downloads. Developers working with these endpoints can review the response headers as part of their integration and use the metadata to track changes between file versions.
The August 19 bulk-download release note documents the addition of both headers.
