application/gzip

application/gzip is the media type for files compressed with gzip — the ubiquitous single-stream compressor used across Unix pipelines. Unlike ZIP, gzip compresses a single byte stream (often a .tar archive) rather than a collection of files.

Compressed logs, .tar.gz release archives, HTTP Content-Encoding for on-the-wire compression.

Do not confuse the media type application/gzip with the HTTP Content-Encoding: gzip header. The first describes the payload as a whole; the second means the payload is transparently compressed and should be decoded by the client before interpretation.

RFC 1952