What are chunk extensions? A chunk extension can be added to a data chunk in HTTP/1.1 to extend it with some metadata connected to a given chunk. But what are chunks and chunk endcoding in general? Let’s look into RFC9112: The chunked coding allows each chunk to include zero or more chunk extensions, immediately following the chunk-size, for the sake of supplying per-chunk metadata (such as a signature or hash), mid-message control information, or randomization of message body size.
