Sahan Serasinghe • 4/2/2025

HTTP Chunked Transfer Encoding Explained with curl

This article provides a detailed technical explanation of HTTP/1.1 chunked transfer encoding, using a practical example with curl and a FastAPI streaming backend. It covers the structure of chunked data (hex sizes, CRLF, zero-length terminator), how to inspect raw chunks with curl --raw, and how FastAPI, Starlette, and Uvicorn generate chunks via ASGI. It also discusses why HTTP/2 and HTTP/3 use different framing. The content is aimed at developers interested in HTTP internals, streaming APIs, and web protocols.

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#streaming #http #fastapi