http-sf
Parse and serialise HTTP Structured Fields
Decision gist · record as of 2026-08-14
Yes. The package has low install friction, active maintenance, no known vulnerabilities, and a permissive MIT license. It fills a clear need for RFC 9651 compliance in Python HTTP tooling. The functional API is straightforward, error handling is detailed, and a compatibility layer eases migration. Suitable for production use in HTTP-related projects.AI-flagged interpretation of the facts on this page — verify before relying
Before you install
- Requires Python 3.10 or later.
- Low friction: pure Python wheel with a single runtime dependency (typing_extensions).
- Actively maintained with recent release activity.
License · maintenance · safety
MIT (permissive) — MIT license permits unrestricted use, modification, and distribution in both open-source and proprietary projects with minimal obligations.
last release 2026-05-25 (81 days) · last repo commit 2026-08-03 · 10 stars
0 known vulnerabilities (OSV.dev, 2026-08-14) · 189,741 downloads/mo, #9,924 on PyPI
Alternatives
Verify before relying
pip install http-sf
from http_sf import parse, ser
result = parse(b"foo; a=1, bar; b=2", tltype="dictionary")
output = ser(result)- Whether the library handles all edge cases in RFC 9651 or if certain field types remain unimplemented
- Performance characteristics when parsing very large or deeply nested structured fields
- Compatibility guarantees for the compat layer with all legacy use patterns
What it is and what it does
http-sf is a Python library that implements RFC 9651 for parsing and serializing HTTP Structured Fields. It converts HTTP header values (provided as bytes) into Python data structures—dictionaries, lists, and items—and back again. The library handles the full range of structured field types: integers, decimals, strings, tokens, byte sequences, booleans, dates, and display strings, along with parameters attached to any of these types.
The package provides a functional API via `parse()` and `ser()` functions, with detailed error reporting through `StructuredFieldError` exceptions that include position and context information. It also includes a compatibility layer and a command-line tool for validating and inspecting field values. Requires Python 3.10 or later.
Use it for
- Parse HTTP Cache-Control, Accept, or other structured headers in web servers or HTTP clients
- Validate and debug HTTP header values from the command line using the built-in CLI
- Migrate existing code from deprecated libraries without rewriting imports via the compat layer
- Build HTTP middleware or proxies that need to inspect and manipulate structured field values
- Implement RFC 9651 compliance in custom HTTP protocol handlers
Worth the install?
AI-flagged interpretation of the facts on this page. Verify before relying on it.
Yes.
The package has low install friction, active maintenance, no known vulnerabilities, and a permissive MIT license. It fills a clear need for RFC 9651 compliance in Python HTTP tooling. The functional API is straightforward, error handling is detailed, and a compatibility layer eases migration. Suitable for production use in HTTP-related projects.
Install
http-sf on PyPI
Before you install
Low friction: pure Python wheel with a single runtime dependency (typing_extensions). Actively maintained with recent release activity.
Requires Python 3.10 or later.
License in practice
MIT license permits unrestricted use, modification, and distribution in both open-source and proprietary projects with minimal obligations.
Quickstart
pip install http-sf
from http_sf import parse, ser
result = parse(b"foo; a=1, bar; b=2", tltype="dictionary")
output = ser(result)Verify before relying
- Whether the library handles all edge cases in RFC 9651 or if certain field types remain unimplemented
- Performance characteristics when parsing very large or deeply nested structured fields
- Compatibility guarantees for the compat layer with all legacy use patterns
Package facts
| License | MIT permissive |
| Python support | Supports the current Python release >=3.10 |
| Install friction | Low. Pure-Python wheel |
| Runtime dependencies | 1 packagetyping_extensions |
| Maintenance | Actively maintained 81 days since the last release |
| Last repo commit | |
| First released | |
| Downloads | 189,741 / month, #9,924 on PyPI 30-day window, as of 2026-08-14 |
| Known vulnerabilities | None known OSV.dev, checked 2026-08-14 |
| Classifiers | Development Status :: 4 - BetaOperating System :: OS Independent |
Evidence: http_sf-1.3.0-py3-none-any.whl
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