HTTP Structured Field Values in Python

This is a Python 3 library implementing parsing and serialisation of HTTP Structured Fields.

The library's initial purpose is to prove the algorithms in the specification; as a result, it is not at all optimised. It tracks the specification closely, but since it is not yet an RFC, may change at any time.

The top-level parse and serialise functions are the ones your code should call.

Currently, this implements draft 19 of the specification.

Command Line Use

You can validate and examine the data model of a field value by calling the library on the command line, using -d, -l and -i to denote dictionaries, lists or items respectively; e.g.,

> python3 -m http_sfv -i "foo;bar=baz"
[
    {
        "__type": "token",
        "value": "foo"
    },
    {
        "bar": {
            "__type": "token",
            "value": "baz"
        }
    }
]

or:

> python3 -m http_sfv -i "foo;&bar=baz"
FAIL: Key does not begin with lcalpha or * at: &bar=baz

Note that if successful, the output is in the JSON format used by the test suite.