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Coding workflows · ASCII HTTP header boundaries
03
A concrete starting point
Format an ASCII HTTP header from a name and value. Reject invalid name characters, line breaks, controls and non-ASCII input, allowing an empty value without creating an extra header.
Define the change
Describe the input, expected output and boundaries that must stay intact.
Inspect the work
Review the proposed edits and any commands before relying on their result.
Check the outcome
Compare actual behavior with the expected result. If a check fails, investigate it before applying more changes.
ASCII HTTP header boundaries
A concrete starting point
import re
TOKEN = re.compile(r"[!#$%&'*+.^_`|~0-9A-Za-z-]+")
def header_line(name, value):
if not isinstance(name, str) or not TOKEN.fullmatch(name):
raise ValueError("header name")
if not isinstance(value, str) or any(not 32 <= ord(c) <= 126 for c in value):
raise ValueError("ASCII header value")
return name + ": " + valueThe example is a starting point for a real project, not a claim that generated code is already tested. Adjust paths, dependencies and expected behavior to match your application.