utilities.py

def parse_request(request):
    """Parse a P2P-CI style request or response into components.

    Accepts CRLF or LF line endings. Returns (method, version, parameters, headers, body_lines).
    """
    lines = request.replace("\r\n", "\n").split("\n")
    if not lines or not lines[0].strip():
        raise ValueError("Empty request line")
    request_line = lines[0].split()
    if len(request_line) < 2:
        raise ValueError("Malformed request line")
    method = request_line[0]
    version = request_line[-1]
    parameters = request_line[1:-1]
    headers = {}
    body = []

    for line in lines[1:]:
        if not line.strip():
            continue
        if ":" in line:
            key, value = line.split(":", 1)
            headers[key.strip()] = value.strip()
        else:
            body.append(line.strip())

    return method, version, parameters, headers, body