Class HTTP

scapy/layers/http.py:604–748

class HTTP(Packet):
    name = "HTTP 1"
    fields_desc = []
    show_indent = 0
    clsreq = HTTPRequest
    clsresp = HTTPResponse
    hdr = b"HTTP"
    reqmethods = b"|".join(
        [
            b"OPTIONS",
            b"GET",
            b"HEAD",
            b"POST",
            b"PUT",
            b"DELETE",
            b"TRACE",
            b"CONNECT",
        ]
    )

    @classmethod
    def dispatch_hook(cls, _pkt=None, *args, **kargs):
        if _pkt and len(_pkt) >= 9:
            from scapy.contrib.http2 import _HTTP2_types, H2Frame

            # To detect a valid HTTP2, we check that the type is correct
            # that the Reserved bit is set and length makes sense.
            while _pkt:
                if len(_pkt) < 9:
                    # Invalid total length
                    return cls
                if ord(_pkt[3:4]) not in _HTTP2_types:
                    # Invalid type
                    return cls
                length = struct.unpack("!I", b"\0" + _pkt[:3])[0] + 9
                if length > len(_pkt):
                    # Invalid length
                    return cls
                sid = struct.unpack("!I", _pkt[5:9])[0]
                if sid >> 31 != 0:
                    # Invalid Reserved bit
                    return cls
                _pkt = _pkt[length:]
            return H2Frame
        return cls

    # tcp_reassemble is used by TCPSession in session.py
    @classmethod
    def tcp_reassemble(cls, data, metadata, _):
        detect_end = metadata.get("detect_end", None)
        is_unknown = metadata.get("detect_unknown", True)
        # General idea of the following is explained at
        # https://datatracker.ietf.org/doc/html/rfc2616#section-4.4
        if not detect_end or is_unknown:
            metadata["detect_unknown"] = False
            http_packet = cls(data)
            # Detect packing method
            if not isinstance(http_packet.payload, _HTTPContent):