sqlmapproject/sqlmap · error · H2Error

compressed response header block exceeds configured limit

Error message

compressed response header block exceeds configured limit

What it means

Error "compressed response header block exceeds configured limit" thrown in sqlmapproject/sqlmap.

Source

Thrown at lib/request/http2.py:1158

                self._connection_error("frame interleaved inside a CONTINUATION sequence")
        elif ftype == CONTINUATION:
            self._connection_error("unexpected CONTINUATION frame")

        state = states.get(sid)
        if state is None:
            self._connection_error("header frame for an unknown stream")
        if state.complete:
            self._connection_error("header frame received after END_STREAM")

        if ftype == HEADERS:
            if state.block is not None:
                self._connection_error("new HEADERS before the prior field section completed")
            state.block = bytearray()
            state.block_end_stream = bool(flags & FLAG_END_STREAM)
        state.block.extend(_extract_header_fragment(ftype, flags, payload))
        if len(state.block) > MAX_HEADER_BLOCK_SIZE:
            self.usable = False
            raise H2Error("compressed response header block exceeds configured limit")

        if flags & FLAG_END_HEADERS:
            self._complete_header_block(state)
            return None
        return sid

    def _process_data_frame(self, flags, sid, payload, states):
        state = states.get(sid)
        if state is None:
            self._connection_error("DATA frame for an unknown stream")
        if state.headers is None:
            self._connection_error("DATA received before final response headers")
        if state.complete:
            self._connection_error("DATA received after END_STREAM")
        flow_len = len(payload)
        if flow_len > self.conn_recv_window:
            self._connection_error("peer exceeded the connection receive window")
        if flow_len > state.recv_window:

View on GitHub (pinned to 0a35b20e39)

When it happens

Trigger: Thrown at lib/request/http2.py:1158 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of sqlmapproject/sqlmap@0a35b20e39 (2026-08-26). Data as JSON: /api/errors/5dc93590ec445e26. Report an issue: GitHub.