sqlmapproject/sqlmap · error · H2Error

proxy closed connection during CONNECT

Error message

proxy closed connection during CONNECT

What it means

Error "proxy closed connection during CONNECT" thrown in sqlmapproject/sqlmap.

Source

Thrown at lib/request/http2.py:615

    raw = socket.create_connection((proxy_host, proxy_port), timeout=timeout)
    try:
        tunnel_host = _format_authority_host(host)
        authority = "%s:%d" % (tunnel_host, port)
        request = "CONNECT %s HTTP/1.1\r\nHost: %s\r\n" % (authority, authority)
        if proxy_cred:
            token = base64.b64encode(_as_bytes(proxy_cred)).decode("ascii")
            request += "Proxy-Authorization: Basic %s\r\n" % token
        request += "\r\n"
        raw.sendall(request.encode("latin-1"))

        # Read only through the CONNECT header terminator. A large recv() can consume
        # bytes from the tunneled TLS handshake that immediately follows the proxy
        # response, and those bytes cannot be pushed back before wrap_socket().
        response = bytearray()
        while not bytes(response).endswith(b"\r\n\r\n"):
            chunk = raw.recv(1)
            if not chunk:
                raise H2Error("proxy closed connection during CONNECT")
            response.extend(chunk)
            if len(response) > 65536:
                raise H2Error("oversized proxy CONNECT response")
        status_line = bytes(response).split(b"\r\n", 1)[0].decode("latin-1", "replace")
        fields = status_line.split(None, 2)
        code = int(fields[1]) if len(fields) >= 2 and fields[1].isdigit() else 0
        if not 200 <= code < 300:
            raise H2Error("proxy CONNECT failed: %s" % status_line)
        return raw
    except Exception:
        try:
            raw.close()
        except Exception:
            pass
        raise


def _make_ssl_context(verify, ssl_context):

View on GitHub (pinned to 0a35b20e39)

When it happens

Trigger: Thrown at lib/request/http2.py:615 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/150c98dec4432eb6. Report an issue: GitHub.