c++ - 如何防止 libwebsockets 客户端超时

Question

我正在尝试使用 libwebsockets 创建一个 C++ websocket 客户端，但由于超时，我无法建立连接。我已经剥离了测试的内容，这是我用来建立连接的内容:

协议(protocol)

static int defaultCallback(
    struct  libwebsocket_context* context,
    struct  libwebsocket* wsi,
    enum    libwebsocket_callback_reasons reason,
    void*   user,
    void*   in,
    size_t  len)
{
    return 0;
}

static struct libwebsocket_protocols protocols[] =  {
    { "default", defaultCallback, 0 },
    { NULL, NULL, 0 }
};

创建上下文

    struct lws_context_creation_info info;
    memset(&info, 0, sizeof(info));
    info.port = CONTEXT_PORT_NO_LISTEN;
#ifndef LWS_NO_EXTENSIONS
    info.extensions = libwebsocket_get_internal_extensions();
#endif
    info.gid = -1;
    info.uid = -1;
    info.protocols = protocols;

    _context = libwebsocket_create_context(&info);

创建客户端

注意:地址“ws://localhost”我也试过“ws://echo.websocket.org”。本地主机服务器是一个 Node & ws 应用程序，我已经用 Chrome 测试过并且运行良好。

_websocket = libwebsocket_client_connect(_context, // context
                                         _address.c_str(), // address
                                         _port, // port
                                         0, // use ssl?
                                         "/", // path
                                         _address.c_str(), // host
                                         NULL, // origin
                                         NULL,  // protocol
                                         -1);   // version

服务上下文

while(1) {
    libwebsocket_service(_context, 50);
}

输出当我运行上面的代码时，这是我通过 libwebsockets 日志回调获得的输出:

NOTICE: Initial logging level 1023
NOTICE: Library version: 1.4 3ae1bad
NOTICE: IPV6 not compiled in
NOTICE: libev support not compiled in
INFO:  LWS_MAX_HEADER_LEN: 1024
INFO:  LWS_MAX_PROTOCOLS: 5
INFO:  SPEC_LATEST_SUPPORTED: 13
INFO:  AWAITING_TIMEOUT: 5
INFO:  SYSTEM_RANDOM_FILEPATH: '/dev/urandom'
INFO:  LWS_MAX_ZLIB_CONN_BUFFER: 65536
NOTICE:  static allocation: 4536 + (16 x 10240 fds) = 168376 bytes
INFO:  LWS_MAX_EXTENSIONS_ACTIVE: 3
NOTICE:  canonical_hostname = an-iMac
NOTICE:  per-conn mem: 248 + 2140 headers + protocol rx buf
PARSER:   Protocol: default
CLIENT: libwebsocket_client_connect: direct conn
CLIENT: libwebsocket_client_connect_2
CLIENT: libwebsocket_client_connect_2: address ws://localhost
INFO: insert_wsi_socket_into_fds: wsi=0x7ff808514c70, sock=8, fds pos=1
CLIENT: nonblocking connect retry
INFO: TIMEDOUT WAITING on 2
DEBUG: close: just_kill_connection
INFO: remove_wsi_socket_from_fds: wsi=0x7ff808514c70, sock=8, fds pos=1
DEBUG: Connection closed before server reply

我查看了所有我能得到的 libwebsockets 示例/文档，但无法获得有关如何解决此问题的任何信息。任何帮助将不胜感激，并阻止我把头放在显示器上。

Answer 1

尝试不带“ws://”的地址。只是简单的“localhost”或“127.0.0.1”。