apachec websocket

Apache WebSocket是一个基于Java的开源库，用于在Web应用程序中实现WebSocket协议。它提供了一组注解（@ServerEndpoint，@OnOpen，@OnMessage，@OnClose和@OnError），以及一些类和接口，用于创建WebSocket服务器端点并处理来自客户端的消息。通过使用Apache WebSocket，开发人员可以轻松地创建具有实时双向通信功能的Web应用程序。

相关问题

Apache 允许 Websocket

是的，Apache 可以允许 Websocket。要启用 Websocket，你需要在 Apache 中启用 `mod_proxy` 和 `mod_proxy_wstunnel` 模块。

以下是在 CentOS 8 上启用 Websocket 的步骤：

1. 安装 `mod_proxy` 和 `mod_proxy_wstunnel`：

   sudo dnf install -y mod_proxy mod_proxy_wstunnel

2. 打开 Apache 配置文件 `/etc/httpd/conf/httpd.conf`，并添加以下配置：

   ProxyPass "/ws/" "ws://localhost:8080/"
   ProxyPassReverse "/ws/" "ws://localhost:8080/"

上述配置中的 `/ws/` 是你要代理的 WebSocket 路径，`localhost:8080` 是你 WebSocket 服务器的地址和端口。

3. 重新启动 Apache：

   sudo systemctl restart httpd

现在 Apache 已经启用了 WebSocket，你可以使用 WebSocket 客户端连接到 `http://yourdomain.com/ws/`，并与 WebSocket 服务器通信。

c websocket client

As an AI language model, I don't have the capability of creating an actual WebSocket client. However, I can provide you with some information on how to create a WebSocket client in C.

To create a WebSocket client in C, you can use a library such as libwebsockets. Here are the general steps to create a WebSocket client using libwebsockets:

1. Install libwebsockets: You can download and install libwebsockets from their website or using package managers such as apt-get or yum.

2. Include the necessary headers: In your C code, include the necessary headers for libwebsockets:

#include <libwebsockets.h>

3. Create a WebSocket client context: Create a context for the WebSocket client using the `lws_create_context` function:

struct lws_context *context = lws_create_context(context_creation_info);

Here, `context_creation_info` is a structure that contains the necessary information for creating the context, such as the protocol, port number, and SSL options.

4. Connect to the WebSocket server: Use the `lws_client_connect` function to connect to the WebSocket server:

struct lws_client_connect_info connect_info = {0};
connect_info.context = context;
connect_info.address = "ws://example.com";
connect_info.port = 80;
connect_info.path = "/";
connect_info.host = "example.com";
connect_info.origin = "http://example.com";
connect_info.protocol = "my-protocol";
connect_info.userdata = my_user_data;
lws_client_connect(&connect_info);

Here, `connect_info` is a structure that contains the necessary information for connecting to the server, such as the server address, port number, path, and protocol. `my_user_data` is a pointer to any user-defined data that you want to pass to the WebSocket client.

5. Handle events: Use the `lws_service` function to handle events for the WebSocket client:

while (1) {
    lws_service(context, 10);
}

Here, `context` is the WebSocket client context, and `10` is the timeout in milliseconds for handling events.

6. Send and receive messages: Use the `lws_write` function to send messages to the server, and use the `LWS_CALLBACK_CLIENT_RECEIVE` callback to receive messages from the server:

int callback(struct lws *wsi, enum lws_callback_reasons reason, void *user_data, void *in, size_t len) {
    switch (reason) {
        case LWS_CALLBACK_CLIENT_RECEIVE:
            // handle received message
            break;
    }
    return 0;
}

lws_callback_functions callbacks = {0};
callbacks.client_receive = callback;
lws_callback_on_writable(wsi);
lws_write(wsi, message, message_len, LWS_WRITE_TEXT);

Here, `wsi` is the WebSocket client instance, `callback` is a user-defined callback function for handling events, `message` is the message to send, and `message_len` is the length of the message.

These are the general steps for creating a WebSocket client in C using libwebsockets. However, there are many other WebSocket libraries available for C, and the specific steps may vary depending on the library you choose.