- libevent/libuv等成熟网络库
- RFC 7230 HTTP协议标准
- 开源实现如:Mongoose、- 头部字段
- 消息体(POST请求)建议采用状态机模式解析:
```cpp
enum class ParseState {
START_LINE,绝地求生官方网站入口
HEADERS,
BODY,
COMPLETE
};HttpRequest parseRequest(ClientConnection& conn) {
ParseState state = ParseState::START_LINE;
// 状态机实现...
}
```使用epoll实现高并发:
```cpp
int epollfd = epollcreate1(0);
struct epollevent event; event.events = EPOLLIN; event.data.fd = serverfd;
epollctl(epollfd, EPOLLCTLADD, server_fd, &event);while (true) {
int n = epollwait(epollfd, events, MAX_EVENTS, -1);
for (int i = 0; i < n; i++) {
// 处理就绪的socket
}
}
```典型线程池实现:
```cpp
class ThreadPool {
public:
void start(sizet threadCount) { for (sizet i = 0; i < threadCount; ++i) {
threads.emplace_back([this] { workerThread(); });
}
}private:
void workerThread() {
while (running) {
Task task;
{
std::unique_lock lock(mutex);
condition.wait(lock, [this]{ return !tasks.empty(); });
task = std::move(tasks.front());
tasks.pop();
}
task();
}
}
};
```在C++中实现Web服务器需要理解三个核心层次:
网络通信层 :基于BSD socket API建立TCP连接 协议解析层:处理HTTP请求报文解析与响应生成 业务逻辑层:实现路由分发和资源处理典型的服务器工作流程如下 :
cpp while (serverRunning) { ClientConnection client = acceptNewConnection(); HttpRequest request = parseRequest(client); HttpResponse response = processRequest(request); sendResponse(client, response); closeConnection(client); }
使用POSIX socket API建立基础通信 :
```cpp
// 创建监听socket
int serverfd = socket(AFINET, SOCK_STREAM, 0);// 绑定端口
struct sockaddrin address; address.sinfamily = AFINET; address.sinaddr.saddr = INADDRANY;
address.sin_port = htons(8080);bind(server_fd, (struct sockaddr*)&address, sizeof(address));
```注意点
:
- 需要处理端口复用(SO_REUSEADDR)
- 建议设置非阻塞模式(fcntl)
- 注意字节序转换(htons/ntohs)HTTP请求报文示例