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How to implement HTTP streaming using C++?

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Release： 2024-05-31 11:06:57

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How to implement HTTP streaming in C? Create an SSL stream socket using the Boost.Asio and asiohttps client libraries. Connect to the server and send an HTTP request. Receive HTTP response headers and print them. Receives the HTTP response body and prints it.

How to implement HTTP streaming using C++?

How to implement HTTP streaming in C

Introduction

Streaming It is a method of real-time transmission of media data through the HTTP protocol. It allows the client to receive a continuous stream of data from the server without waiting for the entire file download to complete. This article describes how to implement HTTP streaming in C using the Boost.Asio and asiohttps client libraries.

Preparation

Install Boost.Asio and asiohttps libraries.
Create a CMake project that supports SSL.

Code

The following is the code to implement HTTP streaming:

#include <boost/asio.hpp>
#include <boost/asio/ssl.hpp>

using namespace boost::asio;

int main() {
  // 设置服务器地址和端口
  std::string server_address = "example.com";
  unsigned short server_port = 443;

  // 创建 IO 服务
  io_service io_service;

  // 创建 SSL 上下文
  ssl::context ctx{ssl::context::tlsv12_client};

  // 创建 SSL 流套接字
  ssl::stream<ip::tcp::socket> stream(io_service, ctx);

  // 连接到服务器
  stream.lowest_layer().connect(ip::tcp::endpoint(ip::address::from_string(server_address), server_port));

  // 发送 HTTP 请求
  stream << "GET /stream.mp4 HTTP/1.1\r\n"
           << "Host: " << server_address << "\r\n"
           << "Connection: keep-alive\r\n"
           << "\r\n";

  // 接收 HTTP 响应头
  boost::system::error_code ec;
  std::string response_headers;
  for (;;) {
    response_headers += stream.read_some(buffer(response_headers), ec);
    if (ec || response_headers.find("\r\n\r\n") != std::string::npos) {
      break;
    }
  }
  if (ec) {
    throw std::runtime_error("Error receiving HTTP headers: " + ec.message());
  }

  // 打印响应头
  std::cout << response_headers << std::endl;

  // 接收 HTTP 响应正文
  char buffer[1024];
  size_t bytes_received = 0;
  while (bytes_received < std::numeric_limits<size_t>::max()) {
    bytes_received += stream.read_some(buffer(buffer, bytes_received), ec);
    if (ec || stream.eof()) {
      break;
    }
  }
  if (ec) {
    throw std::runtime_error("Error receiving HTTP content: " + ec.message());
  }

  // 打印响应正文
  std::cout << buffer << std::endl;

  return 0;
}

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Practical case

This program can be used to receive and play streaming media files from the server. Here is an example of playing a streaming file downloaded from example.com:

g++ -std=c++11 -I/usr/local/include -L/usr/local/lib -lasio -lasiossl stream.cpp
./a.out > stream.mp4
mplayer stream.mp4

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NOTE

Make sure the server supports HTTP streaming.
HTTP streaming requires an SSL-enabled server and client.
This sample program is for demonstration purposes only and requires more comprehensive error handling and optimization before it can be used in a production environment.

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