在C++中,使用WinHttp库可以实现通过代理服务器发送HTTP请求
#include<Windows.h>
#include <winhttp.h>
#pragma comment(lib, "winhttp.lib")
WCHAR* proxy_server = L"http=proxy.example.com:8080;https=proxy.example.com:8080";
WCHAR* proxy_bypass = L"<local>;*.example.com";
这里,proxy_server
变量定义了代理服务器的地址和端口。proxy_bypass
变量定义了不需要通过代理服务器访问的地址列表。
HINTERNET hSession = WinHttpOpen(L"MyUserAgent", WINHTTP_ACCESS_TYPE_NAMED_PROXY, proxy_server, proxy_bypass, 0);
if (!hSession) {
// 处理错误
}
HINTERNET hConnect = WinHttpConnect(hSession, L"target.example.com", INTERNET_DEFAULT_HTTPS_PORT, 0);
if (!hConnect) {
// 处理错误
}
HINTERNET hRequest = WinHttpOpenRequest(hConnect, L"GET", L"/path/to/resource", NULL, WINHTTP_NO_REFERER, WINHTTP_DEFAULT_ACCEPT_TYPES, WINHTTP_FLAG_SECURE);
if (!hRequest) {
// 处理错误
}
BOOL bResult = WinHttpSendRequest(hRequest, WINHTTP_NO_ADDITIONAL_HEADERS, 0, WINHTTP_NO_REQUEST_DATA, 0, 0, 0);
if (!bResult) {
// 处理错误
}
bResult = WinHttpReceiveResponse(hRequest, NULL);
if (!bResult) {
// 处理错误
}
DWORD dwSize = 0;
DWORD dwDownloaded = 0;
do {
dwSize = 0;
if (!WinHttpQueryDataAvailable(hRequest, &dwSize)) {
// 处理错误
}
if (dwSize == 0) {
break;
}
LPSTR pszOutBuffer = new char[dwSize + 1];
if (!pszOutBuffer) {
// 处理错误
}
ZeroMemory(pszOutBuffer, dwSize + 1);
if (!WinHttpReadData(hRequest, (LPVOID)pszOutBuffer, dwSize, &dwDownloaded)) {
// 处理错误
}
// 处理响应数据
delete[] pszOutBuffer;
} while (dwSize > 0);
WinHttpCloseHandle(hRequest);
WinHttpCloseHandle(hConnect);
WinHttpCloseHandle(hSession);
这些步骤展示了如何使用WinHttp库通过代理服务器发送HTTP请求。请根据实际需求修改代码中的服务器地址、端口和资源路径等信息。