cpp-httplib：如何获取查询参数
此示例展示如何在 cpp-httplib 中获取查询参数。有关完整源代码，请参阅 cpp-httplib hello 示例：
get_query_param_cpp.cpp
svr.Get("/hi", [](const httplib::Request& req, httplib::Response& res) {
std::string id = req.get_param_value("id");
res.set_content("id=" + id, "text/plain");
});在 http://localhost:8080/hi?id=myid 访问它
它将显示
query_param_output.txt
id=myid如果没有给出此类参数，id 将为空（== ""）。
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