Crow：Middlewares的使用-CSDN博客
介绍了Crow中关于插件的使用，其实除了这种通用插件外，Crow还提供了为个别路由使用的局部插件。
先看例子：
//examples/example_middleware.cpp
struct SecretContentGuard : crow::ILocalMiddleware
{struct context{};void before_handle(crow::request& /*req*/, crow::response& res, context& /*ctx*/){// A request can be aborted prematurelyres.write("SECRET!");res.code = 403;res.end();}void after_handle(crow::request& /*req*/, crow::response& /*res*/, context& /*ctx*/){}
};int main()
{// ALL middleware (including per handler) is listedcrow::App<RequestLogger, SecretContentGuard, RequestAppend> app;CROW_ROUTE(app, "/secret")// Enable SecretContentGu
)
