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module/test_drogon/main.cpp

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+#include <drogon/drogon.h>
+
+using namespace drogon;
+
+class GlobalMid : public HttpMiddleware<GlobalMid, false> {
+public:
+    void invoke(const HttpRequestPtr &req,
+                MiddlewareNextCallback &&next,
+                MiddlewareCallback &&done) override {
+
+        LOG_DEBUG << "进入全局中间件：" << req->path();
+        next([done](auto resp) {
+            resp->addHeader("X-Global", "Yes");
+            LOG_DEBUG << "离开全局中间件";
+            done(resp);
+        });
+    }
+};
+
+int main() {
+    app().registerMiddleware(std::make_shared<GlobalMid>());
+
+    app().registerHandler("/hello", [](const HttpRequestPtr &request,
+       std::function<void(const HttpResponsePtr &)> &&cb){
+        auto resp = HttpResponse::newHttpResponse();
+        resp->setBody("OK");
+        cb(resp);
+    }, {Get});
+
+    app().addListener("0.0.0.0", 80);
+    app().run();
+}