Hello, world!

\");\n resp->setExpiredTime(0);\n callback(resp);\n}\n```\n\n**Most of the above programs can be automatically generated by the command line tool `drogon_ctl` provided by drogon** (The command is `drogon_ctl create controller TestCtrl`). All the user needs to do is add their own business logic. In the example, the controller returns a `Hello, world!` string when the client accesses the `http://ip/test` URL.\n\nFor JSON format response, we create the controller as follows:\n\n```c++\n/// The header file\n#pragma once\n#include \nusing namespace drogon;\nclass JsonCtrl : public drogon::HttpSimpleController\n{\n public:\n virtual void asyncHandleHttpRequest(const HttpRequestPtr &req, std::function &&callback) override;\n PATH_LIST_BEGIN\n //list path definitions here;\n PATH_ADD(\"/json\", Get);\n PATH_LIST_END\n};\n\n/// The source file\n#include \"JsonCtrl.h\"\nvoid JsonCtrl::asyncHandleHttpRequest(const HttpRequestPtr &req,\n std::function &&callback)\n{\n Json::Value ret;\n ret[\"message\"] = \"Hello, World!\";\n auto resp = HttpResponse::newHttpJsonResponse(ret);\n callback(resp);\n}\n```\n\nLet's go a step further and create a demo RESTful API with the HttpController class, as shown below (Omit the source file):\n\n```c++\n/// The header file\n#pragma once\n#include \nusing namespace drogon;\nnamespace api\n{\nnamespace v1\n{\nclass User : public drogon::HttpController\n{\n public:\n METHOD_LIST_BEGIN\n //use METHOD_ADD to add your custom processing function here;\n METHOD_ADD(User::getInfo, \"/{id}\", Get); //path is /api/v1/User/{arg1}\n METHOD_ADD(User::getDetailInfo, \"/{id}/detailinfo\", Get); //path is /api/v1/User/{arg1}/detailinfo\n METHOD_ADD(User::newUser, \"/{name}\", Post); //path is /api/v1/User/{arg1}\n METHOD_LIST_END\n //your declaration of processing function maybe like this:\n void getInfo(const HttpRequestPtr &req, std::function &&callback, int userId) const;\n void getDetailInfo(const HttpRequestPtr &req, std::function &&callback, int userId) const;\n void newUser(const HttpRequestPtr &req, std::function &&callback, std::string &&userName);\n public:\n User()\n {\n LOG_DEBUG << \"User constructor!\";\n }\n};\n} // namespace v1\n} // namespace api\n```\n\nAs you can see, users can use the `HttpController` to map paths and parameters at the same time. This is a very convenient way to create a RESTful API application.\n\nIn addition, you can also find that all handler interfaces are in asynchronous mode, where the response is returned by a callback object. This design is for performance reasons because in asynchronous mode the drogon application can handle a large number of concurrent requests with a small number of threads.\n\nAfter compiling all of the above source files, we get a very simple web application. This is a good start. **For more information, please visit the [wiki](https://github.com/an-tao/drogon/wiki/ENG-01-Overview) or [DocsForge](https://drogon.docsforge.com/master/overview/)**\n\n## Contributions\nEvery contribution is welcome. Please refer to the [contribution guidelines](CONTRIBUTING.md) for more information.\n","has_starred","hub_user","immutable_tags_settings",{"_76":11,"_77":78},"enabled","rules",[79],".*","is_automated","permissions",{"_83":17,"_84":11,"_85":11},"read","write","admin","user","storage_size",26948965136,"orgData","recentTags",[92,130],{"_93":45,"_94":95,"_96":97,"_98":99,"_100":101,"_102":103,"_51":119,"_120":95,"_121":29,"_122":57,"_39":123,"_124":125,"_126":110,"_127":119,"_128":66,"_129":17},"content_type","creator",5703810,"digest","sha256:6e6855f2fac69c394b574f23cde70e88a23f7453bc8a0be67d4c2e7c5f1e2fca","full_size",448032601,"id",49682340,"images",[104],{"_105":106,"_96":97,"_107":108,"_109":110,"_111":112,"_113":114,"_115":108,"_116":-5,"_117":99,"_63":66,"_118":-5},"architecture","amd64","features","","last_pulled","2026-09-21T03:43:01.930001707Z","last_pushed","2026-05-07T02:15:26.813688471Z","os","linux","os_features","os_version","size","variant","2026-05-07T02:15:27.087467Z","last_updater","last_updater_username","media_type","latest","repository",6813098,"tag_last_pulled","tag_last_pushed","tag_status","v2",{"_93":45,"_94":95,"_98":131,"_100":132,"_102":133,"_51":138,"_120":95,"_121":29,"_122":57,"_39":139,"_124":125,"_126":136,"_127":138,"_128":66,"_129":17},748531845,161673491,[134],{"_105":106,"_96":135,"_107":108,"_109":136,"_111":137,"_113":114,"_115":108,"_116":-5,"_117":131,"_63":66,"_118":-5},"sha256:010c27f200c965fc8dcd210c035bc52f290110c51fdbc426ee4f8c6c3f673202","2026-09-20T22:24:06.008385211Z","2021-08-13T04:24:35Z","2021-08-13T04:25:12.981442Z","qt5","sbxKitMetadata","isPotentialSpam","isHubSbxKitsEnabled","displaySecurityMetadata","tagAttestations","tagsHaveAttestations",[],"routes/_layout.r.$namespace.$reponame.tags",{"_34":149,"_157":158,"_145":171,"_172":11},{"_36":150,"_43":152,"_46":47,"_48":49,"_50":11,"_51":52,"_53":54,"_55":153,"_39":31,"_28":29,"_58":59,"_60":45,"_61":62,"_63":64,"_65":66,"_67":-5,"_68":69,"_70":71,"_72":11,"_73":29,"_74":154,"_80":11,"_81":156,"_86":29,"_87":88},[151],{"_39":40,"_41":42},[45],[57],{"_76":11,"_77":155},[79],{"_83":17,"_84":11,"_85":11},"tags",{"_159":160,"_161":-5,"_162":-5,"_163":164},"count",2,"next","previous","results",[165,168],{"_93":45,"_94":95,"_96":97,"_98":99,"_100":101,"_102":166,"_51":119,"_120":95,"_121":29,"_122":57,"_39":123,"_124":125,"_126":110,"_127":119,"_128":66,"_129":17},[167],{"_105":106,"_96":97,"_107":108,"_109":110,"_111":112,"_113":114,"_115":108,"_116":-5,"_117":99,"_63":66,"_118":-5},{"_93":45,"_94":95,"_98":131,"_100":132,"_102":169,"_51":138,"_120":95,"_121":29,"_122":57,"_39":139,"_124":125,"_126":136,"_127":138,"_128":66,"_129":17},[170],{"_105":106,"_96":135,"_107":108,"_109":136,"_111":137,"_113":114,"_115":108,"_116":-5,"_117":131,"_63":66,"_118":-5},[],"canDeleteTags","actionData","errors"]

drogonframework/drogon

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