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102 lines
3.0 KiB
Markdown
102 lines
3.0 KiB
Markdown
#
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<p align="center"><img src="assets/crowlogo.svg" width=600></p>
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<h4 align="center">A Fast and Easy to use microframework for the web.</h4>
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<p align="center">
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<a href="https://travis-ci.com/crowcpp/crow"><img src="https://travis-ci.com/crowcpp/crow.svg?branch=master" alt="Build Status"></a>
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<a href="https://coveralls.io/github/CrowCpp/crow?branch=master"><img src="https://coveralls.io/repos/github/CrowCpp/crow/badge.svg?branch=master" alt="Coverage Status"></a>
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<a href="https://crowcpp.github.io/crow"><img src="https://img.shields.io/badge/-Documentation-informational" alt="Documentation"></a>
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<a href="https://gitter.im/crowfork/community?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge"><img src="https://badges.gitter.im/crowfork/community.svg" alt="Gitter"></a>
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</p>
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## Description
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Crow is a C++ microframework for running web services. It uses routing similar to Python's Flask which makes it easy to use. It is also extremely fast, beating multiple existing C++ frameworks as well as non C++ frameworks.
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### Features
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- Easy Routing (similar to flask).
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- Type-safe Handlers.
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- Blazingly fast (see [this benchmark](https://github.com/ipkn/crow-benchmark) and [this benchmark](https://github.com/guteksan/REST-CPP-benchmark)).
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- Built in JSON support.
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- [Mustache](http://mustache.github.io/) based templating library (`crow::mustache`).
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- Header only library (single header file available).
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- Middleware support for extensions.
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- HTTP/1.1 and Websocket support.
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- Multi-part request and response support.
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- Uses modern C++ (11/14)
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### Still in development
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- [HTTP/2 support](https://github.com/crowcpp/crow/issues/8)
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## Documentation
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Available [here](https://crowcpp.github.io/crow).
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## Examples
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#### Hello World
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```c++
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#include "crow.h"
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int main()
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{
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crow::SimpleApp app;
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CROW_ROUTE(app, "/")([](){
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return "Hello world";
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});
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app.port(18080).multithreaded().run();
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}
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```
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#### JSON Response
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```cpp
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CROW_ROUTE(app, "/json")
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([]{
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crow::json::wvalue x;
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x["message"] = "Hello, World!";
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return x;
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});
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```
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#### Arguments
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```cpp
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CROW_ROUTE(app,"/hello/<int>")
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([](int count){
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if (count > 100)
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return crow::response(400);
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std::ostringstream os;
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os << count << " bottles of beer!";
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return crow::response(os.str());
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});
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```
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Handler arguments type check at compile time
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```cpp
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// Compile error with message "Handler type is mismatched with URL paramters"
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CROW_ROUTE(app,"/another/<int>")
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([](int a, int b){
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return crow::response(500);
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});
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```
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#### Handling JSON Requests
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```cpp
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CROW_ROUTE(app, "/add_json")
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.methods("POST"_method)
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([](const crow::request& req){
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auto x = crow::json::load(req.body);
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if (!x)
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return crow::response(400);
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int sum = x["a"].i()+x["b"].i();
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std::ostringstream os;
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os << sum;
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return crow::response{os.str()};
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});
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```
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More examples can be found [here](https://github.com/crowcpp/crow/tree/master/examples).
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## Setting Up / Building
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Available [here](https://crowcpp.github.io/crow/getting_started/setup).
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