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C++ Requests: Curl for People

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TLDR

C++ Requests is a simple wrapper around libcurl inspired by the excellent Python Requests project.

Despite its name, libcurl's easy interface is anything but, and making mistakes misusing it is a common source of error and frustration. Using the more expressive language facilities of C++11, this library captures the essence of making network calls into a few concise idioms.

Here's a quick GET request:

#include <cpr/cpr.h>

int main(int argc, char** argv) {
    cpr::Response r = cpr::Get(cpr::Url{"https://api.github.com/repos/whoshuu/cpr/contributors"},
                      cpr::Authentication{"user", "pass"},
                      cpr::Parameters{{"anon", "true"}, {"key", "value"}});
    r.status_code;                  // 200
    r.header["content-type"];       // application/json; charset=utf-8
    r.text;                         // JSON text string
}

And here's less functional, more complicated code, without cpr.

Documentation

Documentation
You can find the latest documentation here. It's a work in progress, but it should give you a better idea of how to use the library than the tests currently do.

Features

C++ Requests currently supports:

  • Custom headers
  • Url encoded parameters
  • Url encoded POST values
  • Multipart form POST upload
  • File POST upload
  • Basic authentication
  • Bearer authentication
  • Digest authentication
  • NTLM authentication
  • Connection and request timeout specification
  • Timeout for low speed connection
  • Asynchronous requests
  • 🍪 support!
  • Proxy support
  • Callback interfaces
  • PUT methods
  • DELETE methods
  • HEAD methods
  • OPTIONS methods
  • PATCH methods
  • Thread Safe access to libCurl
  • OpenSSL and WinSSL support for HTTPS requests

Planned

For a quick overview about the planed features, have a look at the next Milestones.

Usage

CMake

If you already have a CMake project you need to integrate C++ Requests with, the primary way is to use fetch_content. Add the following to your CMakeLists.txt.

include(FetchContent)
FetchContent_Declare(cpr GIT_REPOSITORY https://github.com/libcpr/cpr.git GIT_TAG f4622efcb59d84071ae11404ae61bd821c1c344b) # the commit hash for 1.6.2
FetchContent_MakeAvailable(cpr)

This will produce the target cpr::cpr which you can link against the typical way:

target_link_libraries(your_target_name PRIVATE cpr::cpr)

That should do it! There's no need to handle libcurl yourself. All dependencies are taken care of for you.

Packages for Linux Distributions

Alternatively, you may install a package specific to your Linux distribution. Since so few distributions currently have a package for cpr, most users will not be able to run your program with this approach.

Currently, we are aware of packages for the following distributions:

If there's no package for your distribution, try making one! If you do, and it is added to your distribution's repositories, please submit a pull request to add it to the list above. However, please only do this if you plan to actively maintain the package.

Requirements

The only explicit requirements are:

  • a C++11 compatible compiler such as Clang or GCC. The minimum required version of GCC is unknown, so if anyone has trouble building this library with a specific version of GCC, do let me know
  • If you would like to perform https requests OpenSSL and its development libraries are required.

Building cpr - Using vcpkg

You can download and install cpr using the vcpkg dependency manager:

git clone https://github.com/Microsoft/vcpkg.git
cd vcpkg
./bootstrap-vcpkg.sh
./vcpkg integrate install
./vcpkg install cpr

The cpr port in vcpkg is kept up to date by Microsoft team members and community contributors. If the version is out of date, please create an issue or pull request on the vcpkg repository.

Building cpr - Using Conan

You can download and install cpr using the Conan package manager. Setup your CMakeLists.txt (see Conan documentation on how to use MSBuild, Meson and others) like this:

project(myproject CXX)

add_executable(${PROJECT_NAME} main.cpp)

include(${CMAKE_BINARY_DIR}/conanbuildinfo.cmake) # Include Conan-generated file
conan_basic_setup(TARGETS) # Introduce Conan-generated targets

target_link_libraries(${PROJECT_NAME} CONAN_PKG::cpr)

Create conanfile.txt in your source dir:

[requires]
cpr/1.6.2

[generators]
cmake

Install and run Conan, then build your project as always:

pip install conan
mkdir build
cd build
conan install ../ --build=missing
cmake ../
cmake --build .

The cpr package in Conan is kept up to date by Conan contributors. If the version is out of date, please create an issue or pull request on the conan-center-index repository.


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