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162 lines
7.3 KiB
Markdown
162 lines
7.3 KiB
Markdown
# C++ Requests: Curl for People <img align="right" height="40" src="http://i.imgur.com/d9Xtyts.png">
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[](https://docs.libcpr.org/)
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[](https://gitter.im/libcpr/community?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge)
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## Announcements
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* Like you probably have noticed, `cpr` moved to a new home from https://github.com/whoshuu/cpr to https://github.com/libcpr/cpr. Read more [here](https://github.com/libcpr/cpr/issues/636).
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* This project is being maintained by [Fabian Sauter](https://github.com/com8) and [Kilian Traub](https://github.com/KingKili).
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* For quick help, and discussion libcpr also offer a [gitter](https://gitter.im/libcpr/community?utm_source=share-link&utm_medium=link&utm_campaign=share-link) chat.
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## TLDR
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C++ Requests is a simple wrapper around [libcurl](http://curl.haxx.se/libcurl) inspired by the excellent [Python Requests](https://github.com/kennethreitz/requests) project.
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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++17` (or `C++11` in case you use cpr < 1.10.0), this library captures the essence of making network calls into a few concise idioms.
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Here's a quick GET request:
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```c++
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#include <cpr/cpr.h>
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int main(int argc, char** argv) {
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cpr::Response r = cpr::Get(cpr::Url{"https://api.github.com/repos/whoshuu/cpr/contributors"},
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cpr::Authentication{"user", "pass", cpr::AuthMode::BASIC},
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cpr::Parameters{{"anon", "true"}, {"key", "value"}});
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r.status_code; // 200
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r.header["content-type"]; // application/json; charset=utf-8
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r.text; // JSON text string
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return 0;
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}
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```
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And here's [less functional, more complicated code, without cpr](https://gist.github.com/whoshuu/2dc858b8730079602044).
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## Documentation
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[](https://docs.libcpr.org/)
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You can find the latest documentation [here](https://docs.libcpr.org/). It's a work in progress, but it should give you a better idea of how to use the library than the [tests](https://github.com/libcpr/cpr/tree/master/test) currently do.
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## Features
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C++ Requests currently supports:
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* Custom headers
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* Url encoded parameters
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* Url encoded POST values
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* Multipart form POST upload
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* File POST upload
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* Basic authentication
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* Bearer authentication
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* Digest authentication
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* NTLM authentication
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* Connection and request timeout specification
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* Timeout for low speed connection
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* Asynchronous requests
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* :cookie: support!
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* Proxy support
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* Callback interfaces
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* PUT methods
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* DELETE methods
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* HEAD methods
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* OPTIONS methods
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* PATCH methods
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* Thread Safe access to [libCurl](https://curl.haxx.se/libcurl/c/threadsafe.html)
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* OpenSSL and WinSSL support for HTTPS requests
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## Planned
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For a quick overview about the planed features, have a look at the next [Milestones](https://github.com/libcpr/cpr/milestones).
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## Usage
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### CMake
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#### fetch_content:
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If you already have a CMake project you need to integrate C++ Requests with, the primary way is to use `fetch_content`.
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Add the following to your `CMakeLists.txt`.
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```cmake
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include(FetchContent)
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FetchContent_Declare(cpr GIT_REPOSITORY https://github.com/libcpr/cpr.git
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GIT_TAG 871ed52d350214a034f6ef8a3b8f51c5ce1bd400) # The commit hash for 1.9.0. Replace with the latest from: https://github.com/libcpr/cpr/releases
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FetchContent_MakeAvailable(cpr)
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```
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This will produce the target `cpr::cpr` which you can link against the typical way:
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```cmake
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target_link_libraries(your_target_name PRIVATE cpr::cpr)
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```
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That should do it!
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There's no need to handle `libcurl` yourself. All dependencies are taken care of for you.
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All of this can be found in an example [**here**](https://github.com/libcpr/example-cmake-fetch-content).
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#### find_package():
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If you prefer not to use `fetch_content`, you can download, build, and install the library and then use CMake `find_package()` function to integrate it into a project.
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**Note:** this feature is feasible only if CPR_USE_SYSTEM_CURL is set. (see [#645](https://github.com/libcpr/cpr/pull/645))
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```Bash
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$ git clone https://github.com/libcpr/cpr.git
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$ cd cpr && mkdir build && cd build
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$ cmake .. -DCPR_USE_SYSTEM_CURL=ON
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$ cmake --build .
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$ sudo cmake --install .
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```
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In your `CMakeLists.txt`:
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```cmake
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find_package(cpr REQUIRED)
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add_executable(your_target_name your_target_name.cpp)
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target_link_libraries(your_target_name PRIVATE cpr::cpr)
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```
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### Bazel
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Please refer to [hedronvision/bazel-make-cc-https-easy](https://github.com/hedronvision/bazel-make-cc-https-easy).
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### Packages for Linux Distributions
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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.
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Currently, we are aware of packages for the following distributions:
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* [Arch Linux (AUR)](https://aur.archlinux.org/packages/cpr)
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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.
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### NuGet Package
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For Windows, there is also a libcpr NuGet package available. Currently, x86 and x64 builds are supported with release and debug configuration.
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The package can be found here: [NuGet.org](https://www.nuget.org/packages/libcpr/)
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## Requirements
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The only explicit requirements are:
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* a `C++17` 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
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* in case you only have a `C++11` compatible compiler available, all versions below cpr 1.9.x are for you. With the upcoming release of cpr 1.10.0, we are switching to `C++17` as a requirement.
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* If you would like to perform https requests `OpenSSL` and its development libraries are required.
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## Building cpr - Using vcpkg
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You can download and install cpr using the [vcpkg](https://github.com/Microsoft/vcpkg) dependency manager:
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```Bash
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git clone https://github.com/Microsoft/vcpkg.git
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cd vcpkg
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./bootstrap-vcpkg.sh
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./vcpkg integrate install
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./vcpkg install cpr
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```
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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](https://github.com/Microsoft/vcpkg) on the vcpkg repository.
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## Building cpr - Using Conan
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You can download and install `cpr` using the [Conan](https://conan.io/) package manager. Setup your CMakeLists.txt (see [Conan documentation](https://docs.conan.io/en/latest/integrations/build_system.html) on how to use MSBuild, Meson and others).
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An example can be found [**here**](https://github.com/libcpr/example-cmake-conan).
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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](https://github.com/conan-io/conan-center-index) on the `conan-center-index` repository.
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