C++ client for making HTTP/REST requests
restclient-cpp Documentation

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This is a simple REST client for C++. It wraps libcurl for HTTP requests.


restclient-cpp provides two ways of interacting with REST endpoints. There is a simple one, which doesn't need you to configure an object to interact with an API. However the simple way doesn't provide a lot of configuration options either. So if you need more than just a simple HTTP call, you will probably want to check out the advanced usage.

Simple Usage

The simple API is just some static methods modeled after the most common HTTP verbs:

```cpp #include "restclient-cpp/restclient.h"

RestClient::Response r = RestClient::get("") RestClient::Response r = RestClient::post("", "text/json", "{\"foo": "bla"}") RestClient::Response r = RestClient::put("", "text/json", "{"foo": "bla"}") RestClient::Response r = RestClient::del("") RestClient::Response r = RestClient::head("") ```

The response is of type RestClient::Response and has three attributes:

```cpp RestClient::Response.code // HTTP response code RestClient::Response.body // HTTP response body RestClient::Response.headers // HTTP response headers ```

Advanced Usage

However if you want more sophisticated features like connection reuse, timeouts or authentication, there is also a different, more configurable way.

```cpp #include "restclient-cpp/connection.h" #include "restclient-cpp/restclient.h"

// initialize RestClient RestClient::init();

// get a connection object RestClient::Connection* conn = new RestClient::Connection("");

// configure basic auth conn->SetBasicAuth("WarMachine68", "WARMACHINEROX");

// set connection timeout to 5s conn->SetTimeout(5);

// set custom user agent // (this will result in the UA "foo/cool restclient-cpp/VERSION") conn->SetUserAgent("foo/cool");

// enable following of redirects (default is off) conn->FollowRedirects(true);

// set headers RestClient::HeaderFields headers; headers["Accept"] = "application/json"; conn->SetHeaders(headers)

// append additional headers conn->AppendHeader("X-MY-HEADER", "foo")

// if using a non-standard Certificate Authority (CA) trust file conn->SetCAInfoFilePath("/etc/custom-ca.crt")

RestClient::Response r = conn->get("/get") RestClient::Response r = conn->head("/get") RestClient::Response r = conn->del("/delete")

// set different content header for POST and PUT conn->AppendHeader("Content-Type", "text/json") RestClient::Response r = conn->post("/post", "{\"foo": "bla"}") RestClient::Response r = conn->put("/put", "text/json", "{"foo": "bla"}")

// deinit RestClient. After calling this you have to call RestClient::init() // again before you can use it RestClient::disable(); ```

The responses are again of type RestClient::Response and have three attributes:

```cpp RestClient::Response.code // HTTP response code RestClient::Response.body // HTTP response body RestClient::Response.headers // HTTP response headers ```

The connection object also provides a simple way to get some diagnostics and metrics information via conn->GetInfo(). The result is a RestClient::Connection::Info struct and looks like this:

```cpp typedef struct { std::string base_url; RestClients::HeaderFields headers; int timeout; struct { std::string username; std::string password; } basicAuth;

std::string certPath; std::string certType; std::string keyPath; std::string customUserAgent; struct { // total time of the last request in seconds Total time of previous // transfer. See CURLINFO_TOTAL_TIME int totalTime; // time spent in DNS lookup in seconds Time from start until name // resolving completed. See CURLINFO_NAMELOOKUP_TIME int nameLookupTime; // time it took until Time from start until remote host or proxy // completed. See CURLINFO_CONNECT_TIME int connectTime; // Time from start until SSL/SSH handshake completed. See // CURLINFO_APPCONNECT_TIME int appConnectTime; // Time from start until just before the transfer begins. See // CURLINFO_PRETRANSFER_TIME int preTransferTime; // Time from start until just when the first byte is received. See // CURLINFO_STARTTRANSFER_TIME int startTransferTime; // Time taken for all redirect steps before the final transfer. See // CURLINFO_REDIRECT_TIME int redirectTime; // number of redirects followed. See CURLINFO_REDIRECT_COUNT int redirectCount; } lastRequest; } Info; ```

Persistent connections/Keep-Alive

The connection object stores the curl easy handle in an instance variable and uses that for the lifetime of the object. This means curl will automatically reuse connections made with that handle.

Thread Safety

restclient-cpp leans heavily on libcurl as it aims to provide a thin wrapper around it. This means it adheres to the basic level of thread safety provided by libcurl. The RestClient::init() and RestClient::disable() methods basically correspond to curl_global_init and curl_global_cleanup and thus need to be called right at the beginning of your program and before shutdown respectively. These set up the environment and are not thread-safe. After that you can create connection objects in your threads. Do not share connection objects across threads as this would mean accessing curl handles from multiple threads at the same time which is not allowed.

In order to provide an easy to use API, the simple usage via the static methods implicitly calls the curl global functions and is therefore also not thread-safe.

HTTPS User Certificate

Simple wrapper functions are provided to allow clients to authenticate using certificates. Under the hood these wrappers set cURL options, e.g. CURLOPT_SSLCERT, using curl_easy_setopt. Note: currently libcurl compiled with gnutls (e.g. libcurl4-gnutls-dev on ubuntu) is buggy in that it returns a wrong error code when these options are set to invalid values.

```cpp // set CURLOPT_SSLCERT conn->SetCertPath(certPath); // set CURLOPT_SSLCERTTYPE conn->SetCertType(type); // set CURLOPT_SSLKEY conn->SetKeyPath(keyPath); ```



There are some packages available for Linux on packagecloud. And for OSX you can get it from the mrtazz/oss homebrew tap:

```bash brew tap mrtazz/oss brew install restclient-cpp ```

Otherwise you can do the regular autotools dance:

```bash ./ ./configure make install ```


All contributions are highly appreciated. This includes filing issues, updating documentation and writing code. Please take a look at the "contributing guidelines" before so your contribution can be merged as fast as possible.