Recipe: Downloading and Posting data

Synchronous GET

HTTP GET a url say, https://github.com/sony/easyhttpcpp in a blocking manner and print the response status, header and the body as a string.

In case of large files, avoid using toString() method on the response body. Use getByteStream() to read data as a stream.

try {
    // create a default http client instance
    easyhttpcpp::EasyHttp::Ptr pHttpClient = easyhttpcpp::EasyHttp::Builder().build();

    // create a new request and execute synchronously
    easyhttpcpp::Request::Builder requestBuilder;
    easyhttpcpp::Request::Ptr pRequest = requestBuilder.setUrl("https://github.com/sony/easyhttpcpp").build();
    easyhttpcpp::Call::Ptr pCall = pHttpClient->newCall(pRequest);
    easyhttpcpp::Response::Ptr pResponse = pCall->execute();

    if (!pResponse->isSuccessful()) {
        std::cout << "HTTP GET Error: (" << pResponse->getCode() << ")" << std::endl;
    } else {
        std::cout << "HTTP GET Success!" << std::endl;
    }

    // print status
    std::cout << "Http status code: " << pResponse->getCode() << std::endl;
    std::cout << "Http status message: " << pResponse->getMessage() << std::endl;

    // print headers
    std::cout << "Http response headers:\n" << pResponse->getHeaders()->toString() << std::endl;

    // print body
    std::cout << "Http response body:\n" << pResponse->getBody()->toString() << std::endl;
} catch (const std::exception& e) {
    // maybe network error
    std::cout << "Error occurred: " << e.what() << std::endl;
}

Synchronous POST a string

HTTP POST a string to a server in a blocking manner and print the response status, header and the body as a string.

In case of bigger data or files, it is recommended to post data as a stream.

try {
    // create a default http client instance
    easyhttpcpp::EasyHttp::Ptr pHttpClient = easyhttpcpp::EasyHttp::Builder().build();

    // this becomes the Content-Type of the request
    easyhttpcpp::MediaType::Ptr pMediaType(new easyhttpcpp::MediaType("text/x-markdown; charset=utf-8"));

    // prep request body to post
    std::string requestBodyStr = "Hello World!";
    easyhttpcpp::RequestBody::Ptr pRequestBody = easyhttpcpp::RequestBody::create(pMediaType, requestBodyStr);
    
    // create a new request and execute synchronously
    easyhttpcpp::Request::Builder requestBuilder;
    easyhttpcpp::Request::Ptr pRequest = requestBuilder.setUrl("https://api.github.com/markdown/raw")
            .httpPost(pRequestBody).build();
    easyhttpcpp::Call::Ptr pCall = pHttpClient->newCall(pRequest);
    easyhttpcpp::Response::Ptr pResponse = pCall->execute();

    if (!pResponse->isSuccessful()) {
        std::cout << "HTTP GET Error: (" << pResponse->getCode() << ")" << std::endl;
    } else {
        std::cout << "HTTP GET Success!" << std::endl;
    }

    // print status
    std::cout << "Http status code: " << pResponse->getCode() << std::endl;
    std::cout << "Http status message: " << pResponse->getMessage() << std::endl;

    // print headers
    std::cout << "Http response headers:\n" << pResponse->getHeaders()->toString() << std::endl;

    // print body
    std::cout << "Http response body:\n" << pResponse->getBody()->toString() << std::endl;
} catch (const std::exception& e) {
    // maybe network error
    std::cout << "Error occurred: " << e.what() << std::endl;
}