ifstream file("C:\\image.jpg");

    file.seekg(0,ios::end);
    int size=file.tellg();
    file.seekg(0,ios::beg);
    file.clear();
    char cont[size];
    file.read(cont,size);
    string bodyReq="file=";

    for(int i=0;i<size;i++)
    {
        bodyReq.push_back(cont[i]);
    }
    bodyReq.append(cont);
    cout<<bodyReq.length()<<endl;

    sf::Http http;
    http.setHost("http://localhost/");
    sf::Http::Request request;
    request.setUri("images/index.php");
    request.setMethod(sf::Http::Request::Post);
    request.setField("Content-Type", "application/x-www-form-urlencoded");
    request.setBody(bodyReq);
    sf::Http::Response response=http.sendRequest(request);
    if(response.getStatus()==sf::Http::Response::Ok)
    {
        cout<<response.getBody();
        cin.get();
    }
    else
    {
        cout<<"error "<<response.getStatus()<<endl;
        cin.get();
    }