boost:asio. Download image file from server

I'm trying to save a image file (gif) from the response of a HTTP server, but the file is not saved correctly. I'm using the syncronous code example from the boost webpage, and I get a file, but is not the same file that you can see in a web browser. See original file here (WMS server): http://demo.lizardtech.com/lizardtech/iserv/ows?SERVICE=WMS&REQUEST=GetMap&LAYERS=LACounty,&STYLES=&BBOX=314980.5,3624089.5,443200.5,3861209.5&SRS=EPSG:26911&FORMAT=image/gif&HEIGHT=300&WIDTH=600 I tried different things, but no one is working. I get a file, but is not the same file. Do you know where/what is the problem? Thanks. ``` #include <fstream> #include <string> #include <boost/asio.hpp> using namespace std; using namespace boost::asio; using boost::asio::ip::tcp; void GetFile(const std::string& serverName, const std::string& getCommand, std::ofstream& outFile) { boost::asio::io_service io_service; // Get a list of endpoints corresponding to the server name. tcp::resolver resolver(io_service); tcp::resolver::query query(serverName, "http"); tcp::resolver::iterator endpoint_iterator = resolver.resolve(query); tcp::resolver::iterator end; // Try each endpoint until we successfully establish a connection. tcp::socket socket(io_service); boost::system::error_code error = boost::asio::error::host_not_found; while (error && endpoint_iterator != end) { socket.close(); socket.connect(*endpoint_iterator++, error); } boost::asio::streambuf request; std::ostream request_stream(&request); request_stream << "GET " << getCommand << " HTTP/1.0\r\n"; request_stream << "Host: " << serverName << "\r\n"; request_stream << "Accept: */*\r\n"; request_stream << "Connection: close\r\n\r\n"; // Send the request. boost::asio::write(socket, request); // Read the response status line. boost::asio::streambuf response; boost::asio::read_until(socket, response, "\r\n"); // Check that response is OK. std::istream response_stream(&response); std::string http_version; response_stream >> http_version; unsigned int status_code; response_stream >> status_code; std::string status_message; std::getline(response_stream, status_message); // Read the response headers, which are terminated by a blank line. boost::asio::read_until(socket, response, "\r\n\r\n"); // Process the response headers. std::string header; while (std::getline(response_stream, header) && header != "\r") { } // Write whatever content we already have to output. if (response.size() > 0) { outFile << &response; } // Read until EOF, writing data to output as we go. while (boost::asio::read(socket, response, boost::asio::transfer_at_least(1), error)) { outFile << &response; } } int main(int argc, char* argv[]) { string serverName = "demo.lizardtech.com"; string getCommand = "/lizardtech/iserv/ows?SERVICE=WMS&REQUEST=GetMap&"; getCommand += "LAYERS=LACounty,&STYLES=&"; getCommand += "BBOX=314980.5,3624089.5,443200.5,3861209.5&"; getCommand += "SRS=EPSG:26911&FORMAT=image/gif&HEIGHT=300&WIDTH=600"; std::ofstream outFile("image.gif", std::ofstream::out, std::ofstream::binary); GetFile(serverName, getCommand, outFile); outFile.close(); return 0; } ```