/**
* sends a request to the local HTTP server
*
* @param http_stream open stream to send the request via
* @param resource name of the HTTP resource to request
* @param content_length bytes available in the response, if successful
*/
inline unsigned int sendRequest(tcp::iostream& http_stream,
const std::string& resource,
unsigned long& content_length)
{
const boost::regex regex_get_response_code("^HTTP/1\\.1\\s(\\d+)\\s.*");
const boost::regex regex_response_header("^[A-Za-z0-9_-]+:\\s.*");
const boost::regex regex_content_length_header("^Content-Length:\\s(\\d+).*", boost::regex::icase);
const boost::regex regex_response_end("^\\s*$");
// send HTTP request to the server
http_stream << "GET " << resource << " HTTP/1.1" << HTTPTypes::STRING_CRLF << HTTPTypes::STRING_CRLF;
http_stream.flush();
// receive response from the server
std::string rsp_line;
boost::smatch rx_matches;
unsigned int response_code = 0;
BOOST_REQUIRE(std::getline(http_stream, rsp_line));
BOOST_REQUIRE(boost::regex_match(rsp_line, rx_matches, regex_get_response_code));
BOOST_REQUIRE(rx_matches.size() == 2);
// extract response status code
response_code = boost::lexical_cast<unsigned int>(rx_matches[1]);
BOOST_REQUIRE(response_code != 0);
// read response headers
content_length = 0;
while (true) {
BOOST_REQUIRE(std::getline(http_stream, rsp_line));
// check for end of response headers (empty line)
if (boost::regex_match(rsp_line, rx_matches, regex_response_end))
break;
// check validity of response header
BOOST_REQUIRE(boost::regex_match(rsp_line, rx_matches, regex_response_header));
// check for content-length response header
if (boost::regex_match(rsp_line, rx_matches, regex_content_length_header)) {
if (rx_matches.size() == 2)
content_length = boost::lexical_cast<unsigned long>(rx_matches[1]);
}
}
return response_code;
}
