Method encode

3rdparty/libprocess/src/encoder.hpp:151–229

    : DataEncoder(encode(response, request)) {}

  static std::string encode(
      const http::Response& response,
      const http::Request& request)
  {
    std::ostringstream out;

    // TODO(benh): Check version?

    out << "HTTP/1.1 " << response.status << "\r\n";

    auto headers = response.headers;

    // HTTP 1.1 requires the "Date" header. In the future once we
    // start checking the version (above) then we can conditionally
    // add this header, but for now, we always do.
    time_t rawtime;
    time(&rawtime);

    char date[256];

    tm tm_;
    PCHECK(os::gmtime_r(&rawtime, &tm_) != nullptr)
      << "Failed to convert the current time to a tm struct "
      << "using os::gmtime_r()";

    // TODO(benh): Check return code of strftime!
    strftime(date, 256, "%a, %d %b %Y %H:%M:%S GMT", &tm_);

    headers["Date"] = date;

    // Should we compress this response?
    std::string body = response.body;

    if (response.type == http::Response::BODY &&
        response.body.length() >= GZIP_MINIMUM_BODY_LENGTH &&
        !headers.contains("Content-Encoding") &&
        request.acceptsEncoding("gzip")) {
      Try<std::string> compressed = gzip::compress(body);
      if (compressed.isError()) {
        LOG(WARNING) << "Failed to gzip response body: " << compressed.error();
      } else {
        body = std::move(compressed.get());

        headers["Content-Length"] = stringify(body.length());
        headers["Content-Encoding"] = "gzip";
      }
    }

    foreachpair (const std::string& key, const std::string& value, headers) {
      out << key << ": " << value << "\r\n";
    }

    // Add a Content-Length header if the response is of type "none"
    // or "body" and no Content-Length header has been supplied.
    if (response.type == http::Response::NONE &&
        !headers.contains("Content-Length")) {
      out << "Content-Length: 0\r\n";
    } else if (response.type == http::Response::BODY &&