message: reactor.http: a convenience header insertion routine
diff: @@ -89,7 +89,15 @@ namespace elle
  /// @param content Content of the header.
  void
  header_add(std::string const& header, std::string const& content);
  - /// Remove a header previously set with .
  + /// Add a bunch of headers from a container of pairs
  + /// (header, content).
  + template <typename Headers_>
  + void
  + header_add(Headers_ const& h)
  + {
  + this->_headers.insert(h.begin(), h.end());
  + }
  + /// Remove a header previously set.
  ///
  /// @param name Name of the header to remove.
  void
  